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power tubes

  1. What tubes can I use in my amp?

    Amp Building/Technical/Repair
    more specificity, it’s written on the amplifier that it uses EL34 or 6L6’s and I have 6L6’s on hand and it appears that 2 of the 8 pins have been pulled out of all 4 tubes. What is the purpose of this and are these tubes any good with the pins missing?