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Well I traced out the audio circuit and drew up the changes. I'll attach a pdf of the "before" and "after" the audio mod was done at the factory.
Some comments are in order.
1) SAMS made a mistake and reversed the polarity of Cap C3. This was confirmed by looking at the picture of the resistor location in the actual SAMS folder.
2) I eliminated the extra switching shown on the schematic showing switching for a combo unit. Mine is a table top model.
3) With the audio mod there were 3 components added not counting the tube. R79, R80, and C64. I gave them these designations to continue with the SAMS.
4) R37 was changed from 82K to 1.5MEG, R35 from 10MEG to 5.6MEG, R32 from 12K to 13K.
As a general observation, I noticed that about 10 to 12 resistors are different values from the schematics. Consistent was the change from 47K resistors to 39K and 12K to 11K and 13K. Could have been caused by parts shortages?
You guys that are more knowledgeable than myself, could you look over what I drew up and give me your comments? I drew up what I saw on how the chassis was wired.
Thanks.
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