I just got about 2 hours of fonctionnement.J have already tested technics (op-amp), toshiba (op-amp + transistors), Vincent (tube / transistor) and many other brands (nad, cambridge. ..)
Here the signal footprint two op-amp's, it's all his actif.Le is correct: little wind and no hum. Good depth, good bass and treble end. It is too early to say more.
I usually leave it up to nine such old unit and I put the best of the world capacitors and op-amp's known that I know and then I re-judge and it was always better after réfection.Je redonnerais a notice in the away, but already it sounds great as it is, ie home.