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Sony TC-750 Series
Professional Quality Three-Head,
Three-Motor Tape Decks
With 10-1/2” Reel Capacity

Shown (L to R): TC-756-2 (typical), TC-758 and TC-788-4
The Age of Specialization is here, represented in the SONY line by five outstanding tape decks. Stereo models TC-755, TC-756, TC-756-2, TC-758 and their four-channel cousin, TC-788-4.
Nearly identical in appearance, each one has a subtle point of difference that suits it to a slightly specialized function.
The stereo half-track TC-756-2 boasts 10-1/2-Inch Reel Capacity and tape speeds of 15 and 7-1/2 ips: typical professional capabilities in a deck for the serious amateur. The TC-756 is its quarter-track twin.
The TC-755 also provides 10-1/2-Inch Reel Capacity, but with tape speeds of 7-1/2 and 3-3/4 ips. It's a combination designed to furnish lengthy operating time at tape speeds fast enough to assure exceptional sound quality. The TC-758 adds Auto Reverse Record and Playback to the TC-755’s transport for a total of just over 6 hours uninterrupted playback using a 3600’ tape.
Like the two 756 models, the TC-788-4 also offers 10-1/2-Inch Reel Capacity and tape speeds of 15 and 7-1/2 ips but in a quarter-track Quad format. Syncho-Trak and Pan-Pots make it a deck well suited for any pro or home studio.
Among the most important features are Ferrite and Ferrite Heads (stereo models only). They last up to 200 times longer than standard magnetic heads, delivering better tape-to-head contact. Results: Wider frequency response and lower noise and distortion. There's Symphase Recording (stereo models only)that allows you to record 4-channel sound from an SQ* or FM matrix source. Play back through four speakers and an amplifier equipped with a 4-channel decoder for the ambience of a live performance with no phase differences between channels.
And with Closed-Loop Dual Capstan Tape Drive, you're assured of maximum tape tension and tape-to-head contact. Wow and flutter, skewing and modulation distortion are significantly reduced for decidedly professional-sounding results.
The Logic Controlled Tape Transport Functions minimize mechanism wear and the possibility of mechanism and tape damage. They let you activate the Feather-Touch Control Buttons in any sequence, with no danger of spilling or breaking tape.
You're assured of predictable performance by a Servocontrol Motor that maintains accurate tape speed despite fluctuations in line voltage or current.
The many high-performance features are supplemented by Tape/Source Monitoring, letting you check the quality of your recordings as you make them.
SONY's exclusive Automatic Total Mechanism Shut-Off returns all functions to the stop position at end-of-tape in any mode. You protect both tape and mechanism from unnecessary wear or damage, even when you leave the tape deck unattended.
Record Equalization and Bias Selector Switches let you get the best recording results from either standard or low noise/high output tape. And a Tape Path Adjuster assures smooth, even winding onto 10-1/2-inch reels.
Many, many more features contribute to longer, better, more trouble-free operation on these remarkable machines. Electrical Speed Change. Automatic Tape Lifters. Built-In Mic/Line Mixing.
The specifications are exciting. The flexibility, almost limitless. The prices, surprisingly accessible. SONY TC-750 series. The "pro" decks you can afford.
*- TM CBS labs.
Spotting Differences: Each machine has a lower head cover that identifies which model it is. Other ways to differentiate these models include:
TC-788-4 – The most obvious and easiest to spot due to the quad amplifier section. Also, the upper head cover has the quadradial logo instead of “F&F” logo and the case is wider allowing for vertical trim pieces between the case and front panel. The case is also fitted with larger, more stable feet. Lower head cover marked TC-788-4.
TC-758 – This machine is probably the second easiest to spot from a distance. The middle control panel has 5 feather-touch buttons instead of the usual 4, as well as an additional switch for auto-reverse mode at the extreme left side (see photo above), making it unique to this model. The lower (amp) panel also has a direction indicator just below the Timer Lock (next to upper left corner of Left VU meter) and is screenprinted “Bi-Directional Recording” just above the VU meters. Lower head cover marked TC-758 with white “Auto Reverse” logo below.
