Bogen CHB35 Mods and Preamp ideas

gtrbryan · 24th September 2006, 08:06 PM

I acquired a Bogen CHB35, which is virtually identical to the more common CHB35A but with a tube rectifier. Schematic is below

http://us.f13.yahoofs.com/bc/441c56e...rDuFFBnQXXzMkZ

I first plan on replacing the caps, which needs to be done, and of course wire the input jacks and output jack for guitar.

I am thinking of modding one triode of the 6eu7 (V1). That way, I can have two distinct sounds out of this amp, essentially making it a two channel amp. Any ideas? Does anyone see any problems of modding one triode like a fender preamp stage. Would this give too much gain with a total of 3 preamp stages? The second two look like they are wired pretty cold. Maybe a GA5 preamp stage?

Any help is appreciated.

Enzo · 25th September 2006, 11:52 PM

FOlks convert these all the time.

Go to Schematic Heaven and there is a section on old PA amp conversions. Might find some good stuff there. And a million schematics too.

24th September 2006, 08:06 PM	#1
gtrbryan diyAudio Member Join Date: Sep 2006	Bogen CHB35 Mods and Preamp ideas I acquired a Bogen CHB35, which is virtually identical to the more common CHB35A but with a tube rectifier. Schematic is below http://us.f13.yahoofs.com/bc/441c56e...rDuFFBnQXXzMkZ I first plan on replacing the caps, which needs to be done, and of course wire the input jacks and output jack for guitar. I am thinking of modding one triode of the 6eu7 (V1). That way, I can have two distinct sounds out of this amp, essentially making it a two channel amp. Any ideas? Does anyone see any problems of modding one triode like a fender preamp stage. Would this give too much gain with a total of 3 preamp stages? The second two look like they are wired pretty cold. Maybe a GA5 preamp stage? Any help is appreciated.

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25th September 2006, 11:52 PM	#2
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	FOlks convert these all the time. Go to Schematic Heaven and there is a section on old PA amp conversions. Might find some good stuff there. And a million schematics too.

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