Thread: Bogen CHB-35A - rebuilt for the millionth time (it's staying this way)

So over the past year or so I've tried quite a few things with this Bogen CHB-35A that I had kicking around. It's a bit of an oddity because it runs on 7868's in the power section. I think they sound really good, and so I designed a new amp around that original bogen power section.

I have pics of the original gut shots in this other thread, as well as my first attempt at doing a rebuild on it, and then retrofitting it into a vox ac15 combo cab.
Converted Bogen CHB-35A PA amp to guitar amp, fitted into vox ac15cc cab (pics/clip)

I've since gutted it again and built it with a completely different preamp (which I happen to really like). The preamp is pretty much a dead on marshall 2204 layout right up until the PI. I only have a single triode for the PI, so I have to use a different type of PI than the 2204, and so from that point on I'm using fairly close to the original bogen layout.
I also built the whole thing on a turret board to keep things tidier. I think it's turned out really well. It's still a beast of an amp, not pretty at all, but I really like it and it's much more solid than it was before. I wouldn't hesitate to take it out gigging now.

Here's the schematic I'm running with currently (red lines are shielded cable):
http://home.westman.wave.ca/~vwtweak...uly10%20jp.jpg

The Presence control is a bit of an oddity also.. It's wired into the tone stack, and it almost seems to be a combination presence/depth control. I like what it does, so I'm leaving it.
I also wired in a switch to have low or high gain on v1b. It gives a nice contrast.

Here are some pics of the newest build:













I've learned so much from this amp, It's really been an awesome tool to have around, and I'll be leaving it as it is now.. Might change out the speaker but that's it.