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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 11 Jul 2020, 11:50

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PostPosted: 28 Mar 2020, 09:22 

Joined: 29 Feb 2020, 12:32
Posts: 1
Hi All,
Apologies if this post isn’t in the correct place.
I’ve got a faulty Audiolab 8000P. It operates correctly for about five minutes and the the out protection relays drop out. I’ve replaced one as the contacts were burned away and also a 22R 2W resistor the had obvious signs of too much heat.
My question is, fault finding for five minutes at a time is obviously less than perfect and I don’t want to risk causing even more damage and was wondering about investing in an variac to use at a reduced voltage while I do the fault finding. My problem with variac or auto transformers is safety. So with that in mind would it be a good alternative to use a normal isolating transformer with a secondary of around 40v? I’ve already got a 24v one but I wondering if that won’t be enough for the circuitry to do its thing sufficiently.
I have some experience in fault finding but this is the toughest job yet. I’ve got access to DMM, digital ‘scope and s signal generator.

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