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ID = 28591
Great Britain (UK)
Brand: Burndept Ltd. London
Tube type:  Triode, vacuum   Universal 
Identical to HL512
First year 1925 Saga of the Vacuumtube, Tyne page 392
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.47

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.12 Ampere / Direct / Battery =
Literature The Wireless World, London (WW, 79)   Advertisement Jan 6 1926;
HL512: R.O.
Rudolf Osterkamp

HL512: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Documents about this component
  Article in Wireless World 30-9-1925 1879 KB

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