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Old 24th August 2013, 07:23 PM   #1
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Default Need Pinout Help, Silvertone Organ Amp

I have a Silvertone (nee Thomas) amp model 4722, chassis 157.47223. It worked when it was removed from the organ., but the remover did not bother to trace the pinouts. I need some help figuring out which pins/connections to use for input and output for a guitar.

Here's the top from either side:
Attachment 367522
Attachment 367523

And here's the bottom, left side is power/output, right is input. The volume control (previous had a pedal on it) sticks out the right end. There's a few on the outside of the left end.
Attachment 367524
Attachment 367525
Attachment 367526

There's a switchable 1/4" TRS jack on the output side, one leg to the transformer, the other an orange wire going to the multi-pin plug.The input plus has a bunch of wires to connections along the edge of the board, plus a couple (orange and red) going to the other edge(s) farther away.

I have no SAMS nor access to any. Sears doesn't have anything on this model.

Can anyone tell me what wires/connections/etc. I need to hook into on the input and output sides?
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Old 24th August 2013, 07:31 PM   #2
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Sorry, the attachments are showing as invalid. I've contacted admin about it.

Still, if anyone has anything on the 4722, I'd appreciate hearing about it.
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Old 25th August 2013, 05:37 PM   #4
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Hi,
Here in this link you will find the schematic for the 4722:
Sears Silvertone Radio Schematics
Good luck
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Old 25th August 2013, 10:49 PM   #5
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Thank you for your help. Unfortunately, Sears/Silvertone had used that model number previously, for a 1938 radio intended for farm use, and that is what he has available. The item I need is more specifically chassis number 157.47223. However, someone with such an extensive collection of vintage schematics he may have access to or know of a source for the correct material. I have already asked him, so your assistance may yet prove productive. Thanks again.
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Old 25th August 2013, 11:53 PM   #6
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Hi,
Your welcome.
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Old 26th August 2013, 03:12 PM   #7
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Unfortunately Steve Johnson has no advice on locating one. Anyone else have suggestions? I'll try posting in the Tube Amp section, as previous questions on this and similar amps have been posted there.
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Old 26th August 2013, 05:45 PM   #8
scrimpu is offline scrimpu  United States
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I have a few thomas/silvertone schematics. do you have the amp with 4 tubes or five?
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Old 26th August 2013, 09:16 PM   #9
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Seven. Four on the PCB, three in the power section. Placed as so:

https://dl.dropboxusercontent.com/u/...37/4277top.jpg

Not only do I need to find hot and ground for both input and output (I suspect I've found both are grounded to chassis) but one side the AC line goes through the fuse to the output side plug, and ends there. No jumper on the plug. Pilot lamp line to the organ before returning to do its amplification task? If so, what line from the plug?

Last edited by drmcclainphd; 26th August 2013 at 09:16 PM. Reason: specifying which plug a wire goes to
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Old 27th August 2013, 02:26 AM   #10
scrimpu is offline scrimpu  United States
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I don't have a schematic for that one, usually those had RCA jacks for the input and power switch and speaker leads run out from a large plastic connector near the power transformer.
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