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Help ID Vox AC15C1 noise?

TimmyP

Member
Messages
2,488
Tube rattle. You should find that tapping on the amp causes the noise too. It could be a preamp or power tube IME. Gently flicking each with a fingernail will find it (careful, they are HOT).
 

servo

Member
Messages
7
Tube rattle. You should find that tapping on the amp causes the noise too. It could be a preamp or power tube IME. Gently flicking each with a fingernail will find it (careful, they are HOT).
Thanks TimmyP, now that I know what it is I can figure out how to fix it.

:aok
 

NortheastHick

Silver Supporting Member
Messages
6,723
Vox amps come with the absolute worst tubes ever. I don't even save them for backups, they go right in the trash. My advise; buy 2 el84's and 3 12ax7's and start pulling tubes.
 

WillLane

Member
Messages
2,184
I would change the stock tubes out. Keep them just in case for backups but I'd bet it would be time for you to get a 2nd set of new tubes before you'd have to use the stock tubes again. It could also just be the tube retainers rattling a little bit. Try some e-tape to keep them from vibrating.
 
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servo

Member
Messages
7
Thanks. I've got some JJs, Mullards, and Tung-sols in my Amazon wishlist. Just waiting for one to drop in price before I pull the trigger.
 

TimmyP

Member
Messages
2,488
Sometimes it's to reduce/prevent noise pickup, sometimes it reduces microphonics and/or instability (as with the Vietnamese Hand Wired AC15s we have - I added shields to V2 and maybe V3 - I forget - as they were a bit unstable when cranked).
 






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