Bogen monster MO200A schematic

[Boris_The_Blade]

Hey there,

Does anybody have a schematic for a Bogen MO200A? I have one for the MO100A, but I need to see the power supply differences...transformer color codes. The MO200A has a different power transformer, and the amp I got is pretty old and messes with...I need a baseline for refurbishing it.

thanks

 

[Tedknowlegy]

I have 4 Bogen MO-200 amps. I traced out a schematic a while back and I will try to find it to post.
I have modified one amp to a stereo configuration.
I added a preamp to another one and used it as a bass guitar amp:awesome sound!
These are very heavy and have tremendous bass response.

 

[llwhtt]

If you are still looking for a schematic I have it. I too have four of those suckers.

Craig

 

[HollowState]

Does anybody have a schematic for a Bogen MO200A?

 

[Tedknowlegy]

Thanks, HollowState. FYI, the main issue I had was the bias supply filter cap. Once I replaced that and repaired the output stage (burned open plate resistors and burned open cathode balance pot) the amps came to life. These may not be true high-fidelity, but they sure do have a BIG tube sound that is very satisfying. I used a pair of these in my bass rig for years, until I got tired of hauling them around. So I converted one of them to stereo to reduce weight. I used that for a number of years until it became too burdensome. I miss that tone.