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In Reply to: RE: R&R tubes in Transcendent T8-LN posted by LtMandella on December 04, 2019 at 06:40:34
All fixed! Amp sounds great again.
I replaced the anode caps with ceramic versions.
Replaced 8 EL-509 power tubes with tubes from my "NOS" cache.
Then I decided to take a look on the component side of the board and found 4 leaky 1 mfd 630v caps, so replaced those.
After all above replacements, still not much improvement. Sound was thin and distorted in the lower frequencies.
As a last resort, I decided to check the fuses. The T8-LN has a 1.5 amp fuse for each channel, and a 6 amp power fuse.
Since I always had sound from both channels I never thought to check for an open fuse.
But one of the channel fuses was open. After replacing that fuse, all is good!
There must be something wrong with me for not having something wrong.
Follow Ups:
because you DID have something wrong.
Any idea why a blown fuse didn't cause profound problems, apparently since you only found it by checking fuses?
also it might be worth noting: visually there was little indication the fuse was blown - it is one of 3 for the amp. No glass discoloration or burn mark. But continuity test showed it was open.
There must be something wrong with me for not having something wrong.
Well kind of depends on your definition of "profound".
There was basically no bass, and even the mids were distorted.
I don't understand electronic theory well enough to know the function of the circuit that was fused. I would have expected one channel to be completely dead.
But it was not.
The amp is a factory built T8-LN from Transcendent Sound. I have the schematic...
There must be something wrong with me for not having something wrong.
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