TH-30 Volume spike

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bmerkett
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Joined: Fri Jun 28, 2019 11:49 pm

TH-30 Volume spike

Post by bmerkett » Sat Jun 29, 2019 12:16 am

I’m new to the board and have looked everywhere under the FAQ’s but don’t see my issue. Please help, if possible. I appreciate it.

I just bought a new TH-30, and a single PPC112 cab. When I turn up the clean side, the volume adjusts as expected from 1-2, then SPIKES into high output between 2-2.5. After 2.5, it returns to its expected level. This only happens on clean channel. When I looked at the tube schematics I assumed it was clean preamp tube on the front far right. I reset that tube and nothing changed, then I flipped switch using only half the 12ax7 tubes at the lower volume, same issue.

I really want to keep this amp, but it’s annoying. Anyone else have this problem.

Thank you!

Sootio
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Location: North Carolina, USA

Re: TH-30 Volume spike

Post by Sootio » Sat Jun 29, 2019 8:30 am

Could be the volume pot. Might need spraying out or replacing.

adkguy07
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Location: Upstate New York

Re: TH-30 Volume spike

Post by adkguy07 » Sat Jun 29, 2019 10:32 am

My option is the same as Sootio; check that volume pot. It might be dodgy and need replacing. A shot of contact cleaner might solve this, but if not, the whole pot should be replaced.


adkguy07

northernguitarguy
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Re: TH-30 Volume spike

Post by northernguitarguy » Sat Jun 29, 2019 10:50 am

Take it back. For what you paid for it, it should be performing flawlessly. If you do decide to try to clean the pot, be sure to use an electronic cleaner with a lubricant. Regular contact cleaner can damage a pot, I know from experience. FWIW, I have a can of Deoxit Faderlube that will last the rest of my life.

adkguy07
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Posts: 240
Joined: Tue Sep 27, 2016 3:46 pm
Location: Upstate New York

Re: TH-30 Volume spike

Post by adkguy07 » Sat Jun 29, 2019 10:57 am

Agree NGG! Deoxit is what I use. Some contact cleaners can cause a problem. The best alternative is to take the amp back......that pot should not be functioning as you describe it in you post.


adkguy07

northernguitarguy
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Location: Ontario, Canada

Re: TH-30 Volume spike

Post by northernguitarguy » Sat Jun 29, 2019 12:03 pm

Will add that amp should be returned without an attempt to clean the pot. Or let the vendor do it so any warranty violations are on them.

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