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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: How long did you run them in before hitting them with high voltage?

Well I do know when more current is needed the tubes will light up a lot more blue. When I use them on my headphone amp, they glow much brighter then on my Preamp.
I have seen on you tube where some old theather amps with MV tubes are glowing bright then lower then brighter again. like the tubes are dancing to the music

I think it happens when some good musical peaks happen as you said when some real lows freg. I won't worry about it.
Just so you know the globe 866 tubes seem to sound more musical, except for Unighted brand, they suck. RCA one are very nice.

I like your diffusers panels in your room.

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