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Old 26th September 2013, 08:03 PM   #1
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Default solid state organ amp conversion to guitar

Question from a noob... attached are pictures of a solid state baldwin organ amp. Could anybody help me figure out where to attach the guitar input, speaker output, and main volume control? This is my 2nd organ->guitar amp conversion... but I was stupid this time, and didn't trace the wires to their ultimate purpose. thanks!
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Old 26th September 2013, 08:44 PM   #2
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That's not solid state.

And it was a mistake to not figure out the connections when you removed it.
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Old 27th September 2013, 12:55 AM   #3
Enzo is offline Enzo  United States
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What do you mean "not solid state"? I see no tubes, and I do see transistors in the interior photo.
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Old 27th September 2013, 01:47 AM   #4
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I agree - it was a mistake... but maybe I could systematically check the different wires leading into the round & rectangular sockets. Guess and check is sometimes a viable option. Fast Eddie, if it's not solid-state, what type is it? Thanks for the help.
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Old 27th September 2013, 02:45 AM   #5
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Quote:
Originally Posted by Enzo View Post
What do you mean "not solid state"? I see no tubes, and I do see transistors in the interior photo.
I see point to point wiring. It's old, old school; not that there's anything wrong with that.

Last edited by Fast Eddie D; 27th September 2013 at 02:48 AM.
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Old 27th September 2013, 02:49 AM   #6
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Quote:
Originally Posted by jimham12 View Post
I agree - it was a mistake... but maybe I could systematically check the different wires leading into the round & rectangular sockets. Guess and check is sometimes a viable option. Fast Eddie, if it's not solid-state, what type is it? Thanks for the help.
I would like to help you, but it's nigh on impossible to do it from the photo. I do wish you luck though.

You wouldn't be the first person to convert an organ amp to a guitar amp. It's a pretty good idea.
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Old 27th September 2013, 10:46 AM   #7
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the round sockets are actually the female receivers for cables that would connect to external tone cabinets (speakers). The 5 pin socket on the right was used to connect the power switch and tremolo controls. The 6 and 7 pin sockets were not being used in the organ when I picked it up. Thanks for any and all comments!
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Old 27th September 2013, 12:59 PM   #8
wg_ski is offline wg_ski  United States
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If remote cabinets mean speakers, then that's a no brainer. Look for a wire that comes off a big electrolytic cap, and goes back to the power transistors. Speaker from there to ground is a good bet.

The input side is somewhere over on the left. I see three small signal stages. Look for a blocking cap (probably ceramic) that connects to the base of one of the transistors, and then goes off to some connector. Try putting your signal in there and see what happens. For a volume control, just put a pot between there and your signal. I also see an electrolyic (lower left) that's leaking and should be replaced before trying anything.
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Old 27th September 2013, 01:32 PM   #9
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Your thoughts are ultra helpful - thank you! I'll post updates once I've tried your ideas.
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Old 30th September 2013, 12:40 AM   #10
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another realization... the manual for the Baldwin organ says that the organ has 3 separate transistor amps... so, I found 3 smaller transformers (output transformers?) in the upper section of the organ (each with it's own potentiometer). Could the designers have made this one power amp section and then linked up to the output amp section? Is it possible that the amp shown in the pictures won't really work without at least one of those transformers? If that's the case, then I'm in over my head, and I might just scrap the thing for parts, buy a partial kit, and start from scratch (with idiot-proof instructions!)
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