KEF C1 loudspeakers

 C1 Bookshelf Speaker
Compact, versatile and potent. The C1 pairs the superbly accurate 19mm (0.75in.) tweeter and 'tangerine' waveguide from the latest Q Series with a slot-ported 100mm (4in.) midrange/bass driver. Both sit on a dense two-layer front baffle system to deliver a complex, profoundly realistic and spatially accurate soundscape. With excellent power handling and a carefully tuned crossover, the C1 delivers a generously full performance that belies its discreet appearance and modest size. The front firing port makes it easy to position and the integrated wall bracket makes wall mounting a simple operation. 

Aluminium dome tweeter with 'Tangerine' waveguide
The same 19mm (0.75in.) tweeter from the latest Q Series reproduces vocals with spellbinding realism - the unique 'Tangerine' waveguide disperses its sweet natural clarity evenly throughout the room and provides excellent protection from straying fingers. 

Gold-plated terminals
The exceptional acoustic definition you experience depends on the recorded signal being perfectly transmitted, so to eliminate the risk of tarnishing, the binding posts of the C Series are gold-plated. 

Specifications
Type: Two-way bass reflex
Drive Units:
High Frequency: 19 mm (0.75") aluminium
Low Frequency: 100 mm (4")
Frequency Range: 65 Hz - 40 kHz
Crossover Frequencies: 2.5 Hz
Maximum Output: 106 dB
Amplifier Requirements: from 10 - 100 W
Sensitivity: 87 dB (2.83 V/1m)
Magnetic Shielding: Yes
Input Impedance: 8 Ohms
Dimensions (HxWxD): 260 x 150 x 221 mm (10.25 x 5.9 x 8.7 in.)
Weight: 3.2 kg (7lbs)

I like

Onkyo TX-7430 receiver

Quartz Synthesized Tuner Amplifier

Specifications

Amplifier Section

Power Output:  45 watts per channel, min. RMS, at 8 Ω , both channels driven, from 20 Hz to 20 kHz, with no more than 0,08% T.H.D.

Musical Power Output: 

2 x 126 watts at 4 Ω  , 1 kHz (DIN)

2 x 78 watts at 8 Ω , 1 kHz (DIN)

Continuous Power Output:

2 x 70 watts at 4 Ω , 1 kHz (DIN)

2 x 55 watts at 8 Ω , 1 kHz (DIN)

Total Harmonic Distortion

0,08% at rated power

0,08% at 1 watt output

Intermodulation Distortion:

0,08% at rated power

0,08% at 1 watt output

Damping Factor:  35 at 8 Ω

Frequency Response:  20 - 30,000 Hz ±1 dB

RIAA Deviations:  20 - 20,000 Hz ±0,8 dB

Input Sensitivity / impedance:

Phono :  2,5 mV / 50 k Ω

CD, Tape Play :  150 mV / 50 k Ω

Tape Rec :  150 mV / 3,5 k Ω  (phono)

Phono Overload:  120 mV RMS at 1 kHz, 0,08% T.H.D.

Signal-to-Noise Ratio:

Phono :  85 dB (at 10 mV input, A weighted);  75 dB (IHF A-202)

CD, Tape :  95 dB (A weighted);  80 dB (IHF A-202)

Tone Controls:

Bass : ±10 dB at 100 Hz

Treble :  ±10 dB at 10 kHz

Muting:  -20 dB

Tuner Section

FM

Tuning Range:  87,5 - 108,0 MHz (50 kHz steps)

Usable Sensitivity

Mono :  12,8 dBf, 1,2 µV, 75 Ω ;  1,0 µV (s/n 26 dB, 40 kHz Devi.) 75 Ω  DIN

Stereo :  18,0 dBf, 2,2 µV, 75 Ω ; 23 µV (s/n. 46 dB, 40 kHz Devi.) 75 Ω  DIN

50 dB Quieting Sensitivity

Mono :  18,0 dBf, 2,2 µV, 75 Ω

Stereo :  37,2 dBf, 20 µV, 75 Ω

Capture Ratio:  1,5 dB

Image Rejection Ratio:  85 dB

IF Rejection Ratio:  90 dB

Signal-to-Noise Ratio :

Mono :  72 dB

Stereo :  66 dB

Selectivity:  50 dB DIN (±300 kHz, 40 kHz dev.)

