Pioneer SA-8100 Stereo Amplifier

Pioneer SA-8100 Stereo Amplifier.

Fully restored in November 2025. We use ONLY hiqh quality audio grade parts, ordered at Mouser/DigiKey. No corner cutting to save a few bucks.

What was done:

Both filter capacitors have been replaced/upgraded (10000uf -> 15000uf) with the same diameter to keep the original design.

Power output transistors were replaced with matched together for hFE (DC gain) Onsemi MJ21195G/MJ21196G

ALL electrolytic capacitors have been replaced with audio grade Nichicon UPW, UKL, WIMA and Kemet film caps (<= 4.7uf)

All tired resistors and diodes have been replaced with Onsemi, Fairchild.

Many noisy and tired transistors were replaced.

Bias and DC Offset adjusted to specs.

The final output power test after restoration brought us the following measurements (see the last photo): output: Channel 1: 43.9 W RMS Channel 2: 46.5 W RMS into 8 ohm. Factory’s specs are 40 W/channel.

Exterior conditions:

Faceplate. Very good condition.
Wood. Very good. Reconditioned with a walnut finish.

Every restored unit has a full burning day at medium volume.

Will be double boxed for shipment.

Local pickup is welcome.

All removed parts are not included; the photo is provided for information only.