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Originally posted by bakerlite
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Glad the root cause of the problem has been identified.
Tom
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It is feasible to take off the end bells and look for the problem. However, since you recently procured this transformer I think it would be best to ask for a warranty replacement.
Glad the root cause of the problem has been identified.
Tom -
wait, wasnt the original PT "melted" ?
so....the new PT is the problem?
doesnt that sound a little strange?Comment
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Yes, especially with bias winding short to lamination (ground), he wouldn't be able to set bias current at allOriginally posted by anthillrich View PostComment
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Well, it depends.
If the hot end were shorted to ground, yes, it would be impossible to set bias.
If the short lies close to the other end, no big problem.
I wind my own transformers and one potential problem I must be aware of is that the last couple laminations, which fit very tightly, may if skewed even a little cut through the bobbin and touch or scratch insulation and even cut some wires.
EDIT: what's important here is that there should be *no* continuity at all from any winding to the transformer core.
NONE.
Obviously, measured with the trafo floating.Juan Manuel FaheyComment
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Thank you folks for taking your time to help me out!
So an update of sorts.
The amp (with its new main board - new PT and new Tubes) Sounds fantastic, really really good, and what small hum was there before is gone -
I still 'feel' that the transformer gets too hot for my liking compared to any amp I have ever used.
voltages check out good, as I said there is no hum and she sounds very very good,
But I just don't know would I trust it to last with the transformer getting that hot. - its not red hot like you wouldn't burn your hand of it but its very very warm! doesn't seem quite as hot as before but to be honest i cant see the wood for the trees at this stage.
Taking it from the beginning like a new amp with a new problem where would you be looking if a PT ran hot?Comment
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Thank you folks for taking your time to help me out!
So an update of sorts.
The amp (with its new main board - new PT and new Tubes) Sounds fantastic, really really good, and what small hum was there before is gone -
I still 'feel' that the transformer gets too hot for my liking compared to any amp I have ever used.
voltages check out good, as I said there is no hum and she sounds very very good,
But I just don't know would I trust it to last with the transformer getting that hot. - its not red hot like you wouldn't burn your hand of it but its very very warm! doesn't seem quite as hot as before but to be honest i cant see the wood for the trees at this stage.
Taking it from the beginning like a new amp with a new problem where would you be looking if a PT ran hot?Comment
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well it seems you were right to be suspect at the end there-
PT mounting bolts are getting very hot still.
i've checked the iec board it seems ok - its relatively simple pcb.
maybe something i've missed on tComment
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