Conrad Johnson Premier Four
By way of a stutus update of sorts Here is the PCB from my Conrad Johnson Premier 4. This is not short on parts for a tube amp either.
http://www.saabphotos.com/gallery/al...0/DSCN1007.jpg
Power supply for input tubes is regulated in these amps, checkout all these diodes that are wired in series. This keeps the semiconducters that do the regulating close to the HT rail and with only modest voltages across them.
The opamp at the top is one of several comparators used for turning on an LED to help bias the output tubes.
http://www.saabphotos.com/gallery/al...0/DSCN1013.jpg
After some work I managed to get this going using half of the output tubes while I wait for parts to arrive.
http://www.saabphotos.com/gallery/al...0/DSCN1020.jpg
Getting 6CA7s for this is troublesome/pricey, and I have seen a lot of negative things written about this amplifier on the internet. The UK mag review(s) when this came out were IMHO not very fair to it. Hope to redress this a little.
But even with half the valves this amp sounds fabulous.