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  1. Lockheed Mar

    Mixed 12AT7 tubes for MC275 MK VI?

    Hi everyone, Des the MC275 can run normal with mixed 12AT7 tubes? I've two MC275 MK VI and recently change 4 pairs of 12AT7 (2 pairs per amp). The problem is I have 3 pairs CV4024 Mullard and 1 pair 12AT7 Brimar. Thank you very much for helping :)
  2. Lockheed Mar

    MC275 Mk. VI with Raytheon 6414 tubes?

    The 12AT7 tubes on my MC275 Mk. VI are old and need to replace. Could I use these Raytheon 6414 tubes on 12AT7 spot. Thank you.
  3. Lockheed Mar

    Monoblock MC275 50th Anniversary tube rolling help (12AX7 on V3, V5 position)

    Hi everybody I have a question about tube replacement for my MC275 (50th Anniversary version). My MC275 is running in monoblocks, so do I need to replace two 12AX7 on V3 and V5 position or just one of them? Which tubes (NOS) I should buy? I have Mullard CV4004 on C2300, Shuguang KT-88Z on...
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