Akai GX-210D reel-to-reel tape deck

Three Motor Automatic Reverse Stereo Tape Deck

GX-210D features 3-motor drive mechanism includes self-lubricating Hysteresis Synchronous Motor

To match the lasting performance of the GX Head, the GX-210D is equipped with Akai's unique self-lubricating capstan motor. The installation of two oil circulating mechanisms with cellulose fibres within the interior of the motor provides long lasting, trouble-free operation. Oil circulating speed is adjusted naturally according to motor revolutions and temperature, and because shaft rotation is always smooth and stable, various mechanical troubles resulting from oil circulation suspension do not occur. Further, these unique cellulose fibres also function as filters to keep the oil clean during the circulating process, adding to the motor's epoch-making longevity. Two highly efficient outer-rotor motors for supply and take-up reel drive assure consistent and smooth tape travel and ideal starting torque.

Other features

Automatic and Manual Reverse Playback

Akai's Exclusive Glass and X'tal Ferrite heads

Self-Lubricating Hysteresis Synchronous Capstan Drive Motor

Reel Drive Outer-Rotor Motors

Sturdy 2-Lever Control System

Instant Tape/Source Monitoring

Tape Selector for High Performance Low Noise Tape

Automatic Stop and pause Control

4-Digit Index Counter for Easy Indexing

Built-in Reel Retainers

 

Specifications

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

Tape Speeds

7-1/2 ips (19 cm/sec) ±0,8%

3-3/4 ips (9,5 cm/sec) ±1%

Wow and Flutter

7-1/2 ips :  less than 0,08% (*0,12%) RMS

3-3/4 ips :  less than 0,12% (*0,25%) RMS

Total Wow and Flutter:  less than 0,18% RMS at 7-1/2 ips (Scotch #175 tape, 3,000 Hz recording and playback)

Frequency Response

S.R.T. Tape

7-1/2 ips :  30 to 25,000 Hz ±3 dB

3-3/4 ips :  40 to 20,000 Hz ±3 dB

Regular Tape

7-1/2 ips :  30 to 23,000 Hz ±3 dB

3-3/4 ips :  40 to 18,000 Hz ±3 dB

Total Harmonic Distortion:  less than 1,5%

Output Line :

1,228V (4 ±1 dB) at FWD mode, using a 250 Hz 0VU pre-recorded tape

1,228 V (4 ±1,5 dB) at REV mode, using a 250 Hz 0 VU pre-recording tape

Output DIN :  610 mV (-2 dB) using a 250 Hz 0 VU pre-recorded tape

Inputs

Mic :  better than 0,3 mV

Line :  better than 60 mV

DIN :  better than 5 mV (Low); 60 mV (High)

Recording/Playbackl Level: 1,228 V (4 ±1,5 dB ) at 7-1/2 ips 1,000 Hz 0 VU recording

Signal-to-Noise Ratio:  better than 50 dB (7-1/2 ips); better than 47 dB (3-3/4 ips)

Total Signal-to-Noise Ratio:  better than 47 dB at 7-1/2 ips

Crosstalk:  better than 45 dB

Erase Ratio:  better than 70 dB

Recording Bias Frequency:  102 kHz ±5%

Bias Leak:  less than -30 Vu

High Frequency Deviation

Between FED Channels :  within 3 dB

Between REV Channels :  within 4 dB

Between FWD-REV :  within 3,5 dB

Reversing Time :  2 to 3 seconds

Recording Capacity :  45 min. Stereo recording using a 1,800 ft tape at 7-1/2 ips

Fast Forward and Rewind Time:  110/90 sec. Using a 1,800 ft tape at 50/60 Hz

Motors

Capstan Motor :  2 speed Hysteresis Synchronous Motor

Type  :  HM2-16MC (winterized) 4-8 pole

Revolutions :  1,500/1,800 rpm at 50/60 Hz

Reel Motor :  Two 6-pole eddy current outer rotor motor

Type :  24XO-MR

Revolutions :  930/1,120 rpm at 50/60 Hz

Heads

Combo Recording/Erase Head

Type :  RE4-6 GX head

Gap :  3,5 to 5,5 micron (REC); 0,2 mm W Gap (Erase)

Impedance :  1,400 Ω  ±25% at 100 kHz (REC)

130 Ω  ±7% at 100 kHz (Erase)

DC Resistance :  5,5 Ω  (REC); 2,3 Ω  (Erase)

