Akai GX-280D-SS tape deck

4-Head 3-Motor Automatic Reverse Surround Stereo Tape Deck

Akai's GX Head 4-Channel Surround Stereo system eliminates the inability to pick up and reproduce true concert hall sound. Every pitch of sound and reverberation effect is reproduced with all of the exciting "sense of presence" experienced when attending a live concert. Akai's surround stereo supplements conventional stereo's two front speakers with two additional rear speakers to front the "2-2 system". The listener is surrounded by two sets of speakers (left & right front and left & right rear). This arrangement does not mean, however, that simply adding two speakers to a 2-channel stereo system is all that is necessary for 4-channel stereo playback. Four separate recordings are made using four individual channels (four tracks in one direction) of the magnetic recording tape. This 4-channel stereo tape feeds into four pre and main amplifiers to activate a 4-speaker system. Thus, at playback time, sounds from separate channels are emitted from each speaker providing the listener with a feeling that he is listening to concert hall sound from the best seat in the auditorium. Model GX-280D-SS is a compatible 4-channel/2-channel stereo model. For 2-channel stereo operation, only the front channels are utilized. For exciting 4-channel surround stereo, a 4-channel stereo external amplifier or two 2-channel stereo amplifiers can be used to activate a 4-speaker system.

 

GX (Glass & Crystal Ferrite) Head

Akai has equipped this model with its new and amazing Glass & Crystal Ferrite Recording and Playback heads to bring you unequalled open reel high fidelity sound. With the Glass & Crystal Ferrite head, superbly wider frequencies with clear highs can be recorded in all their true fidelity with low noise tape. In other words, with the GX head, a high dynamic range and excellent Signal-to-Noise Ratio are achieved. The secret of this quality head is made of single crystal ferrite and is mounted and set in glass. The superior high range characteristics are contributable to thw structure of the head gap which focused the magnetic field into a sharp oblong radius. This focused field recording system minimizes high frequency loss, eliminating undue equalization and achieving a wider dynamic range.

 

Specifications

Track System:  4-track, 4/2-channel stereo/monaural system

Reel Capacity:  up to 7" reel

Tape Speed:  7-1/2 and 3-3/4 ips (±0,5%)

Wow and Flutter:

At 7-1/2 ips :  less than 0,10% RMS

At 3-3/4 ips :  less than 0,15% RMS

Frequency Response (using Low Noise Tape)

At 7-1/2 ips :  20 Hz to 25,000 Hz (±3 dB)

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

Frequency Response (using Regular Tape)

At 7-1/2 ips :  30 Hz to 23,000 Hz (±3 dB)

At 3-3/4 ips :  30 Hz to 19,000 Hz (±3 dB)

Distortion:  less than 0,8% (1,000 Hz, "0" VU)

Signal-to-Noise Ratio:  55 dB

Erase Ratio:  better than 70 dB

Bias Frequency:  110 kHz

Heads :  4 - GX recording and playback, full-track erase, 2-channel erase head

Motors:  3 - One Servo motor for direct capstan drive, two 6-pole outer-rotor motors for supply and take-up reel drive

Fast Forward and Rewind Time:  90 seconds using a 1200 ft tape at 60 Hz

Recording Capacity:

2-channel Stereo : 2 hrs (1,200 ft tape, 3-3/4 ips)

4-channel Stereo : 1 hr (1,200 ft tape, 3-3/4 ips)

Output Jacks

Line :  4x 1,23 V (0 VU)/10 k Ω ; Required load impedance more than 25 k Ω

Phone : 2x 40 mV/8 Ω

Input Jacks

Microphone :  4x 0,5 mV/10 k Ω

Line :  4x 0,1 V/150 k Ω

DIN Jack: 2x  0,4 V/60 mV (High) 10 mV (Low)

Semiconductors:  68 Silicon Transistors; 52 Diodes

Power Requirements:  100 V to 240 V 50/60 Hz

Power Consumption:  140 W

Dimensions (W x H x D):  435 x 505 x 250 mm (17,4" x 20,2" x 10")

Weight:  22,4 kg (49,5 lbs)

 

Akai GX-265D tape deck

Stereo Tape Deck

AC Servo Motor Direct Capstan Drive System

6 Head system Automatic and manual Reverse Recording and Playback

One each GX forward recording, GX reverse recording, GX forward playback, GX reverse playback, forward erase, and reverse erase head make up the superior GX Head reverse recording and Playback system of this model. The quality and special process of the GX Head materials result in a wider dynamic range, better high frequency characteristics and tone quality and longer lasting performance. Manual Reverse Button and Automatic Sensing Tape Reverse completely eliminate the necessity of inverting reels by hand.

