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Sound Rating: 7 / 10 # Owners: 1
Relaibility Rating: 8 / 10 Views: 482

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Technical Details

Brand: Sony

Model:TC-788-4 Quadradial

Category:Mid High Fidelity


Electronics:Solid State


Country of Manufacture:Japan

Release dates:1978 - 1982

Original Price: $1595

Tracks:1/4 Rec/PB

Speeds: 7 1/2, 15

Max Reel Size("): 10.5"

Number of heads: 3

Dimension: 22 x 17½ x 8¾ " (559 x 444.5 x 222 mm)

Head Composition: Permalloy

Head Configuration: Quad

# Motors: 3

Auto Reverse?:No

Voltage(s): 110-120v

Frequency Response:( 3dB): 15 ips: 30Hz - 22kHz (standard tape). 30Hz - 28 kHz (SLH tape) 7½ ips: 30Hz - 17kHz (standard tape). 30Hz - 23 kHz (SLH tape)

Wow and Flutter:0.04% at 15ip, 0.06% at 7½ ips

Signal-to-Noise Ratio:56db (SLH tape), 53dB (standard tape)

Sound quality rating:7 / 10

Long-term reliability rating: 8/ 10

Weight: 58 lbs (26.4 Kg)

Additional Details


At around $US 1595, the TC-788-4 Quadradial was one of the most expensive tape decks Sony ever produced. It offered two speeds – 15 and 7½ , three heads, 10½ ” reel capacity, four- track four-channel recording and playback operation and an AC servo controlled capstan drive motor which provided constant speed regardless of voltage and load changes.
A closed loop dual capstan tape drive system assured positive tape to head contact and helped to isolated external vibration. Logic controlled function buttons gave feather touch direct transport switching from any mode to another mode without having to stop the tape first.
A synchro track facility allow ed synchronized recording of new tracks with previously recorded tracks and there was provisions for timer controlled recording or playback. Separate tape equalization and bias selector switches were provided to optimize the characteristics of any tape and a PAN POT facility enabled back to front channel mixing, especially useful for multi mic stereo recordings.

Additional Info

Price when new (in the USA) $1595
Track system
4 track 4 channel stereo recording and playback, 4 track 2 channel stereo, 4 track mono
Three; erase, record and playback
AC servo-controlled capstan motor, two 8 pole induction reel motors
Maximum reel size
10½ ”
Tape speeds
15 & 7½ ips
Frequency response (3dB)
15 ips: 30Hz – 22kHz (standard tape); 30Hz – 28 kHz (SLH tape)
7½ ips: 30Hz – 17kHz (standard tape); 30Hz – 23 kHz (SLH tape)
Wow & flutter
0.04% at 15ip, 0.06% at 7½ ips
Signal to noise ratio
56db (SLH tape), 53dB (standard tape)
Rewind speed
150 sec with 2,400ft tape
Harmonic distortion
Bias frequency
4 each 0.06 V at 100 kohms (line), -72 dB (lo-Z microphone)
4 each 0.775 V at 10 kohms (max p/b level), 8 ohm headphones
22 x 17½ x 8¾ ” (559 x 444.5 x 222 mm)
58 lbs (26.4 Kg)


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