Audio Database


Technics SU-3500
86,800 yen(around the 1975 time)

The Integrated Amplifier which improved the stability of the circuitry by the constant-voltage regulated power supply of ±40V.

The equalizer circuitry serves as three-step hardwired-connection circuitry of the differential-amplification 2 power-source scheme with a pure complimentary SEPP output stage.
Moreover, an input impedance can be switched in three steps of 25kohms/50kohm/100kohm.

The main-amplifier part consists of pure complimentary whole page hardwired-connection differential-amplification OCL circuitries, and also low-voltage-izes a power source, is using two children of 10,000-micro F electrolytic capacitors for an output stage, and is pursuing a low distortion and quantity stability.

NF type is adopted as a tone control circuit. Moreover, the tone-defeat switchpoint which returns a property in an instant is carried.

The preset type volume which can be used also as an audio muting is adopted.

Two tape decks are connectable.

Two Phono terminations are carried.


Rating of a mode
Form Stereo Integrated Amplifier
Circuit system Perfect complimentary whole page hardwired-connection differential-amplification OCL circuitry
Music power 190W (4ohms)
125W (8ohms)
Effective output
(1kHz, both channel drive)
55W+55W (4ohms)
43W+43W (8ohms)
Output bandwidth (8ohms) 5Hz - -70kHz three dB
THD 0.08%
SN ratio Phono:70dB
Dumping factor 100 (8ohms)
Phono maximum permissible input 510mV(1kHz)
Tone control Bass: ±12dB (50Hz)
Treble: ±12dB (20kHz)
A low filter 30Hz-12dB / oct
A high filter 8kHz-12dB / oct
Power source AC100V, 50Hz/60Hz
Power consumption 110W
Dimensions Width 410x height 140x depth of 340mm
Weight 10.2kg