galaxiex, I have printed out your schematic and layout from post #19. Thanks, I think its the only one on the planet! I'm not sure about the schematic yet but the layout is somewhat different from the 40XL that I'm working on. From the pot date codes this one looks like a 1971. (Sears 257.142220002). Not a good sine wave @ the output on the scope when on channel 2, channel 1 is okay though.