 

Symmetrical Head Block Layout for identical performance in both directions.

The arrangement of the head block is completely symmetrical in relation to the center capstan. The short and equi-distant tape path within the head block and between heads and reel tables on both sides assure identical performance in both directions. Tension Arms on both the take-up and supply reel sides provide perfect tape tension, also contributing to operating stability.

AC Servo Motor for capstan drive, Wow and Flutter reduced to 0,06.

The GX-265D employs a 3 motor drive system with a new AC Servo Motor for direct capstan drive, Rubber belts, flywheels, etc. are eliminated for reduced interference. This coupled with the center capstan system of this model reduces wow and flutter to an amazing 0,06%.

 

Microphone/Line Mixing

Individual Microphone and Line Input Level Controls and a built-in mic-line mixing circuit facilitate easy sound mixing from two separate sources.

Quick Pause Control

Depress the pause Switch to immediately suspend reel movement. When Pause mode is effected, the pinch wheel separates from the capstan by only 0,5 mm for a quick and smooth start when released. Especially convenient for editing tape.

Dual Monitoring

Tape/Source Monitor Switch enables comparison of source signals with just records signals for more professional recording results.

Automatic Stop

The Tension Arm/Stop lever drops at the end of the tape, activating an automatic stop mechanism which completely stops reel movement for operating safety.

Individual Track Selectors for Monaural or Stereo Preformance

Recording mode can be effected using individual left or right channel selectors or both channels simultaneously. A Recording indicator Lamp lights to confirm recording mode.

Output Level Control Enables Connection with any Amplifier

An Output Level Control facilitates adjustment of output level to correspond with your amplifier input.

Tape Selector Switch

A Tape Selector Switch facilitates the use of Low Noise or Wide Range tape. While high performance low noise tape is standard for this machine, the ability to use wide range tape further extends high range frequency response.

Feather Touch Controls for Smooth and Easy Mode Selection

VU Meter Scales Extended to +5 VU for Precise level Indication.

 

Specifications

Track System:  4-track, 2-channel stereo/monaural system

Reel Capacity:  up to 7" reel

Tape Speed:  7-1/2 and 3-3/4 ips (±0,7%)

Wow and Flutter:

At 7-1/2 ips :  less than 0,06% RMS

At 3-3/4 ips :  less than 0,09% RMS

Frequency Response (using Akai LN-150-7 Tape)

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

At 3-3/4 ips :  30 Hz to 19,000 Hz (±3 dB)

Distortion:  less than 0,5% (1,000 Hz, "0" VU)

Signal-to-Noise Ratio better than56 dB (measured via tape with peak recording level of +6 VU)

Erase Ratio:  better than 70 dB

Bias Frequency:  100 kHz

Heads :  6 - One each GX forward recording, GX reverse recording, GX forward playback, GX reverse playback, forward erase, and reverse erase head

Motors:  3 - One AC Servo motor for capstan drive, two eddy current motors for reel drive

Fast Forward and Rewind Time:  90 seconds using a 1200 ft tape at 60 Hz

Output Jacks

Line :  2x 0,775 V (0 VU) Required load impedance more than 20 k Ω

Phone : 1x 30 mV/8 Ω

Input Jacks

Microphone :  2x 0,25 mV/5 k Ω

Line :  2x 70 mV/150 k Ω

DIN Jack:  0,5 V/3 mV

Semiconductors:  38 Transistors; 26 Diodes

Power Requirements:  100 V to 240 V 50/60 Hz

Power Consumption:  80 W

Dimensions (W x H x D):  441 x 404 x 207 mm (7,4" x 15,9" x 8,2")

Weight:  16,6 kg (36,5 lbs)

