Antique radios, Old Time Radios
A537
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Country:
Great Britain (UK)
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Brand:
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MO Valve Co. Ltd.; GB |
| Tube type: |
Triode, vacuum Audio Frequency |
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Ca. 1925 up to 1945 very rare. *** |
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| Identical to |
A537
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| Similar
Tubes |
Normally replaceable-slightly different:
A1178
|
| Base |
SPECIAL TUBEBASE in general
Side contacts.
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| Filament |
Vf 4 Volts / If 0.4 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Special for microphone amplifiers. Gm=1.55mA/V. Amp Factor=15.5, Z=10k, Va<150, Ia=3.3mA at Vg=-6. (Price 3.8EUR in 1938)
Replaced by the A1178.
The valve is not fitted with the usual four-pin base; instead, the base carries four contacts which press against tongues in the special-holder Ct4. Some saving in space is thus obtained, and this is accentuated by the small dimensions of the glass bulb.
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Dimensions (WHD)
incl. pins / tip |
29 x 77 x mm / 1.14 x 3.03 x inch |
| Information source |
Taschenbuch zum Röhren-Codex 1948/49
- - Manufacturers Literature
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A537: Wireless World, 6. April 1934 / Keith R. Thrower
Stefan Müller
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A537: MARCONI RECEIVIN VALVES, LONDON, 1938
Jose Casas-Avalos
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Collection of
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