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6gh8a

  1. Synergy

    EL34/6CA7s + 6GH8A + ECC83/12AX7s ... Superb !

    Sweetest sounding amp with EL34 / 6CA7s + 6GH8A + ECC83 / 12AX7s and all selfmade transformers. Added a stereo bluetooth though, but its switchable. Demo video
    • Synergy
    • Thread
    • 12ax7 6ca7 6gh8a amplifier ecc83 el34 vacuumtube
    • Replies: 15
    • Forum: Tube Audio
  2. David_NC

    6GH8A Reading Backwards on Tester?

    I recently received a pair of NOS GE 6GH8As to use with adapters in place of 7199's in my ST-70. I have a Hickok 533a, so I thought it'd be a good idea to test them before putting them in my amp. The first one tests fine, though I had to use 6U8 settings (I cannot find the settings for 6GH8As...
  3. J

    ST70 7199 / 6GH8A amplitude vs frequency

    Ive posted a 1 off video showing my issue of the amplitude change of the 7199 outputs in which the change increases with the frequency. I found something, however even though it corrects the amplitude, the phase does not align, tested with both a 7199 and a 6GH8A Surely this is masking another...
    • JRUBIN
    • Thread
    • 6gh8a 7199 frequency imbalance phase st70
    • Replies: 102
    • Forum: Tube Audio
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