BOGEN CHA 33.wmv

Bogen Model CHA 33 class A tube PA head made in Paramus NJ by the Lear corporation.

Comes with 4,8 or 16 ohm taps on the output tranny. Would sound killer through a 4x12 Marshall cab.

I took this 60's Bogen 30 watt PA head and replaced the input and output with a couple of 1/4 inch jacks, plugged in a Telecaster with a JB in the bridge, hooked the output up to a stock 4x10 Marshall Valvestate cabinet, turned it up and let her rip. This amp is mostly stock with one replaced filter cap. I've also changed the phono control into a master volume control. It has got to be the loudest 30 watts I've ever heard. It's running push pull class A with (2) 6L6 power tubes, (2) 12ax7 preamp tubes, (1) 6AV6 preamp tube and a 5U4 rectifier. Not bad right out of the box. Volume knobs interact with each other just like on an old Tweed Deluxe or Marshall.

Category:

Music

Tags:

• Orange Tiny Terror
• Vox Night Train
• Tweed Super
• Marshall

[CedarSpringsProd]

I have a CHA 33. I really want to make mine have this sound. How did you mod it to drive the channels with the phono control. What other changes have you made? It sounds great!

[tonehound1]

@CedarSpringsProd I'm glad you like it. Circuit is stock. I just added a pre-phase inverter master volume in place of the phono control, kind of like the MV on a JCM 800. So you get some pre-amp distortion along with class A power amp distortion when you crank it a little. And it's always cranked a little

[ingeniousblues]

Nice Bogen, and no fender mods all through it... Like it should be.