Stiletto Ace, almost no output [RESOLVED!!!]

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primal

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A poster suggested I post this here as well.

Had this amp for a couple weeks. Been loving it.

Had it cranked today, sounded awesome. Shut down, no issues.

Fire it back up 20 minutes later and almost no volume at all. Can barely hear it.

I did a significant amount of troubleshooting already and here is what I have.

A little bit of sound (barely audible) with the effects loop in or out.

I took my Axe FX and ran it into the effects return and that seems to be fine. Sounds to me like the power section is fine.

I then went ahead and took a known good preamp tube and replaced each tube individually starting at V1.

No difference.

I then took 3 known goo preamp tubes and replaced v1-v3 then v3 - v5

Again no difference.

So at the moment I am at a loss.

I don't think it is a tube problem.

Any help would be greatly appreciated.

Thanks
 
Check the "good" tubes to make sure they are not Russian.
Stiletto no likey them in V3 and V4.
Search this forum for "cathode follower".
 
Yeah, have tried 3 different tubes in the V3 spot with the loop bypassed which takes V4 out of the circuit.

Nothing.

I would have thought atleast one of them would have gave me something intermittent if it were the cathode follower issue.

So frustrating.

Love this amp. Have to find out if it is out of warranty. I suspect it isn't.
 
So I took it to a tech and he said 2 of the 4 FET's in the amp had shorted.

Figures it must have been a bad batch. Replaced all 4 since the labor cost the same and the FET's were 1$ a piece.

Runs like a champ now.
 

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