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The 6688  (European: E180F) (Russian: 6Ж9П) is a miniature high-slope VHF/UHF pentode tube with a B9A (Noval) miniature 9-pin base, primarily intended "for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment".

It is used in:

  • the staircase generator circuit of the 3T77
  • the P80 cathode-follower probe
  • TR-4602, Hungarian 551 clone
  • the 526

Tek part number: 154-0215-00