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The 5718  (European: EC71) (P/N 154-0053-00) is a subminiature high-frequency triode tube.

It is used in the front end of the 321 (early models) and in the P500CF and P170CF probes.

Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
P170CF (V951) 157-0019-00 All, Note1
P500CF 157-0046-00 All, Note2
P500CF 157-0070-00 All, Note3
  • Note1:Aged/checked tubes have a green dot painted on tip
  • Note2:Aged/checked tubes have a yellow dot painted on tip
  • Note3:Aged/checked tubes have a white dot painted on tip
  • 157-0046-00 has been replaced by 157-0070-00


Tube aging procedure / Selection and checking procedure