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I repair vintage audio. HK 330B for sale - $375 (Wautoma)
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This unit needed work done to get the tuning meter working correctly. Found a faulty diode. Also replaced 27 small signal transistors that are known to go bad.
All controls have been cleaned with proper fluids. Predriver/driver adjustments have been set to service manual specifications.
I also refoam speaker surrounds. Contact me to see if I can help with your '70's era electronics. I am a trained electronics technician. This is my hobby so I don't ask for a lot, I don't do this for the money. I like doing this and it keeps me busy.
I don't work on tube units, turntables, CD players or tape decks. I stopped doing restorations/rebuilding gear because it's too time consuming and isn't a challenge.