Looking at the image you will see there has been a serious upgrade to the tranni brd. The two HT trannies I had in place just couldn't cope and I never got any where near a reasonable HT. Not only that the last part of the HT filtering was C-R-C. Because of such a low HT to start with this resistor stayed 1ohm. Useless for filtering. Now this limiting resistor is 1K and drops 37V across it.
Not hard to workout the total current for the amp is 37mA. 40MA would have been max so this is a nice safe "max". The 1K limiting R and 100uf 400V cap also provide the final stage of filtering. I increased the bias to -36V. The HT will generate 185V but I would need better than -40V bias to work with this. I though it better to bring the HT to 170V+ and make the bias -36V.
The amp appears to have much better drive and greater detail and much better bass. I would now say from a purely sonics point of views it may challenge the Silver Dragon 300B. While I had the amp apart I corrected the out of phase speaker terminal and brought the bias voltage to a test point near the standby switch. Now I'm very pleased.
Attachment:
Trannibrd.jpg
I have had one faulty tube from two matched pairs. I now have in-place the last tube (part of a second matched pair). All looks and sounds good. Now trying to get the eBay seller to replace the faulty tube.