output issue with the triaxis

[masque]

hey guys......just noticed a problem with my triaixis.....i was jamming and something didnt sound quite right and i checked and i have virtually no volume at all coming out of output A of the triaxis but output B is big and thick as usual.

to ensure that my 20/20 power amp was not the problem i reversed the wiring and the left side of the power amp was fine so it's not that.

i have also tried different cables but nothing seems to work.

this seems like a weird problem to me....could it be tube related? if anyone knows why i could have virtually no signal coming out of output A and normal full signal out of output B I sure would appreciate the help.

 

[ando]

Most likely the output pot on the front panel. They get old and wear out. The A chanbel has usually been used a lot more than the B channel. It's not a big fix if that's it. Try running from your FX sends directly to your amp.

 

[masque]

the fx send is fine but the "A" output for both the normal and recording output is nearly incapable of producing any sound.

 

[elvis]

The output pot will affect the main out but not the rec out. I'll bet half of V5 went bad.

 

[masque]

The output pot will affect the main out but not the rec out. I'll bet half of V5 went bad.

BAM.....you are correct! I would not have believed it but just for the heck of it i thought i would change out the tubes prior to running it to the repair shop and when i did everything was fine! i didnt realize that half a tube could go bad...but now i know :wink:

 

[elvis]

Happy it works!

I'd guess it's more likely for half a tube to go bad than the whole thing, BUT usually the gain stages are in series, so you can't tell it's just half when a tube goes bad.