Kenwood KR-3200 receiver

 Kenwood KR-3200

FM/AM Stereo Receiver

Stereo Sophistication for Music Lovers on a Budget

For a stereo receiver with audiophile sophistication at a moderate price, look no farther than the Kenwood KR-3200. This remarkable unit delivers ample power to drive two sets of stereo speakers. It provides a control center for a complete stereo system, including Phono, Auxiliary and Tape Deck. It also incorporates many of the same fine features found on Kenwood’s far more expensive units, to give you operating convenience and flexibility. Like all fine Kenwood products, the KR-3200 reflects Kenwood's meticulous engineering and stringent quality control in its high performance level and extraordinary dependability. In every respect, the Kr-3200 proves itself a remarkable stereo value.

Newly-Developed DSD Circuitry – Kenwood’s exclusive Double-Switching Demodulator in the MPX circuit appreciably improves stereo separation. A new block filter design efficiently reduces beat interference and intermodulation distortion due to carrier leakage, greatly improving FM de-emphasis characteristics.

Super Low-Noise Preamplifier – Kenwood incorporates new PNP silicon low-noise transistors in the preamp stage to assure low-noise performance and circuit reliability.

Power Amplifier Section – The KR-3200 boasts a wide frequency response with exceptional flatness to deliver stereo reproduction on the highest fidelity. Damping factor is excellent, especially at the lower frequencies.

Linear Frequency Dial Scale – Because the KR-3200 employs a linear frequency variable capacitor, the FM dial scale is equally graduated from 88 to 108 MHz, allowing quick, accurate tuning from one end of the dial to the other.

Large, Luminous Tuning Meter – An extra-large, bright Signal Strength Meter provides an easy read-out of optimum reception point for easy tuning accuracy.

One-Touch Speaker Terminals – Connecting the two sets of stereo speakers is as easy as pushing a button with these newly-designed, short-circuit-proof speaker connectors.

Step-Type Tone Controls – Precise and resettable tonal balance can be achieved by means of Bass and Treble Tone Controls calibrated in 2 dB increments from +10 dB to -10 dB

Other Features – Loudness Control; Noise Filter; Tape Monitor; Front Panel Headphone Jack; 300 and 75 ohm antenna impedance

Specifications

FM Tuner Section

Sensitivity (IHF):  2,3 µV 

Quieting Slope:  48 dB  at 5 µV ; 60 dB  at 10 µV ; 63 dB  at 50 µV 

Signal-to-Noise-Ratio:  63 dB 

Capture  Ratio (IHF):  3,5 dB 

Selectivity  Ail. Ch (IHF):  50 dB 

Frequency Response:  20 – 15,000 Hz (+0,5 -2,0 dB)

Stereo Separation:  53 dB at 1 kHz; 20 dB at 10 kHz

Total harmonic Distortion: (at 400 Hz, 100% Mod.)

Mono :  0,5%

Stereo :  0,9%

Image Rejection:  60 dB 

IF Rejection:  90 dB 

Harmonic Spurious Rejection:  80 dB 

AM Suppression:  60 dB 

Sub-Carrier-Suppression:  45 dB 

Antenna Impedance:  300 Ω  and 75 Ω 

AM Tuner Section

Sensitivity (IHF):  24 µV 

Signal-to-Noise-Ratio:  45 dB at 1 mV input

selectivity (IHF):  30 dB 

image Rejection Ratio:  45 dB 

IF Rejection:  35 dB  

Antenna:  Built-in ferrite bar antenna, External antenna terminals

Amplifier Section

Continuous Power Output (RMS)

Both Channels Driven Simultaneously

27 watts (13,5 + 13,5) at 8 Ω  from 50 Hz – 20 kHz

34 watts (17 +17) at 8 Ω  1 kHz 

40 watts (20 + 20) at 4 Ω  1 kHz 

Each Channel Driven

24/24 watts at 4 Ω at 1 kHz 

18,5/18,5 watts at 8 Ω  at 1 kHz 

Dynamic Power Output (IHF)

Both Channels Driven

60 watts at 4 Ω 

42 watts at 8 Ω 

Total harmonic Distortion: 

Less than 1,3% at rated output

Less than 0,2% at -3 db

Intermodulation Distortion:

Less than 1,3% at rated output

Less than 0,2% at -3 dB 

Frequency Response: 

High Level Input:  25 – 35,000 Hz (±2 dB)

Power Bandwidth (IHF):  25 – 25,000 Hz

Input Sensitivity/Impedance

Phono :  3 mV/50 k Ω 

Aux :  180 mV/30 k Ω 

Tape Play :  200 mV/45 k Ω 

Hum and Noise

Phono :  63 dB 

Aux :  75 dB 

Tape Play :  75 dB 

Output Voltage

Tape Rec :  180 mV

DIN Connector :  30 mV

Tone Controls

Bass :  ±10 dB  at 100 Hz 

Treble :  ±10 dB  at 10 kHz 

Loudness Control:

± 10 dB  at 100 Hz 

+0 dB  at 10 kHz 

Noise Filter: -10 dB  at 10 kHz 

Damping Factor (8 Ω ):  50

Speaker Impedance:  4 to 16 Ω 

General

Switches

Speakers:  Off, A, B, A + B

Selector:  AM, FM, Phono, Aux,

Mode:  Mono-Stereo

Others:  Tape Monitor, Noise Filter, Loudness

AC Outlets:  1 switched, 1 unstitched

Power Voltage:  110 – 120 V AC, 50/60 Hz 

Power Consumption:  85 watts at full power; 20 watts at no signal

Dimensions (W x H x D):  17-1/8” x 5-3/4” x 13-5/8”

Weight:  18 lbs

JVC JT-V11 tuner

Here’s a new JVC high-fidelity tuner to make an ideal mate for any of the JA-S stereo integrated amplifiers, particularly the JA-S11. Add a turntable and pair of speaker systems and your audio system is ready to move you into an exciting musical adventures. Among the many first-class features of this well-built model are its big twin tuning meters.

