Luxman L-210 + T-210L Tuner stopped working

Hi,

I hope this is the right place for this issue and question but vinyl + electronics noob here :)

I’m having trouble with my vinyl setup and would really appreciate some help.

Gear:

• Turntable: Lenco L75 (modded with RCA outputs and a ground post)

• Amp: Luxman L-210 (with matching Luxman tuner)

• Speakers: Klipsch R50M passive, wired to the Luxman

Symptoms:

• At first, the Lenco sometimes wouldn’t power on. Then it powered on when I turned the amp on, but I got a loud hum and only very faint music (almost just the mechanical sound you hear if you put your ear to the record).

• I connected the separate ground wire: one fork under the GND screw on the Luxman, the other under the ground screw on the Lenco. That reduced the hum and it suddenly worked perfectly for a while.

• After I moved some plugs at the wall and put everything back, the turntable still spins and the tuner powers on, but now there is no sound at all from the speakers – not even hum – on Phono or Tuner.

• I tried the usual things: checked volume, balance, speaker selector (A/B), tape monitor/source, muting, and speaker cables. Still no sound.

• I also did the “phono buzz test”: with the turntable disconnected, I set the amp to Phono and touched the center pin of the phono RCA jack with my finger. There is no buzz at all.

So right now:

• Turntable spins, tuner appears on, but Luxman outputs no sound on any input (Phono or Tuner).

• I don’t have an easy way to test AUX with another line source.

My questions:

1. Does this sound like a known failure mode on Luxman L-210 (speaker relay, tape monitor section, internal fuse, etc.)?