mojavepat
Joined: Mar 13, 2025
Posts: 1
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Posted on Mar 13 2025 07:00 PM
Greetings all! This is my first post..
I purchased one of these from Billy back @ 2013. Easily one of my all-time favorite pieces of gear. Unfortunately, it just decided to stop working.. At least the reverb side. It still powers up, and the tremolo works as it should. So I just popped it open, and noticed a resistor burnt out in there.. Big one right below the 6BM8 tube.. I can't tell what the value is. Anyone know or have a schematic? Or how to get in touch with Billy?
Thanks!
Pat

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edwardsand
Joined: Jun 29, 2018
Posts: 792
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Posted on Mar 14 2025 09:46 AM
Looks like a cathode resistor for the pentode section of the 6BM8. The resistor should probably be in the range of 470 to 1k Ohms and needs to be a high watt resistor maybe 2W at minimum, but 5W would be better.
I don't know if you can get the schematic, but you can find a discussion of 6BM8 based reverb here:
https://el34world.com/Forum/index.php?topic=30220.msg333094#msg333094
That's where I got the 470 Ohm value.
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