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Old March 11th, 2009, 03:15 AM   #1 (permalink)
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Eric Barbour 6bm8/ecl82 reverb driver

I'm looking for schematic examples of ECL type tubes used in a reverb driver circuit. I read that Barbour had a reverb mod were he replaced the 12at7 with a 6bm8 but can't find the schematic on the net.

So if anyone has any schematic examples of this application I would be most obliged.

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Old March 11th, 2009, 04:56 AM   #2 (permalink)
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I believe the real Barbour circuit is carefully guarded, but this seems to be the basis; it's from Svetlana and may have even been an early Barbour design, not sure:

http://www.tube-town.net/diy/sv-6bm8/sv6bm8_02.gif

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Old March 11th, 2009, 09:02 AM   #3 (permalink)
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Doesn't Victoria use a 6BM8 in one of their Gibson-derived amps? I dunno much about it, but I thought I'd throw that out there...

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Old March 11th, 2009, 10:30 AM   #4 (permalink)
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http://www.schematicheaven.com/barga...nder_t1rvt.pdf
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Old March 11th, 2009, 11:57 AM   #5 (permalink)
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Wow!

Thanks guys.

I was looking for the Guild Thunder Reverb schematic too!
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Old April 5th, 2009, 02:26 PM   #6 (permalink)
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pioneer sr-101

Hey, stumbled across this the other day, and thought I'd pass it along, seems like an interesting circuit to check out.

Sorry, no schematic as of yet...

http://www.audiokarma.org/forums/arc...p/t-56307.html

(2 12 ax7 and 2 ecl82/6bm8, and one 6x4, I believe.)

don't know if that is useful or not, but I thought I'd post it....

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Old November 28th, 2015, 09:26 AM   #7 (permalink)
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I'm currently building a lunchbox amp around a pair of 6BM8s -- push pull output and phase inverter in two bottles ...

Near as I can determine, the 6BM8 is pretty much a 5751 triode and an EL82 in a single envelope. Thinking ahead to my next project, I've been thinking about the 6BM8 for reverb drive (pentode) and recovery. I know EL84s have been used to drive the reverb transformer, but are a bit like driving thumbtacks with a sledge hammer. The power pentode side of the 6BM8 might be a bit less overkill. More importantly, it would allow me to implement a decent reverb with just one bottle. (Have used 12DW7s with the 12AU7 section as driver, and it worked okay, but not the kind of reverb I want if I'm going to bother doing it with tubes and springs.

On a different, but related topic, I've done a few builds using Merlin's bootstrapped cathodyne phase inverter, with pleasing results (that's what I'm using in my lunchbox amp). I'm wondering how it would work to use a 8BM8, with the power pentode implementing the phase splitter proper, with the triode driving it?

Both seem like scenarios where there might actually be a valid reason for doing it, rather than 'what if I try THIS goofy $h1t'

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Originally Posted by ThermionicScott View Post
Doesn't Victoria use a 6BM8 in one of their Gibson-derived amps? I dunno much about it, but I thought I'd throw that out there...

- Scott
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Old November 28th, 2015, 12:05 PM   #8 (permalink)
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Quote:
Originally Posted by sjhusting View Post
I believe the real Barbour circuit is carefully guarded, but this seems to be the basis; it's from Svetlana and may have even been an early Barbour design, not sure:

http://www.tube-town.net/diy/sv-6bm8/sv6bm8_02.gif

steven
Warning: the linked site above is a phishing tool.....or is contaminated with such a tool.
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