Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Bogen CHB35 Mods and Preamp ideas
Bogen CHB35 Mods and Preamp ideas
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th September 2006, 08:06 PM   #1
gtrbryan is offline gtrbryan  United States
diyAudio Member
Join Date: Sep 2006
Default 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


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.
  Reply With Quote
Old 25th September 2006, 11:52 PM   #2
Enzo is offline Enzo  United States
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.
  Reply With Quote


Bogen CHB35 Mods and Preamp ideasHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Preamp ideas for F5 ejfud Pass Labs 474 8th November 2016 03:18 AM
Discrete Op Amp Ideas for a Preamp analog_guy Solid State 16 16th June 2007 04:18 AM
Bogen CHB-35 Preamp Mod gtrbryan Tubes / Valves 0 13th March 2007 07:05 PM
Searching schematic for Bogen sound system LOL tube preamp Lily Instruments and Amps 3 10th January 2007 09:38 PM

New To Site? Need Help?

All times are GMT. The time now is 02:09 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio