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Old 24th April 2010, 08:01 PM   #1
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Question McGohan M506 PA Guitar conversion mods.

I have a Sweet McGohan M506 (50 watt) PA. It's a 1961. This thing is in "new" condition! All caps are very nice (2) EL 34 Mullards. All XLR input. I used a XLR modified guitar cord, plugged in my Les Paul (through 2x15" Celestions) WOW! POWERFUL! However, the tones stack is just not there. Needs some mids, maybe reverb (I have tanks). Running with no componants the crunch came on just fine, (actually got downright dirty,but no warmth). Playing clean with a RP50 processor sounded beautiful (just not a fan of processors). Really want to mod this into a "personal amp", just can't find "ANY" schematics! (original or mods). Anyone ever mod one of these beasts (built like a tank!) Anyone input greatly appreciated!Click the image to open in full size.
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Old 25th April 2010, 10:46 AM   #2
Trout is offline Trout  United States
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Quote:
Originally Posted by adddakid View Post
I have a Sweet McGohan M506 (50 watt) PA. It's a 1961. This thing is in "new" condition! All caps are very nice (2) EL 34 Mullards. All XLR input. I used a XLR modified guitar cord, plugged in my Les Paul (through 2x15" Celestions) WOW! POWERFUL! However, the tones stack is just not there. Needs some mids, maybe reverb (I have tanks). Running with no componants the crunch came on just fine, (actually got downright dirty,but no warmth). Playing clean with a RP50 processor sounded beautiful (just not a fan of processors). Really want to mod this into a "personal amp", just can't find "ANY" schematics! (original or mods). Anyone ever mod one of these beasts (built like a tank!) Anyone input greatly appreciated!Click the image to open in full size.
Though not making tube amplifiers anymore, I believe McGohan is still located in Northbrook IL.

McGohan Electronics, Inc. - Home

mcgohan.electronics@gmail.com

If you contact Jim McGohan, it is very likely you could get a copy of the schematic, I know he supplied them for other models in the past.

Good Luck

OH, BTW, that amp came in both 50 & 100W versions.
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Old 25th April 2010, 02:32 PM   #3
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Thanks Trout, I'll give it a shot.
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