Sansui SS-10 headphones

High-Fidelity Stereo Headphone Set

The virtues of being alone have long been underrated. Or ware until Sansui decided to do something really meaningful about it. Now enter the SS-10 stereo headphone set, affectionately dedicated to those purists to whom stereo is indeed a very personal experience, ideally savored in princely solitude, far from the maddening crowd. Equipped with newly developed mechanical two-way speakers, this truly high-fidelity set reproduces a wide range of frequencies from very, very low to ultra-high with uniform smoothness. Few other stereo headphones on the market today are so discreet and so solicitous of your undisturbed listening pleasure. The SS-10 "direct line" set offers a host of attractive features, including separate volume controls for each channel, identical left and right channel characteristics, and hand-sewn so comfortable that it's a very wise investment from that standpoint alone. But Sansui is also very understanding about the pleasures of stereo sharing, and providently thought to make the "direct line" convertible to a "party line". So that on those occasions when there's something special you'd like someone special to hear with you, the SS-10 has a two-meter long Y-shaped extension cord equipped with two jacks for connecting two sets of headphones. But whether used in solitude, or adapted for sharing, the SS-10 stands alone as today's best buy in stereo headphones.

 

Mechanical 2-Way Speakers

The unique, newly developed mechanical 2-way speakers of the SS-10 utilize large 8 cm, special cone papers for the low and middle range notes, and quality polyester diaphragms that also cover the high ranges. These enable the SS-10 to reproduce sound with an absolute minimum of intermodulation and harmonic distortion and a maximum of transparency and resolution.

Wide Frequency Range

Thanks to the mechanical 2-way speakers, the SS-10 reproduces a wide 20 to 20,000 Hz range of sound, from well-damped, powerful rich heavy bass comparable to that reproduces by large speakers, to delicate, transparent treble, all with exceptional smoothness.

Identical Channel Characteristics

The SS-10 is designed to minimize the difference in tonal quality and output sound pressure level between the left and right channels, enabling you to enjoy well-balanced stereo sound. Further, unlike speaker systems, a stereo headphone set completely separates the left and right channel sounds, so that the stereo separation is exceptional.

Separate Volume Controls

Equipped with a volume control on each ear pad, the SS-10 saves you the trouble of standing up and walking over to the amplifier each time you wish to adjust the sound volume. It;s especially convenient when you are sitting far away from the amplifier using the extension cord supplied.

Since the left and right channels can be separately adjusted , adjustment of stereo balance is also easily accomplished.

y-Shaped Extension Cord with Two Jacks

The SS-10 comes complete with a 2 meter long extension cord to let you relax away from the amplifier or tape deck. This cord is provided with two jacks for connecting two stereo headphones sets, so two persons can listen together.

Spiral Cord

The connection cord of the SS-10 is of the same curled spiral type as that used with telephones. Though as long as 3 meters, it never gets in your way.

Hand-Sewn Ear Pads

Made of specially-treated soft plastic, the SS-10's ear pads cover the ears very softly and do not exert uncomfortable pressure on the wearer. These comfortable pads seal out external sound and will not tire the wearer even after hours of continuous listening

Easy-to Use, Functional Design

The length of the head band can be freely adjusted to suit the size of the head or ear positions of each individual.

 

Specifications

Speakers:  80 mm (3-3/16") mechanical 2-way

Max. Input:  500 mW

Impedance:  8 Ω

Frequency Response:  20 - 20,000 Hz

Sound Pressure Level:  Over 110 dB

Cord Length:

Main Cord:  Spiral type 3 m (9,8 ft.)

Extension Cord: Straight type 2 m (6,5 ft.)

Weight:   625 grams (22 oz)

 

Sansui SS-100 headphones

Omni-Dynamic Stereo Headphones

Sansui gives stereo music listeners the rich bass of dynamic acoustic transducers as well as the wide frequency range and brilliant musical reproduction qualities of the electrostatic types in these all-new, smartly designed SS-100 stereo headphones.

"Omni" means that the diaphragms inside the comfortably fitting earpieces each distribute a uniform driving force over its entire flat surface, avoiding split vibrations. The low mass of each diaphragm also means less total harmonic distortion and less phase distortion - the same advantages you have with electrostatic drivers. But since the SS-100 design is essentially dynamic , no electrostatic adaptor or special amplifier is required, and you enjoy a natural yet powerful bass reproduction as well.

With the Sansui Omni-Dynamic SS-100, frequency response is flat over the entire musical spectrum from superlows to ultrahighs. Harmonic distortion is minimal, impedance is flat with no trace of peaks or dips, and your amplifier or receiver is shown off at its best without overstraining.

