Why would the red work on the same chassis with one tube but not the other then? Not saying you are wrong I just am perplexed.If you got no red, most likely there is something damage on the neck board, not the tube! just swap the neck board to confirm this, then will be easy to address the issue just comparing the two neck board PCB , just testing any component in red line
I tried several times on both tubes with the same chassis and I get red when using my old tube.
I definitely thought it was a chassis issue at first too until I tried with my original tube again and got red.
I'll see if I can switch neckboards, i just remember in the past having trouble disconnecting the wires from the neckboard but I'll give it a try.
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