Re: SG502 Schematic, Component Layout

Jeff Davis

Very different, indeed. I'm not even able to correlate parts with the schematic. For example, I'm looking for the square wave current source transistor, Q235, by searching for its 3 bias resistors, a 1K, a 3K, and a 510 ohm. I can't find a 510 ohm or a 3K ohm anywhere on the board.

All this, plus the hand-made cutout makes me wonder if this might be a prototype or some other kind of lab curiosity that somehow escaped into the world.

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