Hi Jim
Thanks for those tips. I have ordered the HT57's
You dont have the?? changes required for the GM3SEK triode board to use it with the YC156? I have a board set up for a 8877 but there is no details for the YC156? changes in his manual. I can see the mods for the higher bias voltage which I have already done. Is there anything else that has to be done to this board for the YC156?
Henry