Re: Philicorda GM751 organ
The circuit diagram you have linked to shows a unit with a stereo amplifier and the spring line getting an output from one channel and feeding it into the other channel.
The notes are generated by neon oscillators.
There are no lock fits in it.
The photos show a mono amplifier with some lock fits in it and the notes being generated by oscillators with lock fits in them.
The output from the spring line is there as you have tested by tapping on the casing.
The input must be missing.
A common fault is an open circuit driver coil.
In the old days spring line drivers were made by stripping a cheap battery radio for the audio transformers and using them.
If you do find that the driver coil is open circuit and open the spring line up up you will be able to see what I mean about stripping cheap radios for there transformer parts.
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