my least favorite ac30 version, but that doesn't mean its bad
I had a late arbiter for some time. The PCB version.They went from handwiring to PCB around the time they ran out of alnico speakers (which were discontinued but when they bought Vox from Vsel, Arbiter got a stock of NOS silver alnicos and most of the handwired arbiters have those as far as I know). Ariter, even before going PCB, went with a solidstate rectifier over the GZ34 giving this amps a pinch more headroom and punch than a JMI ac30. Coupled with blue vox labeled 70s kurt mueller coned G12Ms it was the marshalliest vox ac30 I've ever heard. A very good amp but I was frightened by the PCB in the classic, poorly ventilated ac30 cab and it was just enough louder than any other vox, even with the lower efficiency speakers that I could never let her rip fully, and the medium ceramic magnets just don't produce the rich cleans of the alnico speakers. Perhaps the full compliment of mustard caps added to its unique voice versus my wima equipped 62.... if you believe in capacitor mojo.