Sansui 8080DB DC Offset and Bias Adjustment @davismv
Sansui 8080DB DC Offset and Bias Adjustment  @davismv
Uploaded March 2024 | Updated September 2026, 2 weeks ago
Adjusted the bias and DC offset for my Sansui 8080DB. Picked this up from a guy in Aurora, IL maybe 2 years ago. I’ve never opened it until tonight.

Power supply and internals are very clean with no heat evidence. And while this is a Dolby unit, I don’t touch the controls and it has the preferred black ribbon cable if I/someone needs to get in there in the future. And the Dolby board looks good at this point visually.

All original bulbs, low hours, I wasn’t sure what to expect from adjusting the DC and bias. Sure enough they were all off and it’s back to spec as of now.

Performed a good clean out for some general dust, including the bottom panel when removed, which you can tell if it’s never been opened. Also gave it the Deoxit treatment and such.

This is a close tie in comparison of sound quality to my Sansui G-9000.

Here’s a video of tonight adjustments and performance.
Sansui 8080DB DC Offset and Bias AdjustmentCarver M-1.0t Amplifier Biasing.  200WPC, 1986.Optimus STAV-3400 105 WPC from 1993 (Pioneer VSX-D702S)Sansui 7900Z Re-Biasing, 100WPC, 1980Akai AA-R32 45WPC Receiver from the 1980’s - an ADHD Dream!Sony BetaCam SP Playback Deck PVW-2650Sony ps-77 BSR Automatic Changer Turntable from ~1973Sansui G-9000 160WPC Monster from 1978Sony TC-580 Refurbishment for CustomerRenewed Pioneer RT-707 - Replaced all 10 2SC1344 transistors!!Technics SA-550 and SA-850 Amp BiasingPioneer QX-8000A Quad 22WPCx4 WOW!
Mark Davis |

Sansui 8080DB DC Offset and Bias Adjustment

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