Following your advice for a similar problem, I tested the cartridge leads. Two of them did not respond when I touched them (as expected), the left lead buzzed when touched, but the right lead did not respond to the touch at all. Is this likely a cartridge problem? I tried this using two different amps so I don't think a faulty pre-amp is the problem.
If you have disconnected the cartridge and touched the leads in that state and you had no sound out of the right channel, then there is nothing wrong with the cartridge at all. You either have a bad lead from the deck to the amp, or a bad connector to the amp. If replacing or fixing the lead does not correct the problem, then you have to look at the pre-amp in your amp as the cause. The amp will have a dedicated magnetic cartridge pre-amp. It's failure on the right channel will not effect any other function, such as tape or radio. You can easily find the cause, by tracing the phono connector wires back (inside the unit) to the first port of call on the PC board. You will either find a single IC doing most of the work of the pre-amp or two IC's, one for each channel. If you are lucky and a single channel IC does the work, replace the right hand one. Otherwise replace the dual channel one.
If you think it's the cartridge, then remember that putting the left channel connector on the right input of the cartridge should see no sound. But if you hear sound by switching the cartridge connections the cartridge is good.
I have noticed that you have tried another amp with the deck and it made no difference. This implies then a faulty lead between the deck and amps.
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