This amp runs the power tube plates really hot (I think they measure around around 600VDC at 120VAC) and I have really only had good luck in terms of long-term reliability and stability on the road with the Gold Lion reissue KT88 in the power section and likewise the EHX 6550, which is a fairly similar tube. IIRC you have to disconnect a lot of terminal spades from the transformers.

The circuit boards aren’t super fun to work on. The screen grid resistors should also be replaced with a way better quality part (I like Ohmite 40 series, part #45F1K0E or 45J1K0E I think) They are pretty standard footprint radials / snap-ins so you can get good computer grade long life caps for this application. Orange was using pretty junk filter caps and they seem to go bad. I have fixed several of these, all manufactured around 2008. I see this traced preamp was posted above by CJ but here are the other docs I have. If the amp is indeed an Orange AD200 as others suggested above, here are some tips: Mesa might provide you with it since it’s a legacy product. I noticed people on this forum are using alternative switching systems - is this because it is superior to the Mesa system, or they can't find a suitable circuit to replace switching pt.2? I personally think that Relays are more reliable and the 'mute bus' is quite a good idea, and am going to try and re-create it (I want to buy a Rectifier footswitch on eB*y etc).Is the amp in question a Mesa Bass Buster 200? I couldn’t find any schematics to help out. I also noticed the Switching Matrix pt 2 is missing from the 3ch Rectifier schematics, but I studied the Nomad 100 schematics where a similair logic switching system is used with the LM3914 bar/dot driver, where different voltages on the SWB buses are used to drive the LM3914 which in turns on FETS that in turn trigger Relays for the various switchign functions. Hi Killigrew, I've been following your Rectifier project on this forum, congratulations on such a fine build :) Which you have to redesign to get the Channel Switching and Footswitch to work.

The 3 Channel Rectifier Schematic is correct but it misses some Parts People here have been building the 3ch Rectifier - is it correct? I'm especially interested in knowing the accuracy of the mkIIc+, mkIV and 3ch Rectifier schematics. Wish me luck :bier:Īuf schaltplan vielleicht es gibt einige fehler oder einige elektronisches Bauelement mit anderem wert I have started to build a 3ch Rectifier and am soon going to need the help of all the good people of this forum. What about the Mark IV and Mark IIC+ schematics? Which Mesa Boogie schematics have been discovered to be false? I have the 3ch Dual Rectifier schematics, are they correct? I wish my German was good so I that I could join in more on this superb forum! Sorry that I have to post in English :)

Mes boogie schematics