Wide 240 mm Tuning Dial

we are able to equip our tuners with wide tuning dials because our tuning mechanisms are precision designed to guarantee accurate station indication and a smooth “feel” . JVC knows how important easy-to-read dials can be to your radio listening pleasure. So we’ve made extra sure that the 240 mm (9-7/16”) wide dial on the JT-V11 is accurately calibrated and that the heavy flywheel/tuning knob mechanism offers a good feel as well.

Twin Tuning Meters

station selection is quick and easy because this unit is equipped with two meters – one for signal strength and the other for centre of channel in FM. Both are very large and well illuminated. For accuracy, they feature tested circuits, so that you’ll never be fooled by false indication.

Switch

One switch does it all. We’ve combined the FM Muting function with the mono-auto FM selector for user convenience. Setting the switch to FM Auto automatically engages the FM muting circuit to end inter-station noise you hear while tuning a station. Stations with weak signals and little hi-fi quality are effectively cut out; you only hear FM stations with sufficient hi-fi parameters.

Dependable Electronics

We’ve employed the best of our electronics techniques in designing the JT-V11. A total of three high-integration ICs – one each for FN IF, FM MPX (Multiplex) and AM  - are employed. Total circuit dependability is the key advantage of this IC construction. Additionally a PLL (Phase Locked Loop) FM MPX is used for wide stereo separation. Then, an FM IF Filter – a new 4-resonator single-unit ceramic filter – that improves selectivity and hi-fi specifications.

 

Specifications

FM Tuner Section

Tuning Range:  88 MHz – 108 MHz

Usable Sensitivity (IHF):  1,9 µV 

Sensitivity for 50 dB  S/N (Stereo):  40 µV 

Distortion

Mono : 0,2% (1 kHz )

Stereo :  0,4% (1 kHz )

Signal-to-Noise-Ratio: 

Mono  :  72 dB 

Stereo  :  50 dB 

Selectivity:  60 dB 

Capture Ratio:  1,0 dB 

IF Rejection:  90 dB 

Stereo Separation:  35 dB (at 100 Hz); 40 dB  (at 1 kHz); 30 dB  (at 10 kHz)

Frequency Response:  30 Hz  – 12 kHz +0,5 dB , -2,5 dB 

Output Level:  650 mV  (400 Hz, 100% Mod.)

AM Tuner Section

Tuning Range:  525 kHz – 1605 kHz

Usable Sensitivity:  300 µV/m (Bar antenna); 50 µV  (External antenna)

Signal-to-Noise-Ratio:  50 dB 

Distortion :  0,5%

Selectivity :  30 db

General

Dimensions (W x H x D):  390 x 152 x 358 mm (15-11/32” x 6” x 14-3/32”)

Weight:  5 kg (11 lbs)

 

JVC A-X2 amplifier

Super-A Integrated Amplifier

For years, audiophiles have praised the purity, depth and naturalness of Class-A amplifiers.

But they haven't been wild about the heat, weight, power limitations and high cost that go hand-in-hand with Class-A's low efficiency and high idling currents. That's why Class-A has remained a rare, esoteric design chosen by the few who were willing to pay for its fidelity and put up with its limitations.

JVC Super-A design brings together the purity of Class-A and the efficiency of the more common Class-AB. By eliminating most of  the measurable switching and crossover distortion. Super-A achieves the kind of sound that has distinguished Class-A designs of the past.

At the same time, Super-A is as efficient as Class-AB, so there are no heat and weight problems which also drive up the cost of conventional Class-A. and JVC Super-A amplifiers have no transient intermodulation distortion (TI) thanks to very wide bandwidth capabilities. What's more, the A-X2 Zsuper-A amplifier shown here includes a 5-band graphic equalizer for both normal playback and recording EQ. LED power meters, "direct power supply" which yields high damping factor at all frequencies, and JVC's Triple Power protection system.

All this comes with plenty of power behind it; 40 watts per channel continuous (RMS) power into 8 ohms, from 20 to 20,000 Hz, with no  more than 0,007% Total Harmonic Distortion:.

Specifications

Output Power (Both channel driven):  

40 watts per channel, min. RMS into 8 ohms, from 20 to 20,000 Hz, with no  more than 0,007% Total harmonic Distortion

42 watts per channel into 8 ohms at 1 kHz

Total Harmonic Distortion:: 

 0,007% at rated output, from 20 - 20,000 Hz, 8 Ω

0,003% at rated output at 1 kHz, 8 Ω

Intermodulation Distortion:  0,007% at Rated output,, * Ω

Power Bandwidth:  10 Hz - 30 kHz (IHF, both channels driven, 8 Ω, 0,02% Total harmonic Distortion:.)

Frequency Response:  10 Hz - 100 kHz +0 -3 dB

Damping Factor:  50 (1 kHz, 8 Ω)

Tone Controls:  S.E.A.

Center Frequency:  40; 250; 1 k; 5 k; 15 kHz

Control Range:  ±12 dB

Input Sensitivity/Impedance

Phono :  2,5 mV/47 kΩ

Tuner, Tape, Aux ;  150 mV/40 kΩ

Rec. Output Level:  150 mV

Phono EQ. Deviation:  ±0.5 dB (20 Hz - 15 kHz)

Phono Overload:  150 mV (1 kHz)

Signal-to-Noise-Ratio:

Phono :  73 dB (new IHF)

Tuner, Tape, Aux :  77 dB (new IHF)

Loudness Control (Volume Control at -30 dB position):  +6db at 100 Hz; +4 dB at 10 kHz

Dimensions (W x H x D):  420 x 120 x 329 mm (16-1/2" x 4-11/16" x 12-5/16")

Weight:  6,6 kg (14,6 lbs)

Akai X-200D reel-to-reel

 Three motors Auto-reverse custom deck

Model X-200D - this smartly designed three motors, Auto-reverse custom deck offers you superb stereo hi-fi tape recording and automatic reverse playback.

