[Tony V]

Yes, that is a power resistor and they look that way even when new as they are covered with a sand like material when made as an early attempt at disbursing heat since these get extremely hot. Obviously is ok for now if your tubes are lighting ok. Did you try touching the leads that go to the cartridge and see if you get a humming noise? If you did then you might have a faulty cartridge as these were well known for. Some of the changers in these had a mute switch connected inline with the cartridge leads underneath to mute the sound when the changer goes through its cycle so check and see if it has one and if so make sure its engaging and disengaging. Worst case on this switch you can bypass it temporarily until you go thru the rest of your checks. If your not getting no sound what so ever then recheck your caps to make sure nothing got hooked up backwards or wrong during your recap which is easy to do in such a small space. Also check your output transformer that goes to your speaker as sometimes powering it on with bad caps will short this out. If everything checks out ok then you'll have to get a schematic and start measuring the values on your resistors as one might be open or way off in value. Good luck!
Tony