AM Suppression Ratio:  50 dB

Harmonic Distortion

Mono :  0,15%

Stereo :  0,30%

Frequency Response:  30 - 15,000 Hz ± 1,5 dB

Stereo Separation:  45 dB at 1 kHz; 30 dB at 100 - 10,000 Hz

AM

Tuning Range:  522 - 1611 kHz (9 kHz steps)

Usable Sensitivity:  30 µV

Image Rejection Ratio:  40 dB

IF Rejection Ratio:  40 dB

Signal-to-Noise Ratio:  40 dB

Harmonic Distortion:  0,7%

General

Power Requirement:  120 V, 220 V, 240 V;  50/60 Hz

Dimension (W x H x D):  435 x 110 x  345mm (17-1/8" x 4-3/8" x 13-1/2")

Weight:  7,5 kg (16,5lbs)

Onkyo TX-7520 receiver

Quartz Synthesized Tuner Low Impedance Drive Discrete Amplifier 

Specifications

Amplifier Section

Power Output:  45 watts per channel, min. RMS, at 8 Ω , both channels driven, from 40 Hz to 20 kHz, with no more than 0,1% T.H.D.

Musical Power Output: 

2 x 130 watts at 4 Ω  , 1 kHz (DIN)

2 x 80 watts at 8 Ω , 1 kHz (DIN)

Continuous Power Output:

2 x 70 watts at 4 Ω , 1 kHz (DIN)

2 x 55 watts at 8 Ω , 1 kHz (DIN)

Total Harmonic Distortion

0,1% at 1 watt output

Intermodulation Distortion:

0,1% at 1 watt output

Damping Factor:  35 at 8 Ω

Frequency Response:  20 - 30,000 Hz ±1 dB

RIAA Deviations:  20 - 20,000 Hz ±0,8 dB

Input Sensitivity / impedance:

Phono :  2,5 mV / 50 k Ω

CD, Tape Play :  150 mV / 50 k Ω

Tape Rec :  150 mV / 3,5 k Ω  (phono)

Phono Overload:  120 mV RMS at 1 kHz, 0,1% T.H.D.

Signal-to-Noise Ratio:

Phono :  85 dB (at 10 mV input, A weighted);  75 dB (IHF A-202)

CD, Tape :  95 dB (A weighted);  80 dB (IHF A-202)

Tone Controls:

Bass : ±10 dB at 100 Hz

Treble :  ±10 dB at 10 kHz

Muting:  -20 dB

Tuner Section

FM

Tuning Range:  87,5 - 108,0 MHz (50 kHz steps)

Usable Sensitivity

Mono :  12,4 dBf, 2,3 µV, IHF;  1,2 µV,  75 Ω  DIN

Stereo :  2,5 µV, 75 Ω

50 dB Quieting Sensitivity

Mono :  2,2 µV, 75 Ω

Stereo :  22 µV, 75 Ω

Capture Ratio:  1,5 dB

Image Rejection Ratio:  85 dB

IF Rejection Ratio:  90 dB

Signal-to-Noise Ratio :

Mono :  70 dB

Stereo :  65 dB

Selectivity:  50 dB DIN (±300 kHz, 40 kHz dev.)

AM Suppression Ratio:  50 dB

Harmonic Distortion

Mono :  0,15%

Stereo :  0,30%

Frequency Response:  30 - 15,000 Hz ± 1,5 dB

Stereo Separation:  40 dB at 1 kHz; 30 dB at 100 - 10,000 Hz

Muting Level:  17,2 dBf, 2 µV, 75 Ω

Stereo Threshold:  17,2 dBf, 2 µV, 75 Ω  

AM

Tuning Range:  522 - 1611 kHz (9 kHz steps)

Usable Sensitivity:  30 µV

Image Rejection Ratio:  40 dB

IF Rejection Ratio:  40 dB

Signal-to-Noise Ratio:  40 dB

Harmonic Distortion:  0,8%

General

Power Requirement:  120 V, 220 V, 240 V;  50/60 Hz

Dimension (W x H x D):  435 x 110 x  317mm (17-1/8" x 4-3/8" x 12-1/2")

Weight:  7,0 kg (15,4 lbs)

Akai X-330 reel-to-reel

Multi-Purpose Program Minder Tape Recorder

The X-330 enables to enjoy different music for 24 hours, in addition to selection and repeating your favorite tune forever.