Outstanding Features:

4-track stereo/monaural recording and playback. For playback, the X-200D requires an external power amplifier and speakers

3 speeds - 1-7/8; 3-3/4; and 7-1/2 ips

3 heads - Erase, Recording/Playback and bias heads. Cross-field head System

3 motors - A hysteresis synchronous 3-speed motor for capstan drive. Two 6-pole eddy current out-rotor motors for supply and take-up reel drive

Wide Cross-field frequency response

Solid state pre-amplifier with two integrated circuits

Sensing tape continuous reverse [Auto, reverse]

Manual revers

Shield type head for high Signal-to-Noise-Ratio:

Two lever system ensures dependable and durable operation

Track selector for simple selection between stereo and monaural

Slide-type record level controls

100 kHz biased for FM multiplex recording

Automatic stop/shut off, Instant stop control with start button

Automatic pinch wheel release

Tape speed equalizer

Tape lifter in fast forward and rewind operation

DIN jack with selector switch for High/Low input

Stereo headphone jack

4-digit index counter with reset button. Twin type VU meter with record indicator lamp

Fine oil-finished wooden cabinet

Universal voltage selector [from 100V to 240V. 50/60 Hz]

Cross-Field Head

On conventional recorders the signal and bias are applied to the same recording head. Therefore the frequencies recorded, especially the high frequency component of the recorded signal tend to be attenuated or erased by the effect of the bias field.

On the exclusive Akai Cross-Field Head which was developed by Akai for practical use the signal and bias heads are mounted in opposition with their centers slightly off. As the recorded signal is entirely unaffected by the prevailing effect of the bias field, the tape can be recorded over the entire frequency spectrum with maximum fidelity.

Sensing Tape Continuous Reverse

Automatic reverse with metallic sensing tape is used for playback only. Reverse operation will occur when metallic sensing tape on pre-recorded tape makes contact with the Sensing Pin. Put metallic sensing tape at the desired reverse point on shiny side of the pre-recorded tape and another metallic sensing tape at the desired reverse point on dull side of the pre-recorded tape. The X-200D will then give continuous playback in both directions between two points.

Manual Reverse

The X-200D may be manually reversed by pushing the Reverse Buttons.

Solid State Pre-Amplifier with Two Integrated Circuits

X-200D’s solid state pre-amplifier uses special two Integrated Circuits developed by Akai

Specifications

Tape Speeds :  1-7/8; 3-3/4 and 7-1/2 ips

Max. reel Size:  7” reel

Fast Forward and Rewind Time

75 seconds for 1,200 ft. tape at 50 Hz

60 seconds for 1,200 ft. tape at 60 Hz

Motors : 

Hysteresis synchronous 3-speed motor for capstan drive.

Two out-rotor motors for supply and take-up reel drive

Heads :  Record/Playback Head:  Erase and Bias heads

Wow and Flutter: 

7-1/2 ips :  less than 0,08% RMS

3-3/4 ips :  less than 0,12% RMS

1-7/8 ips : less than 0,20% RMS

Frequency Response:

7-1/2 ips :  30 – 20,000 Hz  ±3 dB 

3-3/4 ips :  30 – 19,000 Hz  ±3 dB 

1-7/8 ips :  30 – 9,000 Hz  ±3 dB 

Signal-to-Noise-Ratio: :  better than 50 dB 

Total harmonic Distortion: :  within 2% at 1,000 Hz  0 VU recording

Input Level

Mic :  better than 0,5 mV 

Line :  better than 50 mV 

DIN :  better than 5 mV  (Low), >50 mV  (High)

Output Level

Line :   VU (1,23 V)

DIN :  0,4 V

Equalization:  Correct equalization for playback of tapes recorded to the NAB curve

Recording Bias Frequency:  100 kHz 

Recording Level Indicator:  Twin type VU meter

Recording System:  4-track stereo/monaural Cross-Field bias system

Semiconductors:  14 Transistors ; 2 ICs ;

Power Supply:  AC 100 to 240 V, 50/60 Hz

Power Consumption:  8 - 90 VA

Dimensions (W x H x D):  358 x 358 x 227 mm (14” x 14” x 8-7/8”)

Weight:  17 kg (37,4 lbs)

Akai 1710W reel-to-reel

Akai 1710W Mignon Stereo Tape Recorder

Creating a delightful mood of stereo music around you

New compact style with oil-finished wooden cabinet complements your hi-fi set or other furniture

Rugged construction assures trouble-free operation

Tape cleaner keeps tape and heads free of dust and Oxide powder, and prevents annoying tape squeak.

Outstanding features

4-track stereo/monaural recording and playback

3 Speed, 1-7/8; 3-3/4 and 7-1/2 ips (15 ips optimal)

Shield type head for high s/n

Two lever system ensures dependable and durable operation

Track selector for simple selection between stereo and monaural

Automatic shut off

Instant stop control

Tape cleaner

Tone controls

Speaker switch

Tape lifter in fast forward and rewind operation

4 hours maximum stereo recording capacity with a 1,200 foot tape

Two built in 5” x 7” speakers

DIN jack, Stereo headphone jack

3-digit index counter with reset button, 2 VU meters

One piece front panel and fine oil-finished wooden cabinet

Vertical and horizontal operation

Universal voltage selector (from 100 V to 240 V, 50  or 60 Hz)

 

Specifications

Tape Speed :  1-7/8; 3-3/4 and 7-1/2 ips

Tape Speed Deviation:  within ±3% at all tape speeds

Fast Forward and Rewind Time

150 seconds for 1,200 ft. tape at 50 Hz

120 seconds for 1,200 ft. tape at 60 Hz

Monitor System:  Can be monitored the program being recorded by using a stereo headphone

