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hickok 533a

  1. 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...
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