 Program minder automatic continuous reverse

Sensing tape continuous reverse

Manual reverse

Cross-field head

3-speed capstan drive motor

Magnetic brake

Up to 10-1/2" reel acceptable

Outstandig features:

4-track stereo/monaural recording/playback

Program minder (Automatic continous reverse)

Sensing tape continuous reverse, manual reverse

Cross field head

Magnetic brake with tach generator (stoppage occurs within 3 seconds from F.F. / RWD  condition (10-1/2" reel)

Up to 10-1/2" reel acceptable. Back tension control

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

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

4 heads: Erase; playback; record and bias heads

40 W all silicon transistorized amplifier

12 hours continuous HiFi stereo recording capacity (total 24 hours) at 1-7/8 ips with 7,200 foot tape

Shield type head for high Signal-to-Noise ratio

Tape lifter in fast forward and rewind operation

Track selector for simple selection between stereo and monaural

Automatic stop/shut off, Automatic pinch wheel release

Sound on sound, Sound with sound, Sound over sound, Echo effect

100 kHz biased for FM multiplex recording

Magnetic cartridge jacks (Direct recording and playback from turntable), Stereo headphones jack, DIN Jack

Remote controllable, AC outlet with automatic shut off switch

Standard/low noise tape selector. Bass and treble controls

Tape cleaner, 4-digit index counter with reset button, VU meters

Fine oil-finished wooden cabinet

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

Specifications

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

Wow and Flutter:

At 7-1/2 ips :  less than 0,04% RMS

At 3-3/4 ips :  less than 0,07% RMS

At 1-7/8 ips :  less than 0,15% RMS

Frequency Response [Standard Tape / low Noise tape]:

At 7-1/2 ips :  30 to 25,000 Hz / 30 to 26,000 Hz ±3 dB

At 3-3/4 ips :  30 to 18,000 Hz / 30 to 20,000 Hz ±3 dB

At 1-7/8 ips :  30 to 9,000 Hz / 30 to 13,000 Hz  ±3 dB

Distortion:  within 1,5%,  1 kHz,  0 VU at 7-1/2 ips

Signal-to-Noise Ratio:  better than 50 dB

Input Level:

Microphone :  more than 0,5 mV

Line :  more than 50 mV

DIN :  more than 10 mV

Power Output: 

15 W maximum each channel at Undistorted Power, total 30 W.

20 W maximum each channel at Music power, total 40 W

Equalization:  Standard or Low Noise Tape. Correct equalization for playback of tapes recorded to the NABTB curve

Recording Bias Frequency:  100 kHz

Recording Level Indicator:  2 VU meters

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

Fast Forward and Rewind Time:  75 seconds using 1,200 foot tape (7" reel) at 50 Hz , 60 seconds at 60 Hz

Heads:  4 heads - Erase, playback, record and bias heads

Motor:  3 motor - Hysteresis synchronous 3-speed motor for capstan drive. Two 6-pole eddy current outrotor motors for supply and take-up reel drive with tach generator

Reel Size:  10-1/2"; 7' and 5" reels

Speaker:  2 4' x 6" speakers

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

Power Consumption:  180 VA

Dimensions (W x H x D):  375 x 436 x 238 mm (14-3/4" x 17-1/8" x 9-3/8")

Weight:  22 kg (48,4 lbs)

I like

McIntosh MC 250 power amp

Solid State Powerful Amplifier

Speciall Features:

The MC 250 is completely stable when connected to any loudspeaker system or even to reactive loads. The MC 250 has special circuits to prevent damage by short circuit or oen circuit of the output loads, or by any amount of output imedance mismatch. Therminal cutouts are mounted on the output transistor heaat sinks to provide protection against inadequate ventilation.

Specifications

Power Output: 

50 watts RMS continuous power per channel, both channels operating into a 4 Ω, 8 Ω or 16 Ω load

100 watts RMS monophonic

Total Harmonic Distortion:  less than 0,25% at rated power output fromm 20 to 20,000 Hz . Distortion typically measures less than 0,1% and decreases as output power is reduced.

Intermodulation Distortion:  less than 0,25% for any combinations of frequencies between 20 and 20,000 Hz at 100 peak watts output per channel or at any level less than 100 peak watts per channel

Frequency Range:  at rated output, both channels operating +0, -0,25 dB 20 through 20,000 Hz. At reduced output, both channels operating +0, -3 dB 5 through 70,000 Hz

Output Impedance:  output taps are provided for 4 Ω, 8 Ω and 16 Ω loads. Full rated power output is provided at each output tap. The 16 Ω output will provided 25 volts RMS for constant voltage multiple speaker distribution lines. Monophonic Output taps are provided for 2, 4 and 8 Ω. Full rated power output is provided at each output tap. These taps are also available on the octal socket, left center of control panel.

