5642

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Apollo 5642 tube

The 5642 is a directly-heated high-voltage rectifier tube. It has three flexible lead connections and is intended to be soldered into the circuit.

It is used in the CRT cathode and post-deflection acceleration supplies in many Tektronix scopes. In typical CRT circuits, the filament/cathode leads of each 5642 have their own secondary winding on the HV transformer.

Specifications

Heater 1.25 V, 200 mA
Peak inverse volrage 10 kV
Peak plate current 250 μA

Data Sheets

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