Need help in trouble-shooting my AES Sixpacs amp - diyAudio
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Old 8th January 2007, 05:41 AM   #1
andy2 is offline andy2  United States
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Default Need help in trouble-shooting my AES Sixpacs amp

What happened was I tried to bias the amp, using a mini jack on the bac of the amp, but all of a sudden the bias was jumping all over the place. In a moment of panic, I pulled out the mini jack. At that moment, the tubes were flashing.

Now, the bias point won't go beyond 160ma. The optimal recommended value is 260ma. When I turn on the amp, there is no sound. I think 160ma is below the operating point of the tubes.

Does anyone have the schematic of the AES Sixpac amp?

Where should I begin looking at first.
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Old 12th January 2007, 05:10 AM   #2
andy2 is offline andy2  United States
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Old 12th January 2007, 10:52 AM   #3
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Have you checked the bias-pots....Sounds like they could be 'noisy' and during your adjustment have killed the O/P tubes....

As a start, check all supplies and fuses/fusables, then go on to the bias network, tubes etc..

Just a thought....
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