Mod 50 ringing sound

[abrackas]

Hello all,

I turned on my Mod 50 today for practice and noticed there is a ringing sound in the background regardless of channel. It is the most prevalent when the guitar's volume pot is all the way up vs turned down a little. I am thinking it might be the power tubes as that's the only thing I can think of. It has worked flawlessly so far including last night. Input or thoughts?

Thanks

 

[bj4rd]

microphonic preamp tube maybe? there should be 2 or 3 preamp tubes that are shared by all modules and maybe it is one of those. maybe try swapping in a good preamp tube in the different spots?

 

[viking22]

Hello all,

I turned on my Mod 50 today for practice and noticed there is a ringing sound in the background regardless of channel. It is the most prevalent when the guitar's volume pot is all the way up vs turned down a little. I am thinking it might be the power tubes as that's the only thing I can think of. It has worked flawlessly so far including last night. Input or thoughts?

Thanks

I agree 100% with you !It sounds like a Power Tube problem.