Motor:  Condenser starting induction two-speed motor

Horse Power:  1/100 HP

Power Ratio:  70%

Revolution

2,900 to 1,450 rpm at 50 Hz

3,480 to 1,740 rpm at 60 Hz

Reels Used:  7” – 5” – 3” reels

Heads

 Rec/Play Head:  Inline 4-track stereo/monaural

Gap :  4/1000 mm

Impedance:  3,600 Ω  at 1,000 Hz

Erase Head:  Inline 4-track stereo

Gape:  0,1 mm

Impedance:  3,6000 Ω  at 90 kHz

 Record Level Indicator:  Vertical indication model “A” VU meter

Wow and Flutter: 

7-1/2 ips :  less than 0,18% RMS

3-3/4 ips :  less than 0,25% RMS

1-7/8 ips : less than 0,35% RMS

Frequency Response:

7-1/2 ips :  40 – 15,000 Hz  ±3 dB 

3-3/4 ips :  40 – 12,000 Hz  ±3 dB 

1-7/8 ips :  40 – 6,000 Hz  ±3 dB 

Signal-to-Noise-Ratio:   better than 50 dB 

Total harmonic Distortion:   within 3% at 1,000 Hz  0 VU recording

Crosstalk : 

Monaural :  less than -55 dB 

Stereo :  less than -43 dB 

Erase Ratio:  less than  -70 dB 

Insulation Resistance:  better than  50 M Ω 

Insulation Durability:  1,000 V, AC for more than one minute duration

Line Output:  2,5 V at volume maximum (250 Hz, 0 VU recorded tape used)

Impedance:  82 k Ω 

Main Output:  4 W at music power per each channel total 8 W

Impedance:  8 Ω  

DIN Output:  2,5 V at Volume maximum

Impedance:  82 k Ω 

Line Input:  150 mV

Impedance: 130 k Ω 

Mic Input:  3 mV

Impedance:  30 k Ω 

DIN Input:  20 mV

Impedance:  36 k Ω 

Recording System:  In-line 4-track stereo, monaural recording

Playback System:  In-line 4-track stereo, monaural playback

Transitor Used:  2SC650 (x2); 2SC-458LG [C, D] (x2)

Tube Used:  12AT7 (x1); 6AR5 (x2); 6CA4 (x1)

Germanium Used:  IN-34A (x2)

Power Supply:  AC 100 to 240 V, 50/60 Hz

Power Consumption:  80 VA

Dimensions (W x H x D):  345 x 360 x 190 mm (13-1/2” x 14” x 7-1/2”)

Weight:  15 kg (33 lbs)

 

Jensen SG-300 Sigma speaker

 Jensen brings you an advanced 12" version of the famous Triaxial loudspeaker

Many years ago Jensen introduced the G-610 Triaxial 3-way loudspeaker, three acoustically and electronically independent loudspeakers in one unitary assembly. It made history as the first 3-way system and embodied the first horn-loaded compression driver supertweeter to be used in a commercial high fidelity loudspeaker. When this 15" speaker was installed in a large enclosure,, the sound was truly awe inspiring.

Now Jensen has created the SG-300 Triax® . It is scaled down in dimensions and will go in a compact shelf-size enclosure. It retains all of the important original concepts, is even more advanced in its use of the Flexair® high-compliance long-travel surround and Syntox-6 magnetic structure in the woofer. 

The Jensen Sigma Series  of  high fidelity unitary loudspeakers offers a comprehensive range of six 12" and three 8" models to suit most every unitary application. This brilliant Series of loudspeakers embodies every advance in acoustic design, every wanted feature of convenience, performance and high reliability.

SG-300 Triax® 12" 3-way unitary loudspeaker

Jensen's newest exclusive, a true 3-way 12" unitary hi-fi speaker. The Flexair® woofer and Syntox-6® magnet structure produce rock-bottom bass to 20 Hz. A low-distortion compression midrange uses the woofer cone as its horn mouth. The cast support bar contains a new horn-loaded compression super-tweeter which delivers response well past 20 kHz. 

Specifications:

Nominal Size:  12”

Power Rating:  30 watts

Frequency Range:  20 – 20,000 Hz

Impedance:  8 ohm

Crossover:  600 Hz, 4000 Hz

Balance Control:  Mid/High Frequency

Woofer Resonance:  25 Hz

Dimensions:  12-3/8” diameter;  8-1/8 deep

Connections:  Push Type Binding post

Weight:  15 lbs (shipping)

Jensen HS-2 headphones

 Jensen HS-2

These unique stereo headphones bring an exciting new dimension to your favorite mono or stereo recordings. You’ll marvel at the smooth, full range, undistorted output.

comfortable to wear, easy to listen to.

Soft foam cushions provide feather weight comfort and preserve the undistorted bass response without pressure. Add pleasure to your personal stereo listening.

Jensen Model HS-2 Stereo Headphones bring an exciting new dimension to your favorite recordings. Unusually smooth full range undistorted output set these headphones apart. Soft foam cushions provide feather weight comfort and preserve the undistorted bass response without pressure. Response is true, complete, distortion-free from below 20 to 17,000 cycles.

HS-2 Stereo Headphones may be connected to any stereo or mono system. A full 8-foot input cable is conveniently located to the rear of the left phone. Of course, it carries the Jensen 5 year hi-fi guarantee. Suggested resale price $24,95.

Specifications

Drivers:  High-Compliance, Maisture resistant diaphragm

Frequency Range:  Below 20 Hz to 17,000 Hz

Power Requirements:  comfortable listening with 1 milliwatt; loud listening with 10 milliwatts

Impedance:  4 Ω  each channel (may be connected to 4- , 8- , or 16- Ω  amplifier outputs)

Terminals:  Standard 3-conductor headphone plug

Cord:  8’ long

Weight:  16 oz (Net); 2 lbs (Shipping)

Yamaha P-1250 monaural power amp

Yamaha P-series Professional Power Amplifiers P1250 

The power amplifier shall have an input sensitivity of +4 dBn, requiring no more than 1,23 volts RMS to be driven to rated output into a 4 ohm load. The maximum continuous average sine wave power output over a 20 Hz to 20 kHz bandwidth for a single channel shall be (150 watts, 250 watts) onto a minimum 4 ohm load impedance, or (100 watts, 170 watts) into an 8 ohm load with no more than 0,05% thd.

