Custom NL Counter

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Custom NL  Counter

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Custom period counter
  • The counter decades are incomplete, missing two tubes each.
  • The type of tubes is unknown, but HP used counters like this in the early 60s
  • and their decades are probably identical.
  • There are another 11 tubes on the chassis, probably
  • the pulse forming circuitry for the triggering signals (external).
  • There is no timebase in this counter.
  • This instrument may be able to count pulses to somewhere between 1 and 10 MHz.
  • There are no markings for line voltage or manufacturer.
  • With tubes missing it will certainly not work.
  • With tubes replaced it may well work although the condition of the existing tubes is unknown.