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Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Hi guys, I've acquired a Viscount C.110 electric organ (looks like late 1970s..?), and there's two access holes on the back. One permits changing of a fuse, the other goes to a plastic potentiometer shaft (which is on the board with the large output power transistors). This single rear potentiometer is very scratchy and pops and crackles explode from the speakers when I touch it, but I am unable to determine its purpose.
I'm too much of a wimp to turn this pot very far -- can anyone tell me what it does? Initially I thought it might affect the pitch for tuning purposes, but then realizing the frighteningly old nature of the electronics, I doubt that would be possible.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Wow, this one must be a real mystery!
I don't want to turn this conspicuous looking potentiometer and risk inadvertently messing up some carefully calibrated bias voltage. The reason for my curiosity was because I have a small digital keyboard whose pitch did not match the pitch of this organ, and wanted to align them.
After pulling open the digital keyboard to find the crystal, there were two 33pF capacitors on either side as usual. I replaced one of them with a 100pF variable ceramic, and was able to detune it enough to get the pitches of the organ and the keyboard to line up. Problem solved! =)
So far I have removed a dead rat (smelly) and several decades worth of dust (yucky), replaced one transistor on the B tone generator board, and carefully repaired some broken plastic assemblies in the keyboard action.
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Electric organ rear potentiometer