 

Omni-Dynamic Principle

These handsome, Sansui-exclusive headphones employ an omni-dynamic transducer (diaphragm) in each earpiece. The units are made of polyester film, stretched to a uniform tautness and contained between two anisotropic magnet plates (Fig.1.) On the diaphragm film is etched a voice coil pattern (Fig. 2) And each of the magnet plates has a field (Fig. 3) which, when activated by the plus and minus pulsations of the musical input signal, moves the diaphragm to end from based on Fleming's left-hand rule as applies to current flow in coils.

 

Driver Construction

Omni-Dynamic Driver

As they are very thin and low in mass, the diaphragms offer excellent transient characteristics over a wider frequency range than can those shaped as cones or domes. This means you have a flat response from the superlows to ultrahighs with any musical input signal. Omni-dynamic drive means, too, that all sections of the diaphragm surfaces move in linear piston motion, without split vibrations, thus reducing harmonic distortion and extending dynamic range.

Powerful Magnets

The anisotropic magnet plates in the SS-100 each have high magnetic density to afford the headphones the very high sensitivity (efficiency) of 94 dB/mW.

Optimum Amplifier Load

Since the impedance of these headphones is literally constant at all frequencies, your amplifier or receiver is asked only to deliver an optimum load, meaning that you are assured of the best sound quality from your unit

No-Adaptor Design

To drive the SS-100 simply plug in the provided jack at the headphone outlet on your amplifier or receiver. No AC power booster or other adaptor is required.

 

Fatigue-Free Design

Comfortable Wearing

Eight neoprene supports separate the earpiece from the headband assembly, increasing wearing comfort. The earpads are soft and slim-silhouetted for further comfort, and the recess inside each is shaped to optimize air compliance for better musical reproduction, even into the very high frequency range.

Clear Channel Identification

You'll never confuse front and back or left and right two clearly-marked arrows point to the front of the headset, and only the left earpiece has a cable cord, both for channel identification and wearing comfort.

Slim Design Throughout

Since these Sansui-exclusive Omni-Dynamic drivers themselves are flat, thin and compact, the earpieces have been designed to present a slim silhouette. other design elements take up this low profile motif to result in a modern and quite comfortable stereo headphone set you'll enjoy for long years of hard use.

 

Specifications

Speaker:  Omni-dynamic driver 67 mm (2-5/8)") full-range type

Matching Amplifier Impedance:  4 - 100 Ω

Impedance:  60 Ω  nominal

Frequency Response Range:  20 - 20,000 Hz

Total Harmonic Distortion :  less than 0,3% (at 94 dB SPL)

Max. Input Power:  250 mW

Sensitivity:  94 dB/mW (at 200 Hz)

Cord Length:  2 m (6,5 ft) coiled

Weight (Headphones only):  380 g (13,2 oz)

 

Sony APM-66ES speakers

Reference quality speakers with Sony's unique APM flat driver technology for sonic performance that fully meets the demands of digital audio.

Extremely uniform, extended frequency response for superb tonal accuracy and smooth, untiring sound.

Low distortion and coloration not possible with conventional cone drivers.

Near-perfect linearity over a wide dynamic range

Advanced crossover design for smooth response and stable stereo imaging over entire frequency range

Heavy-duty cabinet construction with rounded edges for reduced diffraction effects.

 

Features

The APM-66ES's flat diaphragm is a very lightweight but very rigid honeycomb sandwich structure whose pistonic motion moves air very efficiently.

The 424 cm² woofer reproduces a powerful bass

The acoustically rounded enclosure improves directivity characteristics by minimizing the diffraction effect.

 

Specifications

Speaker System:  3-way speaker system

Nominal Impedance:  6 Ω

Power Handling Capacity (DIN 45500):  100 W (Nominal); 200 W (Maximum)

Sensitivity:  89 dB (1 W, 1 m) [DIN 45500 5 W (96 dB, 1 m)]

Frequency Range:  30 Hz - 30,000 Hz

Crossover Frequency:  600 Hz and 4,500 Hz

Speaker Units;

Woofer :  424 cm² (66 in²), APM type

Midrange :  48 cm² (7,4 in²), APM type

Tweeter :  9 cm² (1,4 in²), APM type 

Enclosure Type:  Bass reflex type, Removable front grille

Finish:  Grained vinyl of Walnut

Volume:  56 litres

Dimensions (W x H x D):  380 x 660 x 365 mm (14" x 26" x 14-3/8") including front grille

