Problem with biasing

Hi Kelly.

My systems are shown under my user ID.

I have Audio Research Reference Phono stage, preamp, DAC/ CD player, and amps, Woo head amps WA6, WA6SE, WA 5, and a PrimaLuna integrated amp. I’m thinking about $100 in the last ten years. I had to replace the Prima Luna tubes, and I traded in my Audio Research Reference 5SE for a Reference 6SE before it needed new tubes.

So, I think this is why folks talking about the theory and reality of tubes are so far apart. I had a Sonic Frontiers tubed CD player for fifteen years… the cd transport needed changing out three times, the tubes, none.

😊👍

Tube problems are not common, but if you get a whistle, bright tube, or weird poping, that is the place to start. Because most tube equipment uses more than one of the same tube, diagnose can take a couple minutes. 
 

My systems run over forty tubes and I get a strange sound every couple years or so… typically associated with a new or relatively new component. 

Try switching tube positions. Does the bright glow move? If not refer to @oddiofyl, if it moves replace the tube.