Output Damping Factor:  greater than 15 at 4 Ω ; 38 at 8 Ω, and 16,6 at 16 Ω

Input Sensitivity/Impedance:  0,5 volt will produce rated power output; a gain control for each channel allows independent adjustment of amplification in each channel. Input impedance is 200,000 Ω

Hum and Noise:  greater than 90 dB below rated output

Controls:

Mono - Stereo switch

Left Gain,  and Right Gain

Semiconductors:  24 silicon transistors; 23 silicon rectifiers and diodes

Power Requirements:  117 volts AC 50-60 Hz

Power Consumption:  50 watts at zero signal output; 250 watts at rated output

Dimensions (W x H x D):  10-5/8 x 7-1/16 x 15-5/8 inches

Weight:  35 lbs net; 40 lbs in shipping carton

Chassis:  Chrome and black

I like

McIntosh MTI 100

The MTI100 Integrated Turntable is so much more than just a turntable. A one-of-a-kind product, the MTI100 is designed for those who want maximum flexibility in their home audio system but don’t want – or don’t have the space for – a large audio system in their home.

 Besides playing 33-1/3 and 45 rpm records, it also includes a power amplifier, a vacuum tube preamplifier, a phono preamplifier, analog and digital inputs, a Bluetooth® receiver, a subwoofer output, stereo speaker outputs, and a headphone jack.

 The dedicated phono preamplifier is housed in a custom shielding box that prevents interference or noise from seeping into the vinyl signal.

 Comes with a Sumiko Olympia Moving Magnet cartridge, whose upgraded stylus and cantilever assembly allow for more dynamic punch and improved frequency response.

 Class D amplifier is rated for 80 Watts per channel into 4 Ohms or 50 Watts per channel into 8 Ohms.

 Marries vintage vinyl records with modern music streaming via a High Definition Bluetooth input that ensures you receive the best sound quality possible from your Bluetooth device.

Specifications:

Power Output:

50 Watts per channel into 8 Ω

80 Watts per channel into 4 Ω

Total Harmonic Distortion:

Amplifier :  0.5% maximum (from 20 Hz to 20 kHz)

Preamplifier :  0.2% maximum (from 20 Hz to 20 kHz)

Signal to Noise Ratio:

Amplifier :  93 dB

High Level :  90 dB

Phono :  75 dB

Dynamic Headroom:

1,0 dB at 8 Ω

1,3 dB at 4 Ω

Damping Factor:

Greater than 200 at 8 Ω

Greater than 100 at 4 Ω

Frequency Response:  from 20 Hz to 20 kHz (+0, -0.7dB)

Inputs : 1 Unbalanced input; 1 Coax input; 1 Optical input

Outputs: 1 Unbalanced output (bridged to AMP IN); 1 Sub output

Tonearm:  Damped machined aluminum tube arm with lateral type bearing

Overall Dimensions (W x H x D):489 x 171,5 x 356 mm (19-1/4” x 6-3/4” x 14”)

Weight: 15,2 kg (33.5 lbs) net;  18,4 kg (40.5 lbs) in shipping carton

I like

Fostex A-4 tape recorder

Introducing the A-4.

Four tracks on quarter-inch tape (a format our engineers pioneered) at a price that's as irresistible as we could make it. The A-4 drives 7" reels at either 7½ ips or 15 ips. So you can decide between the ultimate in multitrack economy or push for those extra dB's of sound quality.

Like its 8-track big brother, the A-4 has a transport system built from the ground up specifically for multitrack recording. Three low power consumption D.C. motors are used to eliminate the heat problems typical of A.C. motors. And an FG servo controls the capstan motor to prevent line voltage fluctuations from playing havoc with your sound.

The A-4 is a classic three-head design. Separate heads are used for recording, playback and erasing. We;ve even designed a new specially contoured head that gives you extended frequency response and fewer low frequency head bumps.

Operation is fast and easy, too. Select the tracks you want to record on. Then enter the record mode . The A-4 is set up to record where you want to record and automatically play back the other tracks. It also lets you punch in or out at the touch of a botton with no cliks or pops.

You can buy an optional remote foot-switch that gives you a third hand for punching in and out. Just play along with your song, then tap the footswitch to start recording. You'll be able to concentrate onn your music instead of your machine.