Total harmonic Distortion measured at half rated power, from 20 Hz to 20 kHz, shall be no more than 0,01% . maximum intermodulation distortion, measured using the SMPTE method of 60 Hz and 7 kHz tones mixed in a 4:1 ratio, shall be no more than 0,01% measured at rated power output. Power bandwidth shall be no less than 10 Hz to 50 kHz at half rated power output, and frequency response shall be +0 dB, -1 dB from 10 Hz to 50 kHz. s/n as established by comparing the maximum output with signal to the minimum output noise with a shorted input, shall be no less than 110 dB measured with a -6 dB/octave low pass filter at 12,47 kHz (equal to a “brick wall” filter at 20 kHz), and no less than 115 dB measured with an IHF “A” weighting network. Residual output noise, measured with the input attenuator set at infinite attenuation, shall be no more than _80 dBm with a -6 dB/octave low pass filter at 12,47 kHz, or no more than -90 dBm with an IHF “A” weighting network. Slew rate shall be at least 50 volts per microsecond, full swing.

The amplifier input(s) shall be equipped with both an XLR-3 type connector and a pair of Tip/Ring/Sleeve ¼-inch phone jacks, wired in parallel. The input shall be of the electronically balanced, differential type, with an input impedance of no less than 15 k ohm presented to either balanced or unbalanced sources. The amplifier output(s) shall be equipped with a set of 5-way binding posts for positive, high-current connections, and with parallel-wired Tip/Sleeve 1-4-inch phone jacks for wiring convenience.

Input level shall be adjustable by means of (one or two) detented input attenuator(s) calibrated in 32 steps of from zero to infinite attenuation. The attenuator(s) shall be recessed, and shall be designed so as to be easily adjustable by hand, without any tools. To avoid casual or accidental setting changes, a security cover for the attenuator(s) shall also be provided.

Protection for the speaker load shall be established by means of an output-disconnect relay that is timed out when power is first applied to avoid transients from reaching the load, and that immediately disconnects the load and turns on a front-panel protection indicator in the event that more than 2 volts DC appears across the output. Further protection for the amplifier and load shall be provided by VI limiting circuitry which automatically reduces the power output in the event the load impedance is below 2 ohm for a single channel, (4 ohm for a dual-channel model in bridged mono configuration). The amplifier shall also include a full-time 2-speed fan which operates at high speed under severe thermal stress, and automatically resets to a lower speed as appropriate. Cooling air shall be drawn through a removable cleanable front-panel filter, and exhausted via ports in the tip and side panels of the amplifier.

Signal level indication (per each channel on dual-channel models) shall be provided by two LEDs, one of which turns on when the output THD is equal to or above 1%, which would indicate the onset of clipping, and one which turns on when the output level is equal to or greater than 2 volts RMS, which would indicate the presence of program signal.

Specifications P1250

Power Output Level (THD =0,05%)

20 Hz – 20 kHz :  170 W (at 8 Ω ); 250 W (at 4 Ω )

1 kHz:  185 W (at 8 Ω ); 265 W (at 4 Ω )

Frequency Response:   10 Hz – 50,000 Hz (8 Ω ) +0 -1 dB

Power Bandwidth (THD = 0,1%)

10 Hz to 100,000 Hz (85 W) at 8 ohm

10 Hz to 100,000 Hz (125 W) at 4 ohm

Total harmonic Distortion: 

Less than 0,007% ( 85 W, 20 Hz – 20 kHz, 8 Ω )

Less than 0,003% ( 85 W, 1 kHz, 8 Ω )

Less than 0,005% ( 125 W, 1 kHz, 4 Ω )

Less than 0,01% ( 1255 W, 20 Hz – 20 kHz, 4 Ω )

Intermodulation  Distortion (60 Hz : 7 kHz = 4:1)

less than 0,005% (85 W, 8 Ω )

less than 0,01% (125 W, 4 Ω )

Damping Factor

Better than 110 (1 kHz , 8 Ω ); >55 (1 kHz  , 4 Ω  )

Signal-to-Noise-Ratio: 

Better than 110 dB (Input Short; 12,47 kHz , -6 dB/octave LPF)

Better than 115 dB (Input Short, IHF A Network)

Slew Rate

± 50 V/µsec (8 Ω , Full Swing)

Sensitivity :  +4 dB (1,23 V rms) for nominal output (4 Ω  load)

Voltage Gain:  28,3 dB

Input Impedance:  better than  15 k Ω , Balanced or Unbalanced (Att. Max)

Residual Noise (Input Att. Minimum)

Less than -80 dBm, -6 dB/oct. LPF at 12,47 kHz 

Less than -90 dBm, IHF A network

Indicators

Signal:  Green LED(-20 Hz to 20 kHz, Vo> 2 V

Clipping:  Red LED Total harmonic Distortion: better than 1%

Protection: Red LED (during the protection or muting is on)

Pilot:  Red LED Power ON

Protection Circuits

Muting:  6 ± 2sec After Power ON

DC Sense:  DC ± 2 V Ouptut Voltage

Thermal:  better than 85°C Heat sink temperature

PC Limiter:  ON RL less than 2 Ω 

FAN Circuit

Better than 60°C High speed run, Heat sink temperature

Less than 45°C Restoration of a low speed run, Heat sink temperature

Front Controls:  32 step Input Attenuator (0 to -20 dB in 1 dB steps, -20 to -30 dB in 2 dB steps, then -33, -37, -42, -50, -60 dB, and infinite attenuation

Push ON/Push Off Power Switch

Power Requirements

220/240 V AC 50/60 Hz (General model) 120 V AC, 60 Hz (US and Canada models)

Power Consumption

600 W (General mode); 400 W, 450 VA (US and Canada model)

Dimensions (W x H x D):  480 x 132 x 423 MM (18-7/8” x 5-1/4” x 16-5/8”)

Weight:  15 kg (33 lbs)

 

Yamaha P-1150 monaural power amp

Yamaha P-series Professional Power Amplifiers P1150 

The power amplifier shall have an input sensitivity of +4 dBn, requiring no more than 1,23 volts RMS to be driven to rated output into a 4 ohm load. The maximum continuous average sine wave power output over a 20 Hz to 20 kHz bandwidth for a single channel shall be (150 watts, 250 watts) onto a minimum 4 ohm load impedance, or (100 watts, 170 watts) into an 8 ohm load with no more than 0,05% thd.

