3 hi-fi amps (with some issues) (Halifax HX1)

hi everyone! i have three old hi fi amps to find homes for. they all have some hopefully minor issues with the speaker connections. perhaps an electronics project for someone?

1. Technics SU-V45A

Main Left Red - loose
Main Right Black - stiff
Remote Left Red - very stiff
Remote Right - very quiet

2. Technics SU-V45O

Remote Right - silent

3. Denon PMA100M
Main Right - silent

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