OK. I know this is the place where folks in the know hang out and maybe someone has an idea about this. My one year old DRRI is sounding ill so the first thing I checked is the power tube bias. I'm using one of those probes that is plugged into the socket and the tube is then plugged into the probe socket. Lo and behold the V8 6V6 is right at 25 milliamps right where I had set it about three months ago. BUT, the V7 6V6 is reading NO current at all. V7 is also only warm to the touch (it still lights up) and not hot like V8. I switched tubes around and even tried some different brand 6V6's in V7 with the same result. So the socket is the culprit and not the tube. I'm wondering if anyone has encountered this situation and what I might do to get this DRRI up and running. When it's working properly the thing sounds glorious. Thank you in advance !!!