The A-4 brings you the kind of convenience we introduced on the A-8. easy to use digital tape counter with bright LED readout. And the Return To Zero memory function for fast tape checks. There's a ±10% pitch control for special effects, optional Dolby C noise reduction system, easy to use. Edit mode with tape dump capabilities and modular electronics for fast economical servicing.

It all adds up to an easy to use, easy to afford multitrack recorder. That's the A-4.

Specifications

Tape:  1/4 inch tape width, 1 mil base

Format :  4 track, 4 channel

Heads:  4 track record; 4 track reproduce, 4 track erase

Reel Size:  7 inch

Tape Speed:  15 and 7½ ips (38 and 19 cm/s) ±0,5%

Pitch Control:  ±10%

Line Input:  -10 dBV (0,3 V) / impedance 30 k Ω unbalanced

Line Output:  -10 dBV (0,3 V) load impedance 10 k Ω or higher unbalanced

Record Level Calibration Equalization:  0 VU referenced to 250 nWb/m of tape flux NAB

Wow and Flutter: 

±0,06% peak (IEC/ANSI) wtd., at 15 ips

±0,10% peak (IEC/ANSI) wtd., at 7½ ips

Fast Wind Time:  130 seconds typ typ. for 1800 ft of tape

Overall Frequency Response: 

At 15 ips :  40 Hz - 20 kHz ±3 dB

At 7½ ips ;  40 Hz - 18 kHz ±3 dB

Signal-to-Noise Ratio (Sync/Reproduce)

At 15 ips ;  65 dB wtd.

At 7½ ips :  referenced to 1 kHz , 3% T.H.D. level

Total Harmonic Distortion:  less than 1% at 1 kHz 0 VU

Crosstalk (Reproduce):  50 dB (at 1 kHz)

Erasure:  better than 70 dB at 1 kHz

Power Requirements:  120 V AC 60 Hz , 35 W

Dimensions (W x H x D):  360 x 340 x 170 mm (14" x 13-1/2" x 6-3/4")

Weight:  13 kg (29 lbs)

I like

Fostex A-2 reel-to-reel

The A-2 is two track on quarter-inch tape, mastering machine. The standard of the industry. But with one added attraction. The A-2 has sync. Which means you can extend its usefulness. When you need to cut a high quality, low noise, low distortion master, ecord on the A-2 in its normal mode. But when you need to perform a little fixing up, or you want to do some added production (like adding a few ideas at the last minute), use the A-2's Sync mode. It's built-in to give you added performance flexibility for your dollar. Another way personal Multitrack fits the equipment to your needs. And your wallet.

The A-2 packs all the features and functions of our multitrack recorders into a rugged, relatively lightweight mastering machine. It includes LED indicators of peak transient overload in record or playback modes. The A-2 gives you the kind of quality needed to help you produce stereo masters that truly showcase your talent.

Specifications

Tape:  1/4 inch tape width, 1 mil base

Format :  2 track, 2 channel

Heads:  2 track record; 2 track reproduce, 2 track erase

Reel Size:  7 inch

Tape Speed:  15 and 7½ ips (38 and 19 cm/s) ±0,5%

Pitch Control:  ±10%

Line Input:  -10 dBV (0,3 V) / impedance 30 k Ω unbalanced

Line Output:  -10 dBV (0,3 V) load impedance 10 k Ω or higher unbalanced

Record Level Calibration Equalization:  0 VU referenced to 250 nWb/m of tape flux NAB

Wow and Flutter: 

±0,06% peak (IEC/ANSI) wtd., at 15 ips

±0,19% peak (IEC/ANSI) wtd., at 7½ ips

Fast Wind Time:  130 seconds typ typ. for 1800 ft of tape

Overall Frequency Response: 

At 15 ips :  40 Hz - 20 kHz ±3 dB

At 7½ ips ;  40 Hz - 18 kHz ±3 dB

Signal-to-Noise Ratio (Sync/Reproduce)

At 15 ips ;  65 dB wtd.

