Herbert Power loss

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Hi everybody,

As told in the subject my Herbert suffers of power loss on every channels.
It works well till it gets really warm, after about 5-10 min playing.
And then it goes up and down.

First I thought the power tubes were on the edge so I changed all six this morning (Groove tube EL34R) and adjusted Bias to 65mA as told.

Can the problem come from the preamp tubes? I never changed 'em..
Or could it be something else?

Thanks for answers.
 
You could always try a good preamp tube in place of each of your old preamp tubes and see if anythings changes. You can always change them all just like you did with the power amp tubes. However, if you want to find the weak link all you need is get one good preamp tube and go test one preamp tube at time. Hope this helps.
 
Hi,

Peter I still got the problem, and I'm getting tired playing on a 5150 :) it's nice but not in the same league.

I opened the beast and saw a couple of welding issues on 69 and 70 caps, can this cause this issue?

Thanks for all
 

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