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6550s highest plate voltage: JJ or TungSol?

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  • 6550s highest plate voltage: JJ or TungSol?

    I've been thinking to replace my sextet for vintage SVT and I have JJs here, new set.
    Those which are in my SVT are TungSols from new production. There's no data sheet for new prod. Tung sols, everyone is linkign to the 50/60s data sheet and we all know these tubes aren't the same.

    JJs max 600V max
    (old) Tung Sols 660V max
    where SVT have over 700 at the plates...

    Does anyone know what is the max plate voltage hadling for tung sols new production?




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