At 7½ ips :  referenced to 1 kHz , 3% T.H.D. level

Total Harmonic Distortion:  less than 1% at 1 kHz 0 VU

Crosstalk (Reproduce):  50 dB (at 1 kHz)

Erasure:  better than 70 dB at 1 kHz

Power Requirements:  120 V AC 60 Hz , 35 W

Dimensions (W x H x D):  360 x 340 x 170 mm (14" x 13-1/2" x 6-3/4")

Weight:  13 kg (29 lbs)

I like

Aiwa SA-C30 mini pre-amp

Stereo Pre-amplifier - Control Unit

Features:

RIAA deviation of ±0,2 dB (20 Hz - 20 kHz) and phono Signal-to-Noise of 87 dB

Low-noise transistors, used in the first stage, are combined with high gain ICs to reduce noise and improve stability. Carefully selected polypropylene capacitors and high-precision metal-film resistors are used as the RIAA elements for an RIAA deviation of less than ±0,2 dB over a frequency range of 20 Hz to 20 kHz, thereby yielding an extremely accurate frequency response. The maximum rated input of 200 mV (at 1 kHz) assures an ample margin for the input signals.

Two power supplied (plus and minus) with high-performance differential amplifier ICs.

A plus-minus dual power supply design is used for the high-performance differential amplifier ICs in the amplifier circuit. This allows a faithful amplification of the signals with a minimum of distortion.

A high-performance tone control circuit that is bypassed when the knobs are set at the center "0" position.

A low-cut filter suppresses noise components in the ultra-low-frequency range such as those generaated by a warped record.

With just a flick of the muting switch, the power output can be reduced to one-tenth of the set level.

The loudness switch enhances the low-frequencies when listening at low volumes.

Specifications

Signal-to-Noise Ratio (IHF A curve short circuited):

Phono :  87 dB

Tuner :  98 dB

Aux :  98 dB

Tape :  98 dB

RIAA Deviation :  ±0,2 dB )20 Hz to 20 kHz)

Inputs Sensitivity/Impedance

Phono :  2,5 mV (200 mV max. input)

Tuner, Aux 1, Aux 2 :  150 mV/47 k Ω

Tape Monitor: 

Play :  150 mV/47 k Ω

Rec :  150 mV/47 k Ω

Output Level/Impedance:  0,8V/47 k Ω

Tone Controls

Bass  :  ±8 dB at 100 Hz (600 Hz)

Treble  :  ±8 dB at 10 kHz (3,5 kHz) 

Low Filter:  30 Hz/6 dB/octave

Muting:  -20 dB

Loudness :  +7 dB at 100 Hz ; +3,5 dB at 10 kHz (with -40 dB)

Semiconductors:  2 ICs; 10 Transistors; 10 Diodes; 5 LEDs

Power Requirements:  220 V, 50/60 Hz

Power Consumption:  5 W

Dimensiond (W x H x D):  250 x 71 x 229,5 mm

Weight:  1,85 kg

I like

Aiwa SA-P30 mini power amp

DC Stereo Power Amplifier SA-P30

Features:

Toroidal power transformer for compact size and high output power

The large capicty power supply is composed of a toroidal transformer with particularly high efficiency and two 10,000 µF large-sized design capacitors. This exhibits ample margin, and more than enough power is supplied for an effective output of 35 W + 35 W. this enables dynamic, high quality sound reproduction.

A wide-range DC Amplifier that reproduces the original sound with faithfully

With this DC Amplifier, no condensers are used within the load return loop since condensers can cause a phase distortion

The system can be upgraded to a 70 W monaural amplifier with just a flick of a switch.

A switch makes a BTL connection turning this 35 W + 35 W stereo amplifier into a 70 W monaural amplifier. If one more of this unit is added on in the future, the system can be upgraded into a 70 W + 70 W power amplifier

Protection Circuits

The protection circuit employs a newly developed IC and a relay eliminates "pop" noise produced when the power is switched on and off. Other features protect the transistors from short-circcuits in the output and also the speakers which are isolated when leakage of DC is detected in the output.

LED bar graph display to indicate the output level.

Specifications

Power Output:  35 W + 35 W with 4 Ω impedance (0,5% distortion, 20 Hz to 20 kHz)

Distortion:  0,02% (1 kHz)

Input Sensitivity/Impedance:  560 mV/47 k Ω

Signal-to-Noise Ratio:  112 dB

Damping Factor:  more than 30 (8 Ω, 1 kHz)

Circuit System:  DC amp

Semiconductors:  4 ICs; 10 Taransitors; 2 FETs; 25 Diodes; 6 LEDs

Power Requirements:  220 V, 50/60 Hz

Power Consumption:  240 W

Dimensions (W x H x D):  250 x 71 x 218 mm

Weight:  4,1 kg

I like