I have a JCM 2000 TSL I just installed the Dr Tube Stable Bias Mod, new bias trim pots and a Classic Tone choke into. While testing I'm plugging it into a current limiter that I built out of a 300 watt light bulb and receptacle like the one Uncle Doug uses on his youtube channel. When I turn the power switch to the amp on the power switch light lights up and the bulb on the current limiter glows (very dimly just the filament in the bulb glows slightly) then after a couple mins on standby I take it off standby and it burns a lot brighter and then the power light on the amp switch goes out after a few seconds. Things I did to recheck my work... I took the mother board back out of the head and found that pin 5 (that I had isolated from the motherboard) on 3 of the sockets had pulled almost out of the sockets and was almost protruding out the top side. So I pushed them back into place and twisted them like the others so they wouldn't pull through the slots again when removing the tubes. I checked out all my solder connections on the bias board I built with a continuity meter to be sure none were bridged and they all passed. I double checked all my wire connections to the bias board mod and they were in the right places and none bridged. I had already soldered in a deans connector (all I had on hand) on the wires of the choke so I could unplug it to do future servicing/modding ect.. ,so I unplugged it from the choke and alligator clipped the R71 resistor to the other end of the deans connector so it was back into the circuit to test and it still lights up. I unplugged all the tubes and tried it and the bulb doesn't light up, so then I put the 2 outside tubes in and it lit up removed them and put in the 2 inside tubes and it lights up. The tubes I'm using are the old ones the amp had in it before installing the bias mod (they haven't had much use on them at all since this is a spare amp) I do have a new set of Groove Tubes but don't know if I should try them yet or not don't want to damage them. What should I try next?