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TC 50 Combo Noise

Posted: Fri Feb 01, 2019 7:17 pm
by cuuhl
Hey all, I’m hoping somebody has a similar experience with this so I don’t have to completely disassemble my TC 50 combo amp… The amp makes a noise like tube rattle when I’m playing lower octave notes. It’s a relatively loud noise as I’m playing at about 90 dB and can hear it. At first I thought it was coming through the speaker, but Its not. I removed each pre-amp tube cover one at a time and it did not make a difference. It seems like it’s coming from within the chassis. Does anybody have any idea what might be making this noise and/or suggestions for a fix? Thanks!

Re: TC 50 Combo Noise

Posted: Fri Feb 22, 2019 12:23 pm
by ggmalcolm
I also had one that made rattling noises, and I tracked it down to being the speaker causing it.
My test method was to capo a low offending note, striking it and while letting it ring out press firmly on the back of the speaker in towards the cabinet.

Re: TC 50 Combo Noise

Posted: Fri Feb 22, 2019 12:48 pm
by Authorized Boogie
cuuhl wrote:
Fri Feb 01, 2019 7:17 pm
Hey all, I’m hoping somebody has a similar experience with this so I don’t have to completely disassemble my TC 50 combo amp… The amp makes a noise like tube rattle when I’m playing lower octave notes. It’s a relatively loud noise as I’m playing at about 90 dB and can hear it. At first I thought it was coming through the speaker, but Its not. I removed each pre-amp tube cover one at a time and it did not make a difference. It seems like it’s coming from within the chassis. Does anybody have any idea what might be making this noise and/or suggestions for a fix? Thanks!
Sounds like it could be a power tube rattling. While you play, have someone hold each power tube one at a time with a towel (as the tubes will be hot) and see if it stops when a particular tube is held. Not uncommon in a combo amp.

Re: TC 50 Combo Noise

Posted: Fri Feb 22, 2019 1:08 pm
by cuuhl
I hadn’t thought about the power tubes. I’ll give it a whirl. Thanks!