Well here they are! Issues are as follows...
RC-656C
- Volume knob a little scratchy
- Both channels working on mono, left channel working intermittently on biphonic / wide, stereo
- Tape deck play, fast forward, rewind functions all work but nothing but a loud, deep hum comes out during playback
- Tips of antennae are gone
RC-727LB
- Oxidization all over top metal controls plate, sliders very hard to move
- Tape door plastic missing, measured it (5.5cm x 8.2cm) will cut a piece of clear plastic to size
- Belts haven't melted but they're pretty hardened, deck wants to play, fast forward and rewind but after some short movement, it slows to a stop. Also humming during playback
- VU meter bulb burnt out
The 727LB does indeed have a voltage selector switch, beneath the unit on the underside. Was able to pickup both for the equivalent of $135 US
Update: Read somewhere to repeatedly press record / stop over and over again to eliminate the farting sound. It worked on my first try and the tape sounded great! There's way more bass and fidelity in the 656 than its size made me think it had! Looks like a bunch of deoxit is getting sprayed into it tomorrow.