Audio Research or Luxman?

Hey Jerry,

I own a 507ux and have compared it with modern ARC 75W integrated and I really prefer the Luxman.  In extension, the Luxman makes speakers sound bigger, and the extension at the top end is better without a hint of harshness or grain.  They also have a lovely tube like midrange, but it's not at all juicy. 

I head the 50x line is being discontinued so right now may be a great time to find a bargain.

Best,

Erik

Before throwing the towel in on the ARCs, ensure the tubes are fresh and well-rolled. Iffy tubes can take an amp down a few pegs.

Yes , check the bias on the KT150s is on point , additional expense I appreciate however pre 1990 production S Petersburg reflector 6h30- DR make a significant upgrade in fidelity compared with the ARC supplied later production tubes 

tastes change, there will be a ready market for the ARC gear. A competent tech should be able to gin up working potentiometers. Music Reference still has some NOS Nobel pots in tock, both stereo and mono in a variety of values. Just my $ or ¥
 

I am a discrete ladder robot in a continuous arc about the Sun

Also, check FleaBay, many Japan vendors of vintage Luxman gear, perhaps they have a line on parts in country…