Total harmonic Distortion measured at half rated power, from 20 Hz to 20 kHz, shall be no more than 0,01% . maximum intermodulation distortion, measured using the SMPTE method of 60 Hz and 7 kHz tones mixed in a 4:1 ratio, shall be no more than 0,01% measured at rated power output. Power bandwidth shall be no less than 10 Hz to 50 kHz at half rated power output, and frequency response shall be +0 dB, -1 dB from 10 Hz to 50 kHz. s/n as established by comparing the maximum output with signal to the minimum output noise with a shorted input, shall be no less than 110 dB measured with a -6 dB/octave low pass filter at 12,47 kHz (equal to a “brick wall” filter at 20 kHz), and no less than 115 dB measured with an IHF “A” weighting network. Residual output noise, measured with the input attenuator set at infinite attenuation, shall be no more than _80 dBm with a -6 dB/octave low pass filter at 12,47 kHz, or no more than -90 dBm with an IHF “A” weighting network. Slew rate shall be at least 50 volts per microsecond, full swing.

The amplifier input(s) shall be equipped with both an XLR-3 type connector and a pair of Tip/Ring/Sleeve ¼-inch phone jacks, wired in parallel. The input shall be of the electronically balanced, differential type, with an input impedance of no less than 15 k ohm presented to either balanced or unbalanced sources. The amplifier output(s) shall be equipped with a set of 5-way binding posts for positive, high-current connections, and with parallel-wired Tip/Sleeve 1-4-inch phone jacks for wiring convenience.

Input level shall be adjustable by means of (one or two) detented input attenuator(s) calibrated in 32 steps of from zero to infinite attenuation. The attenuator(s) shall be recessed, and shall be designed so as to be easily adjustable by hand, without any tools. To avoid casual or accidental setting changes, a security cover for the attenuator(s) shall also be provided.

Protection for the speaker load shall be established by means of an output-disconnect relay that is timed out when power is first applied to avoid transients from reaching the load, and that immediately disconnects the load and turns on a front-panel protection indicator in the event that more than 2 volts DC appears across the output. Further protection for the amplifier and load shall be provided by VI limiting circuitry which automatically reduces the power output in the event the load impedance is below 2 ohm for a single channel, (4 ohm for a dual-channel model in bridged mono configuration). The amplifier shall also include a full-time 2-speed fan which operates at high speed under severe thermal stress, and automatically resets to a lower speed as appropriate. Cooling air shall be drawn through a removable cleanable front-panel filter, and exhausted via ports in the tip and side panels of the amplifier.

Signal level indication (per each channel on dual-channel models) shall be provided by two LEDs, one of which turns on when the output THD is equal to or above 1%, which would indicate the onset of clipping, and one which turns on when the output level is equal to or greater than 2 volts RMS, which would indicate the presence of program signal.

Specifications P1150

Power Output Level (THD =0,05%)

20 Hz – 20 kHz :  100 W (at 8 ohm); 150 W (at 4 Ω )

1 kHz:  105 W (at 8 Ω ); 165 W (at 4 Ω )

fr:  10 Hz – 50,000 Hz (8 Ω ) +0 -1 dB

Power Bandwidth (THD <=0,1%)

10 Hz to 100,000 Hz (55 W) at 8 Ω 

10 Hz to 100,000 Hz (75 W) at 4 Ω 

Total harmonic Distortion: 

Less than 0,007% ( 55 W, 20 Hz – 20 kHz, 8 Ω )

Less than 0,003% ( 55 W, 1 kHz, 8 Ω )

Less than 0,005% ( 75 W, 1 kHz, 4 Ω )

Less than 0,01% ( 75 W, 20 Hz – 20 kHz, 4 Ω )

Intermodulation  Distortion (60 Hz : 7 kHz = 4:1)

less than 0,005% (55 W, 8 Ω )

less than 0,01% (75 W, 4 Ω )

Damping Factor

Better than 110 (1 kHz , 8 Ω ); better than 55 (1 kHz  , 4 Ω )

Signal-to-Noise-Ratio: 

Better than 110 dB (Input Short; 12,47 kh z, -6 dB/octave LPF)

Better than 115 dB (Input Short, IHF A Network)

Slew Rate

± 50 V/µsec  (8 Ω , Full Swing)

Sensitivity :  +4 dB (1,23 V rms) for nominal output (4 Ω  load)

Voltage Gain:  26,0 dB

Input Impedance:  better than  15 k Ω , Balanced or Unbalanced (Att. Max)

Residual Noise (Input Att. Minimum)

Less than -80 dBm, -6 dB/oct. LPF at 12,47 kHz

Less than -90 dBm, IHF A network

Indicators

Signal:  Green LED(-20 Hz to 20 kHz, Vo better than  2 V

Clipping:  Red LED Total harmonic Distortion: better than 1%

Protection: Red LED (during the protection or muting is on)

