[Jayce]

I agree on the 19T8 about NOS tubes failing. I have had at least two develop shorts after only a handful of hours of play and the were NOS. I've also had 12AT7s suddenly just go kaput on me. It also wouldn't hurt to swap in another 35C5 or even a 50C5 as the radio won't mind with today's higher voltages to see if that helps. From my experience I have had tubes that test great, but make every radio I try them in sound bad. That's about all I can offer.