Technics SU-7600

Commentary

Stereo pre-main amplifier with fully discrete power amplifier.

The power amplifier is a discrete type using low-noise and low-noise transistors.
The OCL circuit consists of an all-stage direct-coupled differential-amplified complete complimentary service OCL circuit. An emitter-follower is inserted at the latter stage of the differential amplification to improve matching with the latter stage and to reduce distortion at the time of small signals.

A specially selected IC is used for the equalizer circuit to achieve low noise and high stability.
The circuit configuration is 3-stage direct connection system.

The tone control method has succeeded in reducing frequency fluctuations and increasing the range of tonal changes.

The electric field capacitor in the power supply circuit has a high withstand voltage of 40 v and a large capacity of 10,000 μ F.

The Master-Level control uses a 41-point step type for precise fine adjustment.

It is equipped with double protection circuit of relay and fuse, and it prevents transistor and speaker from being damaged in the case of emergency.
The relay circuit also has a time constant to prevent shock sound when the power is turned on.

Two tape decks can be connected, and dubbing from 1 to 2 is possible by operating the knob.

Two speakers can be connected.

It is equipped with a loudness switch which is effective for low volume and a high filter which removes high-sound noise such as scratch noise.

There was a wood case sold separately.

Model Rating

Type	Stereo pre-main amplifier
Power Amplifier Unit
Effective output (both channels)	1kHz: 55W + 55W (4 Ω) 43W + 43W (8 Ω) 20 Hz to 20 kHz : 50W + 50W (4 Ω) 41W + 41W (8 Ω)
Total harmonic distortion factor	0.2%
Output bandwidth (both ch8 Ω)	5 Hz to 65 kHz, -3dB
Residual noise	0.6mV
Damping factor	40 (8 Ω)
Applicable load	Main or Remote : 4 Ω ~ 16 Ω Main + Remote : 8 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono : 2mV/47k Ω Tuner, AUX : 150mV/47k Ω
Phono Maximum Input (1 kHz, RMS)	120mV
Signal-to-noise ratio (IHF-A)	Phono:72dB Tuner, AUX : 92 dB
Frequency characteristic	Phono : RIAA standard curve ± 0.5 dB AUX : 7 Hz ~ 75 kHz + 0 -3dB
Tape Monitor 1, 2	Playback : 150mV/47k Ω Rec Out:150mV
Tone control	Bass : 50 Hz ± 13 dB Treble : 20 kHz ± 13 dB
Loudness	100Hz+8dB
High filter	7 kHz, -6dB/oct.
<General>
Semiconductor used	IC : 2 Transistor : 23 Diode : 9 pcs
Pwer	100 VAC, 50/60Hz
Power consumption	100W
External dimensions	Width 410x Height 140x Depth 332 mm
Weight	7.5kg
Sold Separately	Wood Case SH-770 (¥ 3,000)