Weight:  26 kg (57 lb 6 oz)  including front grille, ( net per speaker)

 

Toshiba SC-410 amplier

4-channel QM Decoder/Amplifier

Features:

Decodes almost any type of encoded matrix 4-channel discs at four modes of 4-channel effect

Decodes 4-channel programs from ordinary non-encoded discs into quasi-quadraphonic stereo sound

Built-In IC power amplifier for two sets of rear channel speaker systems

Connectable to any type of stereo amplifier furnishing DIN socket and PIN "pre-out/in" jack

 

Specifications

Power Output:  30 W rms into 8 Ω  at 0,8% T.H.D.

Frequency Response:  20 - 40,000 Hz (exclude QM section)

Power Bandwidth:  20 - 40,000 Hz (exclude QM section)

Semiconductors: 

2 Transistors for AF amplifier;

1 Diode for power supply;

2 ICs (TH-9015P's) for power output section;

4 FET's and 4 Transistors for QM decoder

Control:

Main volume, sub volume, selector 2-ch/4-ch/tape/aux; Power off; speaker A & B, QM effect (concert hall/studio/surround/stage0; Hi-cut

Jack and Terminals:

DIN socket, input/output jack, AC unswitched outlet, speaker terminal

Dimensions (W x H x D):  300 x 115 x 385 mm (11-3/4" x 4-1/2" x 15")

Weight:  6 kg (13-1/4 lbs)

 

Toshiba SS-100 speakers

Concave Speaker System

Features:

Crystal, full-bodied bass reproduction from big 30 cm (12") concave woofer

Unusual mid-range tonal response from 22 cm x 11 cm (8" x 4") exponential horn type squawker

Clear, lifelike high tone rendition from 6 cm (2,5") horn tweeter with acoustic lens,

Switch and input terminals for electronic crossover multi-amplifier system

 

Specifications

Enclosure:  Pressure balance type

Mounted Speakers:

Woofer :  300 mm (12") concave

Mid-range :  220 x 110 mm (8" x 4") horn

Tweeter :   60 mm (2-1/2") horn with acoustic lens

Frequency Range:  30 - 20,000 Hz

Crossover Frequency: 

Low-Mid-range :  700 Hz,

Mid-range _ High :  5,000 Hz

Power Handling Capacity:  60 W (max)

Impedance:  8 Ω

Sensitivity:  92 dB /IEC

Fundamental Resonance Frequency:  40 Hz

Timber Control:  Mid & high each 4-step 6 dB

Multi-amp Connection:  2 & 3 way

Front Panel:  Removable

Dimensions (W x H x D):  490 x 790 x 441 mm (19-1/4" x 31-1/8" x 17-3/8")

Weight:  43 kg (95 lbs)

 

JVC CD-1770 cassette deck

For people who prefer to place their decks on an open shelf or table, the CD-1770 has the time-tested top-load design. Its reliable tape transport mechanism offers a low wow and flutter of only 0,12% (DIN 45 500) or 0,04% (WRMS). JVC's own ANRS/Super ANRS noise reduction systems. SA (Sen-Alloy) record/playback head, 5-LED Multi-Peak indicator and other numerous technical features assure exceptional versatility and dependable performance.

 

Finest Tape Transport.

The exceptionally low 0,12% (DIN 45 500) wow and flutter in this fine deck is mainly credited to the use of a frequency controlled DC servomotor. It provides more stable and higher torque and less speed deviation than AC-operated motors. A dual-belt independent Drive Mechanism, another JVC-exclusive is also used to drive the capstan and the tape reels separately, thus preventing the vibration of the tape reels from affecting the capstan revolution. This further assures exceptional speed accuracy at all times.

 

Versatile Recording Aids

The CD-1770 offers JVC's 5-LED Multi-Peak Indicator in Addition to a pair of large level meters. This Indicator responds even to pulse-like peak signals of very short durations. Using the indicator and the level meters together will enable you to adjust the recording levels to the maximum and avoid distortion. There also are two pairs of recording level controls for MIC (DIN) and Line, to let you mix microphone signals with line inputs from any programme source of your choice.

