I've been slowly getting parts for a d3a 6c41c set. I just got the 6c41c's in the mail from somewhere in the former soviet union. These are cool looking tubes! I'm on the list for the d3a experimenters board so I can fiddle around with how I'm going to drive the 6c41c. I thought I would start with Bas Horneman's schematic found here. Although I'm open to LEDs and other arrangments. There was also a 300b amp on Audiocircle that had an interesting d3a arrangement as well... Anybody else use this tube? From what I've read so far you run this tube with lower voltage, atleast compared to my Kt-88 or 2a3 amp.