This is the older model in an all black case. I have upgraded some of the parts with higher grade ones including Kiwame resistors, Relcaps and Panasonic capacitors, FRED diodes, etc... Tubes are working fine, the amp is very quiet and sweet. The transformers are wired for high impedance output. I only used it with a set of HD600.
When installing the Neutrik connector, I damaged the finish a bit. I have put black electrician tape to cover the damage around the new receptacle.
I'm selling this amp because I barely listen to headphones anymore.
SOLD
Here's some info about the design:
http://wduk.worldomain.net/acatalog/info_HD83.html



