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    Tube red plating the first 2 seconds only

    I got 8 nos cv4024 (12AT7) When I start my amp MC275 they glow bright orange the first 2 seconds I think they are red plating After that they are fine and sound great is this normal ? Same thing happens on my tube tester Hickok 6000 on all 8 of them. They test great. Only happens when I power...
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