Valve CV428 ITT 5B/254M

Product Code: VCV428

This product was discontinued on .
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ITT 5B/254M beam tetrode (CV428).

  • 5B/254M
  • CV428 MILITARY GRADE
  • ITT /STC, ENGLAND
  • ORIGINAL BOX
  • NEW AND UNUSED


Made in England

New in original box

The valve measures 103x30mm overall and has a loctal base. The anode connection is the top cap.

Heater voltage 6.3V
Heater current 900mA
Max anode voltage 600V
Max anode voltage (Ia=0) 750V
Max screen voltage 300V
Max anode current 120mA
Max anode dissipation 25W
Max screen dissipation 3W
Mutual conductance * 6mA/V
Inner amplification factor * 9
Max DC grid voltage -200V
Max RF voltage between g1 and g2 1000V
Max frequency for above ratings 60MHz
Capacitances
Cag 0.1pF
Cge 13pF
Cae 7pF

"I wouldn't hesitate. The examples I have seen were all made by STC Footscray (London), and are absolutely best quality. Low price is on account of funny base and topcap.

Run the screens from their own supply of 300V. As the spec says, you can run 600V on the anodes, which will give 80W PP pentode mode AB2.

Low screen rating means triode mode is relatively poor, but who cares, just use pentode mode with a Schade network and away you go.

These are much tougher the the old kind of 6P3S, much less risk of gassy samples too"