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6u8

  1. B

    Caution on using 6GH8, 7687, 6U8 tubes to replace 7199 or 6AN8 in phase splitter circuits

    The pin out for the 6GH8, 7687, 6U8 tubes has a design weakness when used in a phase splitter circuit that can cause high frequency stability issues with some amplifiers originally designed for the 7199 or 6AN8 tube. The 6GH8, 7687, 6U8 tubes all feature the pentode grid (pin 2) right beside the...
    • Bob@Blue5
    • Thread
    • 6an8 6gh8 6u8 7199 7687 high frequency stability phase inverter phase splitter
    • Replies: 39
    • Forum: Tube Audio
  2. Walter R

    6F1P as Substitute for 6U8

    Does anyone have experience using a Russian 6F1P tube as a substitute for a 6U8? The pin out appears to be the same. I can’t translate the 6F1P data sheet in Russian, but the characteristics appear somewhat different. Walt
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