TC-756-2 – The 755/756 machines are more identical with only very minor spotting differences. The TC-756-2’s lower head cover is marked TC-756-2 with a red “2 Track” logo incorporated beneath.
TC-756 - The TC-756’s lower head cover is marked TC-756 with no other logo.
TC-755 - The TC-755’s lower head cover is marked TC-755 with no other logo. The only other difference is the middle control panel is screenprinted 7-1/2 and 3-3/4 ips instead of the usual 15 and 7-1/2 ips making it unique to this model (panels on the 756 / 756-2 / 788-4 models are identical).
Other minor differences include upper head cover screws (horizontal on 755 / 756 / 756-2; vertical arrangement on 758 / 788-4) and tension arm nuts (slotted on 755 / 756 / 756-2; pin holes on 758 / 788-4)
OTHER FEATURES INCLUDE:
· Pause Control with Lock
· Microphone Attenuator (common activation on stereo models, individual for each channel on TC-788-4)
· Mechanical Memory Capability with Timer
· FET Amplifier
· Ultra High Frequency Bias
· Sound-On-Sound and Echo with optional MX-6S Mixer or SB-200 Adapter
· VU Meters connected with Playback Volume
· Built-In Reel Locks
· Record Interlock
· Non-Magnetizing Record Head
· Large Illuminated Calibrated VU Meters
· Stereo Headphone Jack
· 4-Digit Tape Counter
· Retractomatic Pinch Roller
· No Pressure Pads
· Vertical/Horizontal Operation
· Walnut Base
· Microphone and Auxiliary Inputs
SUPPLIED ACCESSORIES
· RK-74 Patch Cords X 2 (X 4, TC-788-4)
· RAD-10 NAB Reel Hub Adapters X 2
· Empty 10-1/2 -Inch Plastic Reel
· Head Cleaning Ribbon
· Sensing Foil (TC-758 only)
RECOMMENDED ACCESSORIES
· ECM-280 Cardioid Condenser Microphone
· ECM-33P Cardioid Condenser Microphone
· ECM-54P Cardioid Condenser Microphone
· ECM-64P Omni-Directional High SPL Microphone
· ECM-65P Uni-Directional High SPL Microphone
· AC-148 48 Volt Phantom Power Supply
· SB-200 Sound-On-Sound and Echo Adapter
· NR-335 Dual-Process Dolby** Noise Reduction Adapter
· MX-510Active Five-Channel Stereo/Monaural Mixer
· MX-14 Active Six-Channel Stereo/Monaural Mixer
· MX-16 Active Eight-Channel In/Four-Channel Out Professional Mixer Console
· MX-20 Active Eight-Channel In/Four-Channel Out Professional Mixer Console (w/ EQ, Pan-pots, XLR)
· DR-7A Low Impedance Stereo Headphones
· DP-20 Molded Plastic Dust Cover (except TC-788-4)
· SB-300 Tape Recorder Selector
**- TM Dolby Labs, Inc.
SPECIFICATIONS
Power Requirements:
All except TC-755: 120 Volts AC, 110 Watts, 60 HzTC-755: 120 Volts AC, 100 Watts, 60 Hz
Tape Speed:
TC-756-2, TC-756, TC-788-4: 15,7-1/2 ips.TC-755, TC-758: 7-1/2,3-3/4 ips.
Reel Size: 10-1/2” Maximum Diameter
Recording System:
TC-756-2: Half-Track StereoTC-755, TC-756, TC-758: Quarter-Track StereoTC-788-4: Quarter-Track Quad
Rewind and Fast-Forward Time: 150 sec. /2400 ft.
