why 12ax7 may test weak on BK 600-606
A reader asked me why 12AX7 were testing weak on a BK 600 tube tester, but testing OK on a BK 707 (top panel Gm test). The 600/606, and the bottom panel of BK 700/707, will overdrive a 12AX7 at plate(cathode) current levels that a 12ax7 tube is not really designed to handle. [FYI – […]
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