Parasound HCA-800 II - How to Bias? - diyAudio
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Old 27th October 2012, 02:22 PM   #1
Vercus is offline Vercus  United States
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Question Parasound HCA-800 II - How to Bias?

Hello,
I have two of these amps. One is running fine, but the other runs very cool and has very little power. I was told to check the bias. I have adjusted the bias on other solid state amps, and can do it on this one, if someone can tell me where to measure, and what to adjust.

I'm assuming I adjust the TVR8 pot on each channel, but where do I measure the bias at, and what is the expected voltage?

Any help you guys could provide would be greatly appreciated.

Thanks!
Jon
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Old 28th October 2012, 07:51 PM   #2
amptech is offline amptech  Scotland
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Baising the output stage is done via placing your meter leads across one of the emitter resisters, and the other lead on the output path ..say the .22 or .47 ohms and adjusting the bias trim pot.. Or place your test leads across both emitter resistors that way your reading the mv volts and adjust trim pot..

Check your working amp bais voltage across so you can get an idear or the mv voltages..this could be say 20mv or more.
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