Antique radios, Old Time Radios
A1178
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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 |
A1178
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| Similar
Tubes |
Normally replaceable-slightly different:
A537
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| Base |
SPECIAL TUBEBASE in general
Side contacts.
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| Filament |
Vf 4 Volts / If 0.25 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Special for microphone amplifiers. Gm=2.8mA/V. Amp Factor=25, Z=9k, Va<150.
Designed as a replacement for the A537
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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| Information source |
- - Manufacturers Literature
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A1178: Wireless World, 6. April 1934 / Keith R. Thrower
Stefan Müller
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