Pilot:  Red LED Power ON

Protection Circuits

Muting:  6 ± 2sec After Power ON

DC Sense:  DC ± 2 V Ouptut Voltage

Thermal:  better than 85°C Heat sink temperature

PC Limiter:  ON RL less than 2 Ω 

FAN Circuit

Better than 60°C High speed run, Heat sink temperature

Less than 45°C Restoration of a low speed run, Heat sink temperature

Front Controls:  32 step Input Attenuator (0 to -20 dB in 1 dB steps, -20 to -30 dB in 2 dB steps, then -33, -37, -42, -50, -60 dB, and infinite attenuation

Push ON/Push Off Power Switch

Power Requirements

220/240 V AC 50/60 Hz (General model) 120 V AC, 60 Hz (US and Canada models)

Power Consumption

400 W (General mode); 250 W, 300 VA (US and Canada model)

dimensions (W x H x D):  480 x 132 x 423 MM (18-7/8” x 5-1/4” x 16-5/8”)

Weight:  13 kg (28,6 lbs)

 

Yamaha A-420 amplifier

Center Defeat Bass and Treble Tone Control

The bass and treble controls provided on A-420 are specially designed with a center defeat position. When set to their center positions, tone control response is perfectly flat, with no influence on the original signal. When tuned for either a boost or cut, they provide smooth, accurate response over a conveniently wide range.

Subsonic Filter

A switchable subsonic filter is provided on the A-420, a subsonic filter is built into the phono equalizer amplifier stage, providing the same performance benefits automatically, whenever the amplifier is reproducing a phono source.

Independent Speaker A/B Selectors

The A-420 provide rear panel connectors and front panel selectors for two separate pairs of speakers. They can be driven independently or simultaneously, allowing you to drive two remotely located speaker pairs together, or to drive a dual speaker pair setup in a single listening environment, for more listening flexibility.

Specifications

Minimum RMS Output Power per Channel:  50 Watts (8 Ω ) from 20 to 20,000 Hz at no more than 0,015% thd

Dynamic Power per Channel (IHF) :  85 W (8 Ω ), 115 W (4 Ω ), 120 W (2 Ω )

Power Bandwidth (Half Rated Power, 8 Ω ):  10 to 50,000 Hz  (0,05% THD)

Damping Factor (1 kHz, 8 Ω ):  no more than 50

Input Sensitivity/Impedance

Phono MC :  160 µV/100 Ω 

Phono MM :  2,5 mV/47 k Ω  

CD, Video, Tape :  150 mV/30 k Ω 

Maximum Input Level

Phono MC :  11 mV (0,02% THD)

Phono MM :  155 mV (0,02% THD)

Output Level /Impedance

Rec Out :  150 mV/600 Ω 

Headphone Jack Rated Output/Impedance (8 Ω ):  0,7 V (0,015% THD)/220 Ω 

Frequency Response: 

CD, Video, Tape :  20 to 20,000 Hz +0 dB -0,5 dB

RIAA Equalization Deviation (20 to 20,000 Hz)

Phono MC RIAA :  ± 0,8 dB 

Phono MM RIAA :  ± 0,5 dB 

Total harmonic Distortion: 

Phono MC to Rec Out (3 V) :  0,01%

Phono MM to Rec Out (3 V) :  0,007%

CD, Video, Tape  to Sp Out :  0,01%

Intermodulation Distortion (8 Ω )

CD, Video, Tape :  0,005% (1 W), 0,01% (half Rated Power)

Signal-to-Noise-Ratio:  (IHF-A Network)

Phono MC (500 µV  input Shorted) :  74 dB 

Phono MM (5 mV  input Shorted) :  90 dB 

CD, Video, Tape (input Shorted) :  100 dB 

Signal-to-Noise-Ratio:  (new IHF)

Phono MC (500 µV  input Shorted) :  72 dB 

Phono MM (5 mV  input Shorted) :  76 dB 

CD, Video, Tape (input Shorted) :  85 dB 

Tone Controls

Bass Boost/Cut :  ± 10 dB at 20 Hz

Turnover Frequency :  350 Hz 

Treble Boost/Cut :  ± 10 dB at 20 kHz

Turnover Frequency :  3,5 kHz

Loudness Control (Level Related Equalization):  -20 dB

Dimensions (W x H x D):  435 x 112 x 327 mm (17-1/8” x 4-3/8” x 12-7/8”)

Weight:  5,9 kg (13 lbs)

 

Castle Harlech speakers

Rather than sacrifice the superb stereo imaging that result from a narrow cabinet, Castle has employed two small polypropylene coned mid/bass drive units in the Harlech -  on the top and one on the front face - instead of a larger mid/bass drive unit.

Each driver works with its own Quarter Wave pipe tuned to different frequencies but which join in a common vent at the speaker's base. The two drive units give exceptional bass extension and superior control but also radiate midrange energy into the room in a way that produces a large, spacious sound with very low distortion.

 

Quarter Wave

Competing speaker systems set themselves apart by the techniques with which bass extension is achieved. For the largest models in its range of floor-standing speakers Castle has adopted Quarter Wave loading. This technique can be traced back to the work of the legendary Paul Voigt inn the 1930s and has more in common with vibrating columns of air in organ pipes and folded horns that with alternative methods of bass extension like reflex or transmission line loading.

Designer Roger Loughton's execution of Quarter Wave techniques for Castle uses the latest measurement and optimisation techniques. The open, natural quality of attuned pipe has been retained in a tapered version that, with the drive unit at an optimum position along the pipe, reduces unwanted excitation at the fundamental frequency of the pipe and associated harmonics by natural acoustic filtering. Tapering the pipe also allows it to be folded inside the cabinet that not only brings it down to domestic size but enables the internal structure considerably to add to the rigidity of the enclosure.

The superiority of the Quarter Wave technique, correctly executed, over orthodox reflex loading with a cabinet of the same or bigger size is higher bass efficiency, maintained down to a lower frequency. Quarter Wave systems have the natural power and character of true, deep bass.

