Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Parasound HCA-800 II - How to Bias?
Parasound HCA-800 II - How to Bias?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 27th October 2012, 02:22 PM   #1
Vercus is offline Vercus  United States
diyAudio Member
Join Date: Apr 2009
Question Parasound HCA-800 II - How to Bias?

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.

  Reply With Quote
Old 28th October 2012, 07:51 PM   #2
amptech is offline amptech  Scotland
diyAudio Member
Join Date: Jan 2009
Location: Glasgow
Send a message via MSN to amptech
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.
  Reply With Quote


Parasound HCA-800 II - How to Bias?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Parasound HCA-800-II schematic anyone? taj Solid State 3 9th March 2012 03:51 PM
Parasound HCA-3500 Bias issue thejck Solid State 15 1st March 2012 03:59 AM
Parasound HCA-2200 II Fuses movinginstereo Solid State 0 3rd December 2009 03:31 AM
Parasound HCA-2200 II repair question cocolino Solid State 10 6th September 2008 07:45 AM
Need Schematic for Parasound HCA 2200 II mjctech Solid State 2 15th September 2005 04:25 PM

New To Site? Need Help?

All times are GMT. The time now is 06:34 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio