5642
The 5642 (European: DY70 (similar)) (P/N 154-0051-00, 154-0079-00) is a directly-heated high-voltage rectifier vacuum tube. It has three flexible lead connections and is intended to be soldered into the circuit.
![](http://w140.com/tekwiki/images/thumb/3/3a/Apollo_5642_tube.jpg/300px-Apollo_5642_tube.jpg)
The European type DY70 is very similar (with lower heater current, 140 mA).
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, typically a single loop of wire with extra silicone tube insulation.
Key Specifications
Heater | 1.25 V, 200 mA |
---|---|
Peak inverse voltage | 10 kV |
Peak plate current | 250 μA |
Links
- RCA 5642 datasheet (PDF)
- 5642 / DY70 @ radiomuseum.org