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Technics SU-8099

Stereo Integrated Amplifier (1979-80)

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Technics SU-8099


Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 1Hz to 200kHz

Total harmonic distortion: 0.005%

Damping factor: 100

Input sensitivity: 0.1mV (MC), 2.5mV (MM), 200mV (line)

Signal to noise ratio: 80dB (MC), 90dB (MM), 110dB (line)

Output: 200mV (line), 1V (Pre out)

Speaker load impedance: 8Ω to 16Ω

Dimensions: 450 x 420 x 142mm

Weight: 20kg

Year: 1979


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re: SU-8099

This model is an excellent ad dependable equipment.
Recently my SU 8099 don´t sound. No click in the initial power on but light normal (power on, operation, fl display)
I have this amplifier since 1979, new.
The connection and speakers are ok.
Fuses ok
No sound in earphone too.
The eight big metal transistors warm up normaly.
Inside everything appear normal.
Please help!.

re: SU-8099

i'm presently checking on the schematics to know where your problem start

let me introduce myself, i'm Raphaël troini, i'm 21 years old i finished my studies in electronic repair and conception. i'm familiare with technics and kenwood conception.

i'll reply when i'll found the issue

re: SU-8099

My SU8099 its come back.

Hello Raphaël , thank you very much for offering me help.

Providentially I already found the fault, as I describe below.

My knowledge of electronics are very basic but fortunately the manuals published on our website are excellent.

Thank you Raphaël again.


The main amplifier board was have capacitor defective (C625 33uf 16V). I change this capacitor and your “backup” (C623 33uf 16V). All capacitors in this board are ok, and no find the exactly replacement, thus no change preventive.

However the pre-amplifier was have several capacitor in bad condition, I change all then, except capacitors ok, to maintain original components.

I´m very happy, the sound its perfect.

Change in Pre-amplifier:
C101 6,3V 220uf
C102 6,3V 220uf
C103 6,3V 220uf
C104 6,3V 220uf
C111 16V 10uf
C112 16V 10uf
C119 16V 100uf
C120 16V 100uf
C207 16V 10uf
C208 16V 10uf
C219 6,3V 220uf
C220 6,3V 220uf

This website is not affiliated with or sponsored by Technics. To purchase SU-8099/SU-8099K spares or accessories, please contact the company via their website or visit an authorised retailer.