Playback Head

Type :  P4-202 GX Head

Gap :  1,2 to 2,2 micron

Impedance :  1,400 Ω  at 1,000 Hz

DC Resistance :  268 Ω

Semiconductors:  29 Transistors; 15 Diodes; 3 Zener Diodes

Power Requirements:  100 to 120 V, 220 to 240 V AC 50/60 Hz

Power Consumption:  100 W max

Dimensions (W x H x D):  368 x 371 x 227 mm (14,5" x 14,6" x 8,9")

Weight:  15,4 kg (33,9 lbs)

 

Akai 1730D-SS reel-to-reel

4-channel / 2-channel Stereo Tape Deck

An entirely new world of sound has been created by Akai's electronics engineers who have developed a new and sophisticated line of 4-channel surround stereo equipment. Included in this line are the exciting 1730D-SS 4-channel/2-channel Stereo Tape Deck and 1730-SS 4-Channel/2-Channel Stereo Tape recorder.

With either system, you're completely surrounded in sound with four speakers, left and right in front, and left and right in the rear. This system gives you a real "sense of presence", the feeling of being exactly in the middle of a live performance. Both models are designed to be used for not only 4-channel stereo but also 2-channel stereo as well.

The 1730D-SS is perfectly matched with Akai's exclusive AA-6100 amplifier. this amplifier has 80 W music power for dynamic 4-channel stereo sound and accommodates both 4-channel and 2-channel stereo operation.

 

Akai's dependable 2-lever system complements the high grade parts and robust construction of this rugged 4-channel/2-channel stereo model

It is regular practice to employ mechanical control in one-motor tape decks.  Akai has long since employed this 2-lever system in our one-motor decks. When compared to an ordinary 1-lever system, because the Play/Rec and F.Fwd/Rew Levers are independent, the movable range of the levers are shorter, and operation is lighter. Also, because the F. Fwd/Rew Lever is separate, mis-operation is minimized. Further, because of the mechanical structure of this control system, other parts are not unfavourably influenced and mechanism endurance is extended. Rectangular shaped Control Panel with proportionately balanced controls.

4-Head System

Durable 2-Lever Controls for Extra Dependability

Instant tape/Source Monitoring

Newly Designed Slanted Control Panel for Easy Operation

Front and Rear Channel Headphone jacks for Easy Monitoring or Private Headphone Listening

Automatic Stop and Shut-Off

4-Digit Index Counter

Built-in Reel Retainers

Pause Control

 

Specifications

Recording System:  In-line 4-track, 4-channel stereo and 4-track 2-channel stereo recording

Playback System:  In-line 4-track, 4-channel stereo and 4-Track, 2-channel stereo playback

Tape Speed:  3-3/4 and 7-1/2 ips

Speed Deviation:  within ±1,5% at all speeds

Reels:  7", 5"  reels can be used

Wow and Flutter:

7-1/2 ips :  less than 0,15% rms

3-3/4 ips :  less than 0,2% rms

Frequency Response

7-1/2 ips :  30 to 22,000 Hz ±3 dB

4-3/4 ips :  40 to 13,000 Hz ±3 dB

Signal-to-Noise Ratio:  better than 48 dB

Total Harmonic Distortion

Line Output :  within 2% at 1,000 Hz 0 VU recording

Main Output :  within 3% at 1,000 Hz 5W (8 Ω )

Crosstalk: less than -50 dn (track) -40 dB (channel)

Erase Ratio:  less than 70 dB

Insulation Resistance: better than 50 MΩ

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

Line Output:  +4 dB ±1,5 dB (1,228 V), at 0 VU indication, 250 Hz 0 VU recorded Tape. Required load impedance more than 25 k Ω

DIN Output:  -6 dB ±1,5 dB when using a 250 Hz recorded tape. Required load impedance more than 50 k Ω

Line Input:  above 40 mV/ 330 k Ω

Mic. Input :  above 0,4 mV/30 k Ω

DIN Input :  above 20 mV/100 k Ω

Fast Forward and Rewind Time: 

90 sec. 1,200 ft. Tape at 50 Hz

70 sec. 1,200 ft. Tape at 60 Hz

Motor:  Hysteresis synchronous 2 speed motor

Horse Power :  1/100 HP

Power Ratio :  85%

Revolutions :  3,000 to 1,800 RPM (at 50 Hz); 3,600 to 1,800 RPM (at 60 Hz)

Condenser Capacity:  3 µF (at 50 Hz); 2 µF (at 60 Hz)

Heads

Recording:  In-line 4-track 4-channel stereo (4-track 2-channel stereo)

