The Amp Garage

Just thinking out loud.... When you jumped from the first triode to the output did you disconnect the tone stack or just turn volume down and jumper around it? Did you disconnect the coupling cap from the grid of the 6v6? On the Vibro Champ I mentioned in your other thread I ended up using a "listen...

Cool stuff! Thanks for sharing!

I just finished working on a Vibro Champ that had a weird fuzz on the decay of notes. It happened at any volume - not just cranked. Turned out to be the volume pot.

Good Luck!

Thanks for all the replies! I've gone ahead and ordered 600v caps from Just Radios.

martin manning wrote: ↑Sun Mar 10, 2019 10:50 pm Can you get some measurements of the PT input and output voltages?

Primary - 121vac
Secondary - 380-0-380
Bias - 55vac
Filaments - 6.87vac

didit wrote: ↑Mon Mar 11, 2019 12:03 am Hello -

Just Radios stock axial caps up to 600V .. https://www.justradios.com/axialelectrolytics.html.

Best .. Ian

Thanks for the reminder!! I always forget about Just Radios but have used them several times for hard to find caps.

Came without a power cord so gotta wire one up first. Will do that later this evening.

I've got a 6G6A Bassman that needs filter caps. Stock caps were all 20u/525V . Schematic shows 470vdc at the first cap. I'm guessing I might likely see higher than that with modern mains voltage. I have F&T 22u/500v caps on hand but I'm concerned that may be cutting it close. I can use a pair of 47u...

Sounds awesome.

The owner has played it for a bit as it is now and digs it. Will likely leave it as is but will let him know and see if he's interested in the changes.

Thanks for the input!

I have what appears to be an AA165 that someone attempted to convert to an AA864 on my bench. Most values had been changed to AA864 including the removal of the 8uf filter cap for the input stages. Had some hum issues that I was able to clean up by fixing grounds and and removing a half-assed DC hea...

Awesome!

Thanks!

I've been swamped with other work so I haven't had a chance to touch it since the last post. Hoping to get it back on the bench this weekend. Not much left to do - I'll update if I make any progress.

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