Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: DummyLoad on April 19, 2012, 01:11:28 am

Title: bogen CHA-20 hack.
Post by: DummyLoad on April 19, 2012, 01:11:28 am

hacked out a guitar amp from a bogen CHA-20. stripped the phono input, level, and filter, cathode biased V1a and tweaked a couple of grid stoppers. cool sounding amp.

attached schematic in .GIF and .SCH formats.

--DL

Title: Re: bogen CHA-20 hack.
Post by: tubenit on April 19, 2012, 05:08:09 am

That's the same amp that I built my first Carolina Blues Special out of.  Nice amp.

What are the preamp plate resistors?

With respect, Tubenit

Title: Re: bogen CHA-20 hack.
Post by: DummyLoad on April 19, 2012, 12:05:02 pm

That's the same amp...    :icon_biggrin:

they do sound very nice.

new owner loves his. new owners hound blue-bell died, so i gave him something to help cheer him up.

i have attached corrected files - my apologies for the errors.

--DL