Amp/Preamp Asylum

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So this happened . . . any thoughts on the cause?

Posted by JoshT on July 16, 2022 at 16:31:02:
This morning, when I turned on my system, I got no sound at all. After checking all the settings, I realized that the signal tubes in my CJ Premier 11A power amp didn't light up at all. There'd been no "event" that I'm aware of - the amp was fine yesterday but not today. The power tubes continue to light up normally - just not the little ones.

I will reach out to CJ naturally, but any sense of what could cause this? I'm fairly sure it's not fuses or bad tubes (anecdotally), but what do I know?

Thanks in advance for any advice!