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Pioneer SA-3000

Stereo Integrated Amplifier (1979-81)

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Pioneer SA-3000


Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.02%

Damping factor: 30

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 86dB (MM), 100dB (line)

Output: 150mV (line)

Semiconductors: 30 x transistors, 22 x diodes

Dimensions: 380 x 83 x 295mm

Weight: 7.6kg


schematic   English - mopargoob

instruction/owners manual   English - duffalora

KU schematic   English - shortcircuit43

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Hi-Fi Stereo

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bias (idle current) adjust

An amplifier that sounds great, but due to age, I think I should return it to the original parameters. Does anyone know exactly how to adjust the idle current (bias)? What are the pins which should be measured and what is the exact value of the current?
I ask these things because I can not find the service manual.
Thanks in advance to anyone who will help me.

re: bias (idle current) adjust

I'm not so sure, but see on schematic you have a trim pot for "Idle Adjust".
On the base of Q15 (resp. base Q16in other chanell). You must measure Voltage (0.6V by schematic) in emmiters on power transistors Q1,2,3,4.
Hope to be symmetrical on otput (no DC voltage on output)

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