Frequency Response:
TC-788-4:
Standard Tape:
30 Hz to 22 kHz -± 3 dB @ 15 ips.
30 Hz to 1 kHz -± 3 dB @ 7-1/2 ips.SLH-180 Tape:
30 Hz to 35 kHz -± 3 dB @ 15 ips.
30 Hz to 23 kHz -± 3 dB @ 7-1/2 ips.

TC-756-2, TC-756:
Standard Tape:
20 Hz to 25 kHz @ 7-1/2 ips. 20 Hz to 15 kHz -± 3 dB @ 7-1/2 ips.SLH-180 Tape:
20 Hz to 35 kHz @ 15 ips. 25 Hz to 45 kHz -± 3 dB @ 15 ips.
20 Hz to 30 kHz @ 7-1/2 ips. 30 Hz to 25 kHz -± 3 dB @ 7-1/2 ips.

TC-755, TC-758:
Standard Tape:
20 Hz to 25 kHz @ 7-1/2 ips. 30 Hz to 20 kHz ± 3 dB @ 7-1/2 ips.
20 Hz to 17 kHz @ 3-3/4 ips.
SLH-180 Tape:
25 Hz to 30.kHz ± 3 dB @ 7-1/2 ips.
20 Hz to 20 kHz @ 3-3/4 ips.


Signal-to-Noise Ratio:
TC-756-2: Standard Tape: 56 dB, SLH-180 Tape: 59 dB***All ¼-Track models: Standard Tape: 53 dB, SLH-180 Tape: 56 dB
Wow and Flutter: RMS (NAB Weighted)
TC-788-4 TC-756-2, TC-756: TC-755, TC-758:
0.04% @ 15 ips. 0.03% @ 15 ips. 0.05% @ 7-1/2 ips.
0.06% @ 7-1/2 ips. 0.06% @ 7-1/2 ips. 0.08% @ 3-3/4 ips.
Inputs:
Line In: 2 (one for each channel / 4 for TC-788-4)
Plug Type: Phono
Impedance: 100k Ohms
Input Sensitivity: 0.06 V.
Microphones: 2 (one for each channel / 4 for TC-788-4)
Plug Type: Phone
Impedance: Low
Input Sensitivity: -72 dB
Bias Frequency: 160 kHz
Type of Level Indication: Two VU Meters Calibrated to NAB Standards
Outputs:
Line Out: 2 (one for each channel / 4 for TC-788-4)
Plug Type: Phono
Impedance: > 10k Ohms
Output Level: 0.775 V. (@ 0 VU) PB Vol. Max.
0.435 V. (@ 0 VU) PB Vol. Center Detent Position
100k Ohms Load
Stereo Headphone Jack: 1 (2 for TC-788-4, 1 Switchable Front/Rear/Front+Rear)
Plug Type: Binaural Phone Jack
Impedance: 8 Ohms
Head Configuration:
TC-788-4:
1 Quarter-Track Four Channel Inline Erase1 Quarter-Track Four Channel Inline Record1 Quarter-Track Four Channel Inline Playback
TC-756-2:
1 Half-Track Erase1 Half-Track Record1 Half-Track Playback
TC-756, TC-755:
1 Quarter-Track Erase1 Quarter-Track Record1 Quarter-Track Playback
TC-758 (six head function):
2 Quarter-Track Erase (fixed)1 Quarter-Track Record/1 Quarter-Track Playback (roto-bilateral design)
Type of Motor:
AC Servo Motor for Capstan x 1
Induction Motors for Reel Drive x 2
Dimensions: 17-1/8”W x 17-3/4” H x 8-3/4” D (stereo models)
17-3/8”W x 22” H x 8-3/4” D (TC-788-4)
Unit Weight:
TC-755: 50 lbs., 11 ozs.TC-756-2, TC-756: 52 lbs., 14 ozs.TC-758: 53 lbs., 10 ozs.TC-788-4: 58 lbs., 7 ozs.
***- This specification is also given in the Sony Sales Brochure for the TC-756, but since S/N is usually dependent on track width we suspect all ¼ track machines are the same. Service Manual specs confirm this.
Photo and data direct from Sony(Superscope) brochures. Thanks to A. W. Covert, Battle Creek, MI for this page.