Impedance :  125 Ω  ±20% at 1,000 Hz

Gap :  4/1,000 mm

Playback :  In-line 4-track 4-channel stereo (4-track 2-channel stereo)

Impedance :  1,200 Ω  ±15% at 1,00 Hz

Gap :  2/1,000 mm

Erase head :  In-line 4-track 2-channel stereo

Impedance :  195 Ω  ±10% at 100 kHz

Erase Head :  In-line Full track

Impedance :  350 Ω  ±10% at 100 kHz

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

Power Consumption:  55 W

Dimensions (W x H x D):  420 x 450 x 240 mm (16,5" x 18" x 9,5")

Weight:  17 kg (37,5 lbs)

 

Akai GXC-325D tape deck

Dual Monitoring Cassette Stereo Tape Deck

With taped music, as in five card stud, you'll always get the results you want when you play with a deck that always delivers what you want. Take this deck, one of the new cassette decks from Akai.

The GXC-325D. It comes stacked with features to make your music sound clearer, and richer. It has a three head function, with separate recording and playback heads for wider frequency response. It comes with a closed loop double capstan, which maintains proper back tension, and perfect tapw and head contact.

 

The recording and playback heads of this new 3-head system are Akai's revolutionary GX Heads and are joined for perfect parallelism of recording and playback head gaps. This combined with the Closet Loop Double Capstan system and AC Servo Motor of this model clearly makes it the leader in the field of cassette recording.

Two each capstans and pinch rollers are used, one each of which is positioned in parallel at either side of the head block for stable tape speed and tape tension. This shuts out the adverse influence from outside the "closed" area between capstans so that there is no tape vibration and head-to-tape contact is perfect. Some of the other merits of this system include:

Perfect tracking and the elimination of azimuth alignment adjustment mechanisms, beacons, etc.

Better Signal-to-Noise Ratio and a wider dynamic range

Wow and Flutter reduced to 0,55% WRMS and sound drop-out minimized

3-head system facilitates Dual Monitoring and because of head portioning, there is no time lag between recording and playback signals during monitoring

Intermodulation suppressed for clearer playback

C.P.G. [Center Pole Frequency Generated] system of AC Servo Motor results in greater inertia and increassed output for extremely quiet operation and accurate motor revolutions

Performance not influenced by cassette unevenness

Completely stable operation and incomparably clear recording and playback tone quality

Lasting new machine performance

 

Features:

New 3-Head Cassette System

Individual recording/Playback Glass & X'tal Ferrite Heads

Closed-Loop Double Capstan Drive Mechanism

Amazingly Low 0,055% WRMS Wow and Flutter

Newly Designed C.P.G. AC Servo Motor

Akai's exclusive A.D.R. Plus Double Process Dolby Noise Reduction System

Memory Rewind

Peak Level Indicator

Limiter Circuit Prevents Over-Level Recording

Instantaneous Full Release Automatic Stop

Output Level Control Mic/Line Mixing

Tape Run Indicator

Self-Lock Pause Control

Direct Function Change Control

 

Specifications

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

Tape Speed:  1-7/8 ips

Wow and Flutter:  0,055% WRMS

Frequency Response:

Low Noise Tape :  30 Hz to 15,000 Hz (±3 dB)

CrO₂ Tape :  30 Hz to 16,000 Hz (±3 dB)

Fe-Cr Tape :  30 Hz to 19,000 Hz (±3 dB)

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

Signal-to-Noise Ratio:  better than 51 dB (measured via tape with peak recording level of +5 VU. Dolby switch On, Improves up to 10 dB above 5 kHz)

Erase Ratio:  Better than 70 dB

Bias Frequency:  100 kHz

Heads:  three head system includes One Glass and Crystal Ferrite Rec/Power Bandwidth, combination head, and One Ferrite Erase head

Motors:  AC servo outer rotor motor

Fast Forward and Rewind Time:  75 sec. (C-60 cassette Tape)

Output jacks:

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

Phone :  30 mV/ 8 k Ω

Input Jacks:

Microphone :  0,3 mV/8 k Ω

Line :  70 mV/100 k Ω

DIN Jack:  0,775 V/2 mV

Semiconductors:  60 Transistors; 51 Diodes: 4 FET's; 1 IC.