Convenience Features

Memory Tape Counter for memory stop. Air-damped cassette compartment lid. Full automatic stop, illuminated cassette compartment for easier tape inspection Six push-button Bias and Equalizer selectors to obtain maximum performance from any kind of tape. Timer Standby facility.

 

Specifications

Heads:

Record/Playback :  Sen-Alloy Head

Erase :  Two-Gap Ferrite Head

Motor:  Frequency-Controlled  DC Servo Motor

Fast Forward / Rewind Time:  75 sec. (with C-60 cassette)

Bias and Erase System:  AC-95 kHz

Frequency Response  (typical)

Chrome Tape :  30 - 16,000 Hz

Normal Tape :  30 - 16,000 Hz

Signal-to-Noise Ratio:  56 dB (from Peak Level Weighted) without ANRS. The S/N is improved by 5 dB at 1 kHz and 10 dB above 5 kHz with ANRS on

Wow and Flutter:  0,04% (WMRS); 0,12% (DIN 45 500)

Crosstalk:  65 dB (1 kHz)

Channel Separation:  35 dB (1 kHz)

Total Harmonic Distortion :  1,2%

Input Sensitivity/Impedance

Mic  :  0,2 mV/600 - 10 k Ω

Line In  :  80 mV/470 k Ω

DIN :  0,17 mV/k Ω 

Output Level/Impedance

Line Out  :  0-500 mV/6.8 k Ω

Headphone :  0-0,3 mW / 8 - 1 k Ω

DIN :  0-500 mV/6.8 k Ω

Power Supply:  120 / 220 / 240 V, 50/60 Hz

Power Consumption:  5 watts

Dimensions (W x H x D)):  426 x 126 x 277 mm (16-3/4" x 4-15/16" x 10-7/8")

Weight:  5,5 kg  (12,1 lbs)

 

JVC KD-720 cassette deck

Features:

Separate Bias/EQ Switches

Full Automatic Stop Mechanism

Slanted Operation Panel

A High Value Investment in Hi-Fi

The Dolby noise reduction system, a popular and widely used feature, is incorporated in the JVC KD-720 to effectively reduce tape hiss. Then, since we provide separate Bias/EQ Tape Select switches on this high-value deck, you are assured of an outstanding dynamic range and a wide frequency response from any tape you use.

For tape protection, the KD-720's Full Auto-Stop mechanism automatically shuts itself off several seconds after a tape reaches its end in any mode. Reliability and durability are much improved over those of conventional mechanical type stop devices. This new and special JVC mechanism uses a reed switch and a rotating magnet.

The control panel is slanted to facilitate operation and improve visibility of VU meters, controls and tape running Level controls are easy-to-adjust sliders, while Vus are large for easy adjustment.

 

Specifications

Heads:

Record/Playback :  Cronios Head

Erase :  Two-Gap Ferrite Head

Motor:  Electronic Governor DC Motor

Fast Forward / Rewind Time:  85 sec. (with C-60 cassette)

Bias and Erase System:  AC-95 kHz

Frequency Response  (typical)

Chrome Tape :  40 - 15,000 Hz

Normal Tape :  40 - 14,000 Hz

Signal-to-Noise Ratio:  56 dB (from Peak Level Weighted) without Dolby. The S/N is improved by 5 dB at 1 kHz and 10 dB above 5 kHz with Dolby on

Wow and Flutter:  0,07% (WMRS); 0,17% (DIN 45 500)

Crosstalk:  60 dB (1 kHz)

Channel Separation:  35 dB (1 kHz)

Total Harmonic Distortion :  1,3%

Input Sensitivity/Impedance

Mic  :  0,4 mV/600 - 10 k Ω

Line In  :  80 mV/470 k Ω

DIN :  0,14 mV/k Ω 

Output Level/Impedance

Line Out  :  390 mV/4 k Ω

Headphone :  0,3 mW / 8 - 1 k Ω

DIN :  390 mV/4 k Ω

Power Supply:  120 / 220 / 240 V, 50/60 Hz

Power Consumption:  5 watts

Dimensions (W x H x D)):  390 x 128 x 250 mm (15-3/8" x 5" x 10")

Weight:  3,6 kg  (8 lbs)

 

JVC DD-9 cassette deck

Direct-Drive Cassette Deck. The Performance Approaching Open-Reel Quality

The JVC DD-9 is truly a deck worthy to be termed "professional", if there ever was one. Thanks to our own JVC-manufactured quartz-lock Pulse Servo motor, we've succeeded in practically eliminating wow/flutter; it's only 0,055% (DIN 45 500), the lowest figure ever achieved in a consumer cassette deck. This and other features help you get the highest level of performance - open-reel quality recording performance - from the compact cassette format.

