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ID = 19574
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Beam Power Tube   beam power   Power/Output 
Identical to 5B/255M = CV391
Similar Tubes
Heater different:
Different connections:
  5B/254G ; 5B/254M
Multiple differences or of other kind:
  5B/258M ; CV2347
Predecessor Tubes 5B/250A  

Base Loctal-8, B8G (Sylvania, 1938)
Was used by Transmittertube (Radio)
Filament Vf 6.3 Volts / If 0.9 Ampere / Indirect / Parallel, (AC/DC)

This is one of a range of reliable beam power tubes from STC. The 5B/254G, 5B/254M (CV428), 5B/255M (CV391), 5B/256M (CV499), 5B/257M (CV2220), 5B/258M (CV2347), were developed from the 5B/250A (807)with similar characteristics to the 807. The range comprises single and double-ended and wire terminated versions and were widely used in military and civilian equipments for both audio and radio frequency applications up to 125 MHz.
Total anode and screen dissipation <25W.
Power outputs from a pair at 60 MHz class C can achieve 40W with anode voltages of 600. At audio frequencies a pair in class AB2 can achieve 80W rms.

Dimensions (WHD)
incl. pins / tip
x 93 x 30 mm / x 3.66 x 1.18 inch
Tube prices 1 Tube prices (visible for members only)
Information source -- Original-techn. papers.   
5B/255M: My tubes
Anonymous 413 Collector

5B/255M: STC Manufacturers data
Patrice Zeissloff

5B/255M: Brimar Radio Valves and Teletube Manual No.7
Anonymous 1038 Collector

from Just Qvigstad

Documents about this component
  Manufacturer's Data Sheets 563 KB

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