Power Requirements:  110 to 120 V , 220 to 240 V, 50/60 Hz

Power Consumption:  30 W

Dimensions (W x H x D):  442 x 142 x 301 mm (17,4" x 5,6" x 11,9")

Weight:  8,6 kg (18,9 lbs)

 

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)

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

 

JVC KD-95 cassette tape deck

The best of JVC's new lineup of high-performance cassette decks, the KD-95 features nearly all the JVC exclusives introduced on preceding pages. Its electronics and mechanism are truly sophisticated and provide the widest dynamic range, lowest distortion and least noise yet achieved in a stereo cassette configuration. Its outstanding specifications are ample evidence of a JVC engineering triumph.

 

Mechanical Accuracy

The JVC KD-95 employs two motors - a precision frequency-generator (FG) servomotor for capstan drive and a DC motor for reel drive, all operations are undertaken electronically by the JVC developed TTL (Transistor-Transistor Logic) IC which activates three electromagnetic plungers; a light touch of any control button allows you to move from one mode to another without having to go through Stop. Also, the deck's large flywheel - 80 mm in diameter - is coupled to the capstan to help reduce wow and flutter. And finally, a professional touch has been added to the KD-95; its head assembly has screws which allow the user to adjust the head azimuth, height and tilt.

 

Sophisticated Electronics

We used the best of JVC electronics technology in designing our top-of-the-line KD-95. first, its recording amp is formed of the 2-stage direct-coupled NPN configuration featuring high linearity. Second, its equalized circuit is of the DC feedback type for excellent transient characteristics and unmuddiet lows. Third, convenient Recording Equalizer and 400 Hz Signal Oscillator circuits are included.

 

Recording Conveniences

Inn JVC's "Real Time" pause mechanism, the heads are in contact with the tape even in the pause mode. The Timer Standby facility inside the KD-95 permits repeated, interrupted record and play - a feature rarely found on cassette decks. Also offered are two recording circuits, one for Mic/DIN input and the other for Line input, which allow you to mix microphone sounds with other sources. Plus a pair of rack-mounting brackets, which is a standard accessory in every KD-95.

 

Specifications

Type:  Stereo cassette deck

Track System:  4-track, 2-channel

Cassettes:  C-30; C-60; C-90

Frequency Response:

Chrome Tape

Nominal :  20 - 18,000 Hz

Typical :  30 - 16,000 Hz

SF Tape

Nominal :  20 - 17,000 Hz

Typical :  30 - 15,000 Hz

Signal-to-Noise Ratio:  56 dB (from peak level, weighted)

The Signal-to-Noise Ratio is improved by 5 dB at 1 kHz and by 10 dB above 5 kHz with ANRS On

Effect of ANRS (Normal Tape)

Improvement of SN :  the same with ANRS

Improvement of Frequency Response :  6 dB at 10 kHz (0VU recording); 12 dB at 10 kHz (+5VU recording)

Improvement of Distortion : 3% at 10 kHz (0VU recording)

Wow and Flutter:  0,05% (WRMS); ±0,2% (DIN 45500)

Crosstalk:  65 dB

Harmonic Distortion:  1,2 %

Bias:  AC bias (95 kHz)

Erasure:  AC erasure (95 kHz)

Heads:

Recording/Playback :  Sen-Alloy head

Erasure :  Double gap, Ferrite head

Motors:

1 x FG servo DC motor

1 x DC motor

Tape Speed:  4,8 cm/sec

Fast Forward and Rewind Time:  90 sec. With C-60 cassette

Playback Equalizer Time Constant

Normal/SF Tape :  3180 µs/ 120 µs

CrO₂ Tape :  3180 µs/ 70 µs

Semiconductors:  8 ICs; 88 Transistors;  71 Diodes

Input Terminals

Mic Jack (sensitivity/Impedance):  0,2 mV/600 Ω  - 10 k Ω

Input Jack (level/impedance) :  78 mV/100 k Ω

Output Terminals

Output Jack (level/Impedance) :  0 - 0,5 V / 2 - 7 k Ω

Matching Load Impedance :  50 k Ω  or more

Headphone Jack (level/impedance) :  0,6 mW/ 8 Ω  - 1 k Ω

DIN Socket

Min. Input Level :  0,1 mV /k Ω

Input Impedance :  11 k Ω

Output Level :  0 - 0,5 V

Output Impedance :  2 - 7 k Ω

Matching Load Impedance :  50 k Ω  or more

Power Requirements:  AC 100, 120, 220, 240 V 50/60 Hz

Power Consumption:  35 W

Dimensions (W x H x D):  420 x 211 x 321 mm (16-1/2" x 8-1/4" x 12-5/8")

Weight:  11 kg (24,2 lbs)