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Amplifier mains hum help
Amplifier mains hum help
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Old 7th December 2011, 05:17 AM   #11
killersoundz is offline killersoundz  United States
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Join Date: Dec 2011
Location: Canton, OH
Originally Posted by tauro0221 View Post
If you have a voltmeter read the rail voltage with the meter voltage selector in AC. The voltage should read close to zero. If it's read close to zero the power supply is OKAY.
Sorry, where do I take this reading at?
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Old 7th December 2011, 07:06 AM   #12
Enzo is offline Enzo  United States
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Join Date: Sep 2004
Location: Lansing, Michigan
With respect to chassis ground, there will be two main power rails in the power amp. The easy place to check that would be the center leg of the power ttransistors. The two on the left is one supply and the two on the right the other.

Also look at each power transistor, and see a litttle bit of metal exposed in the mounting tab area. That is electrically the same as the center leg. Just make sure your meter probe does not short that to something nearby in the process.
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Old 7th December 2011, 04:43 PM   #13
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
Originally Posted by killersoundz View Post
Do you mean the main input jack on the front panel of the amp or the input plug on the power amp board?
If there is more than one input plug, then try every option !!!!
regards Andrew T.
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Old 7th December 2011, 05:27 PM   #14
tauro0221 is offline tauro0221  United States
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Join Date: Nov 2008
Location: Victoria,TX

You can check the positive voltage at Q16 and the negative voltage at Q17.
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