Direct-Drive plus quartz-lock Pulse Servo motor equals (0,055% wow/flutter)

By linking our capstan directly to the motor shaft, we've eliminated all the linkages - belts, cams, pulleys, etc. - found in lesser decks that can create unwanted speed variations known as Wow and Flutter. The low-rpm motor, designed and manufactured by JVC, is used for capstan drive, it has completely eliminated tiny rotational fits and starts known as "cogging" that can audibly tarnish musical reproduction. A quartz-referred servo circuit has been added so that absolute speed accuracy is impeccable.

Computerized B.E.S.T. tuning system - the matchmaker

You can obtain flat response from 40 to 12,500 Hz with a tolerance of only ±1 dB, using just about any tape, all at the touch of a button. The built-in computer matches deck parameters - bias, equalization, and sensitivity - for each specific tape. Distortion and dynamic range are both optimized.

 

 Three-head design specially configured for B.E.S.T.

As you tune the deck to the tape, you can actually attest to the system's effectiveness, for the DD-9 has separate record and play heads (JVC X-cut SA combination Rec/Play heads), allowing you to monitor the tape while you're recording. You can also witness the unusually extended highs, for each head is given an optimized gap.

Dolby C-type noise reduction: Inaudible hiss and distortion free "hot" passages

The newest circuitry from Dolby Laboratories is incorporated in the DD-9 - Dolby C-type noise reduction. At high frequencies, noise (hiss) is reduced by an additional 10 dB (to a full 20 dB of noise reduction)

Two-colour digital fluorescent level meters with peak-hold function.

They are electronically accurate and have a peak-hold function so that instantaneous transients may be analysed for proper level setting during recording.

Other features:

Two-motor full-logic control transport

Touch input volume control

Convenient Memory and Auto Rewind functions

DC amps

Lockable timer standby

Output level control adjusts headphone level as well

Recording mute, Output level control, Optional remote control (R-50E)

 

Specifications

Type: Compact cassette tape deck, 2-channels stereo

Heads:

Record/Playback :  Combination X-Cut Sen-Alloy Head

Erase :  Two-Gap Sen-Alloy Head

Motors:  Quartz-Lock Pulse Servo Motor and DC Motor

Fast Forward / Rewind Time:  85 sec. (with C-60 cassette)

Frequency Response  (at -20 VU)

Metal Tape :  25 - 18,000 Hz (±3 dB) [40 - 12,500 Hz ±1 dB]

SA/Chrome Tape :  25 - 18,000 Hz (±3 dB) [40 - 12,500 Hz ±1 dB]

Normal Tape :  25 - 17,000 Hz (±3 dB) [40 - 12,500 Hz ±1 dB]

Frequency Response  (at 0 VU)

Metal Tape :  25 - 12,500 Hz (±3 dB)

SA/Chrome Tape :  25 - 8,000 Hz (±3 dB)

Signal-to-Noise Ratio:  60 dB (Metal)

Wow and Flutter:  0,055% (DIN 45 500)

Crosstalk:  65 dB (1 kHz)

Channel Separation:  40 dB (1 kHz)

Total Harmonic Distortion (0 VU, 1 kHz) :  1,0% (Metal)

T.H.D. K3 (0 VU, 1 kHz) :  0,4% (Metal)

Input Sensitivity/Impedance

Mic (x2) :  0,2 mV/600 - 10 k Ω

Line In (x2) :  80 mV/100 k Ω

Output Level/Impedance

Line Out (x2) :  0 -500 mV/5 k Ω

Headphone :  0 -0,6 mW (Matching Impedance 8 - 1 k Ω )

Power Supply:  120 / 220 / 240 V, 50/60 Hz

Power Consumption:  40 watts

Dimensions (W x H x D)):  450 x 110 x 325 mm

Weight:  8,4 kg

 

Quad 405-2 power amplifier

More than 60,000 Quad 405 current dumping amplifiers are in use around the world providing the "closest approach to the original sound" in the homes of serious music listeners, in recording and broadcasting studios and for sound reinforcement where quality is of prime importance.

The Quad 405-2 exploits improvements in component technology to provide more VA into a wider variety of loads than the original Quad 405 without compromising performance and reliability.

The Quad 405-2 will produce perceptibly higher sound pressure levels from the majority of loudspeakers than the original Quad 405, which will be of significant benefit with the increased dynamic range of modern programme sources.

The 405-2 uses "current dumping", a Quad invention based on feedforward error correction which eliminates many of the problems traditionally associated with transistor amplifiers.

"feedforward error correction" was first proposed by Harold Black in 1928, in which a derived error signal is added to the output signal of an amplifier in exactly the right amount to cancel the distortion produced by the amplifier. While it is relatively easy to add error current to signal current without interaction, as in Black's invention, it is very much more difficult to do so in voltage terms. Loudspeakers require a stiff source and so "feedforward" has found no successful application in audio amplifiers.

What Quad has done - not quite as easy as it sounds - is to produce a current controlled amplifier, apply a special type of feedforward current error correction and then apply overall voltage feedback to convert the whole to a voltage amplifier. There is in effect, both a low powered very high quality amplifier and a high powered heavy duty amplifier, the current dumpers. The low power amplifier controls the loudspeakers at all times, calling upon the high power section to provide most of the muscle. The small amplifier which carries the error signal is so arranged that provided the large power transistors get within the target area of the required output current, it will fill in the remainder accurately and completely.

The quality is solely dependent upon the performance of the low powered high quality amplifier together with four passive components. When correctly designed, all distortion in the output stage is reduced to zero.

With this technique it is possible to produce an amplifier of very high performance without using carefully matched relatively fragile output devices. There are no crossover biasing problems, no alignment or adjustment is required to obtain optimum performance and nothing can go out of alignment during life. In the event of component failure, replacement can be effected and performance restored without realignment.

 

Specifications

Power Output:  the amplifier is intended for use with loudspeakers of 4 - 16 Ω  nominal impedance.

Power and distortion for various frequencies

Continuous sine wave into 8 Ω , resistive load

100 Hz any level up to 100 watts : less than0,01% Dtot

1,100 Hz any level up to 100 watts : less than0,01% Dtot

10,100 Hz any level up to 100 watts : less than0,05% Dtot

Output Internal Impedance and Offset:  3,3 µH is series with 0,03 Ω . Offset 7 mV max

Frequency Response:

Ref. 1 kHz

Low frequency -1 dB at 20 Hz. Filter attenuation as curve.

High frequency -0,5 dB 20 kHz -3 dB 50 kHz

Signal Input Level:  0,5 V rms ±0,5 dB for 100 watts into 8 Ω . Amplifier loads th input by 20 k Ω  in parallel with 220 pF

Signal Input Slew rate Limit:  0,1V/µS.

Provided the rate of change of input voltages does not exceed this figure which is about ten times the maximum slew rate on a gramophone record and the amplifier is not driven into clipping, then the total of all distortions appearing in the audio range (20 - 20,000 Hz) due to transient or repetitive waveforms with frequency components inside or outside the audio range will be at least 80 dB below full rated power. If the major portion of the input energy is wanted signal then -80 dB (0,01%) represents the maximum possible distortion on programme.

Signal Input Overload:  Instantaneous recovery up to =20 dB overload

Crosstalk (Input loaded by 1 k Ω ):

80 dB at 100 Hz

70 dB at 1 kHz

60 dB at 10 kHz

Hum and Noise:

"A" Weighted:  -96 dB ref full power

Unweighted:  -93 dB ref full power

(15,7 kHz measurement bandwidth)

Protection

The Quad 405-2 is suitable for use under the most arduous music conditions and is electrically protected by current limiters; 8,5 ampers peak current into any load reducing to 3,1 amperes steady state into a short circuit. Shorting both outputs simultaneously for an extended period will result in overheating and eventual breakdown

Stability: Unconditionally stable with any load and any signal

Power Input:  100-120-130 V, 220-230-240 V 50/60 Hz, 30 - 350 watts depending on signal level

Dimensions (W x H x D):  340 x 115 x 195 mm (13,4" x 4,5" x 7,7"). Allow an extra 38 mm (1,5") for plug and socked

Weight:  9 kg (20 lbs)