 

Specifications

Frequency Response:  40 Hz - 22,000 Hz

Nominal Impedance:  8 Ω

Sensitivity:  88 dB for 1 W at 1 m

Amplifier Requirements:  25 - 150 watts

System Type:  Quarter Wave

Bass Unit:  Twin 130 mm in a cast chassis with injection moulded cone

Treble Unit:  25 mm metal dome

Dimensions (W x H x D):  200 x 940 x 320 mm

Weight:  48 kg (packed)

 

Castle Howard S2 speakers

The Howard S2 is the largest member of the Castle Quarter Wave family. The narrow fronted cabinet coupled with a 25 mm metal dome tweeter guarantees stable stereo imagery with excellent presentation of depth and separation

The two 165 mm plasticised paper pulp drivers were developed especially for the Howard. They have massive high energy magnets, stiffer than usual suspensions and are built into substantial die-cast chassis.

These drive units excite the tapered and folded Quarter ave pipe inside the rigid cabinet. Exceptionally clean, extended bass with low distortion, high energy mid and sweet treble are the hallmarks of the Howard S2.

 

Our largest Quarter Wave system loudspeaker, the Castle Howard S2, is tuned to roll of below 35 Hz, making the system larger than the Harlech, and requiring an extra bass driver to load its longer horn and increased internal volume. Thanks to the high efficiency inherent in Quarter Wave systems, the increased cabinet volume also produces increased sound volume which remain slow in distortion and high in accuracy, the two key parameters for true high fidelity sound. Higher register are delicately handled by our proven 25 mm metal dome treble unit. As beautiful to look at as it is to listen to, the new Castle Howard S2 is engineered for a lifetime's enjoyment.

 

The room filling spaciousness in the Howard S2's sound is aided by careful positioning of the bass/mid drivers on both the front and top surfaces of the cabinet, so you can enjoy more of the music, in more locations within the room.

 

Specifications

Frequency Response:  35 Hz - 22,000 Hz

Nominal Impedance:  8 Ω

Sensitivity:  88 dB for 1 W at 1 m

Amplifier Requirements:  25 - 130 watts

System Type:  Quarter Wave

Bass Unit:  Twin 165 mm in a cast chassis with doped paper cone

Treble Unit:  25 mm metal dome

Dimensions (W x H x D):  230 x 1030 x 360 mm

Weight:  52 kg (packed)

 

Cybernet SRC-80 receiver

SRC-80 Integrated Stereo Receiver - The Slimline Series SL-80

Amplifier Section Features:

Direct coupled OCL circuitry

Wide, dynamic range phono equalizer amplifier

Loudness compensation

High and low filters

Moving magnet and moving coil cartridge capability

Detented tone controls

41 detent volume control

Two tape monitors with 2-way dubbing

Instant audio mute switch

 

Tuner Section Features

Quartz controlled frequency synthesized tuning

Fluorescent digital display

14 programmable preset station selection and indicators

Automatic scanning

Sensitive dual gate MOS FET in FM front end

Highly selective IF section with 3 dual element ceramic filters

PLL multiplex decoder

LED signal strength and auto stereo indication

Last channel memory circuit

 

Specifications

Amplifier Section

Power Output:  50 W + 50 W (20 - 20,000 Hz) at 8 Ω

Total Harmonic Distortion (rated power at 20-20,000 Hz):  0,08% at 8 Ω

SMPTE Intermodulation Distortion:  0,08%

Frequency Response:  20 - 20,000 Hz ±0,5 dB

Power Bandwidth:  7 - 35,000 Hz _3 dB

Input Sensitivity/Impedance

Phono MM :  2,5 mV/47 k Ω

Phono MC :  100 µV/47 K Ω

Others :  150 mV/47 k Ω

Huma and Noise Ratio

Phono MM :  73 dB

Phono MC :  62 dB

Others :  93 dB

Maximum Input Voltage

Phono MM :  150 mV

Phono MC :  6 mV

Damping Factor:  40 (8 Ω , 1 kHz)

Tone Controls

Bass :  ±10 dB at 100 Hz

Treble :  ±10 dB at 10 kHz

Loudness Compensation +7 dB (at 100 Hz) +3,5 dB (at 10 kHz)

Filters

High :  10 kHz (6 dB/oct)

Low :  40 Hz (6 dB/oct)

Audio Mute:  -20 dB

Tape Recording Output :  130 mV (at rated input sensitivity)

FM Section

Tuning Range:  87,5 to 108 MHz

Usable Sensitivity: 

Mono :  10,9 dBf

Stereo :  20 dBf

50 dB Quieting Sensitivity

Mono :  18 dBf, 4,4 µV (IHF)

Stereo :  40 dBf, 54,7 µV (IHF)

Total Harmonic Distortion

Mono :  0,15%

Stereo :  0,3%

Alternate Channel Selectivity:  60 dB (±400 kHz)

Capture Ratio:  2 dB

Selectivity )±400 Hz):  60 dB

Stereo Separation(at 1 kHz):  45 dB

Audio Frequency Response:  30 Hz - 15 kHz (±0,5 dB)

Signal-to-Noise Ratio: 

Mono :  70 dB (A-weighted)

Stereo :  65 dB (19/38 kHz filtered)

Spurious and IF Rejection:  70 dB

Image Rejection:  45 dB

Subcarrier Ratio:  65 dB

Tuning Frequency Space:  50 kHz

Antenna:  75 /300 Ω

AM Section

Tuning Range:  531 to 1,602 kHz

Sensitivity (loop Antenna):  350 µV/m (S/N=20 dB)

Image Rejection:  45 dB (600 kHz)

Alternate Channel Selectivity:  45 dB (20 kHz)

Distortion: 0,5%

Signal-to-Noise Ratio:  45 dB

Antenna:  Built-in adjustable ferrite bar, and provision for ext. Antenna

Power Requirements:  120 V, 220 V, AC 50/60 Hz

Dimensions (W x H x D):  430 x 106 x 390 mm (16-15/16" x 4-3/16" x 15-3/8")

Weight:  12,3 kg