Antique radios, Old Time Radios
5B/257M
| Base |
Loctal-8, B8G (Sylvania, 1938)
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| Filament |
Vf 12 Volts / If 0.47 Ampere / Indirect / Specified voltage AC/DC |
| Description |
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.
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| Information source |
-- Original-techn. papers. Ministry of Supply Documentation
- - Manufacturers Literature STC Handbook Jan 1963
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5B/257M: Brimar Radio Valves and Teletube Manual No.7
Adrian Riesen
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Just Qvigstad
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5B/257M: Brimar Radio Valves and Teletube Manual No.7
Adrian Riesen
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Collection of
Collection of a member from FIN
| Documents about this component |
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