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Ok - pretty sure it's the preamp. Found an old thread that suggested plugging a guitar amp to the preamp out and same issue occurred. So I'm guessing the power amp is fine. Going to try reflowing the joints on the preamp. 

Hello! I recently acquired a 1975 Rhodes 73 with Super Satellite System. When using the master amp through the 4 pin cable it makes an odd noise (attached). It only sounds when pressing multiple keys. When going through the Preamp output A on the master, from the quarter inch accessory plug it works perfect, same as going from the accessory direct to the slave amp. Is this an issue with the preamp? Cold solder or bad caps? I've attached pictures of the circuit boards. Any help/guidance would be incredibly appreciated!


https://imgur.com/a/rhodes-SasAsna

(I think I originally posted this on the wrong part of the forum)

Hello! I recently acquired a 1975 Rhodes 73 with Super Satellite System. When using the master amp through the 4 pin cable it makes an odd noise (attached). It only sounds when pressing multiple keys. When going through the Preamp output A on the master, from the quarter inch accessory plug it works perfect, same as going from the accessory direct to the slave amp. Is this an issue with the preamp? Cold solder or bad caps? I've attached pictures of the circuit boards. Any help/guidance would be incredibly appreciated.


https://imgur.com/a/rhodes-SasAsna