Antique radios, Old Time Radios
SPTA
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Country:
Great Britain (UK)
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| Identical to |
SPTA
= SP13C
= 13SPA
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| Similar
Tubes |
Heater different:
SPTS
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| Base |
British-7-Pin, old (M7A)
Top contact with a cap.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 13 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC |
| Description |
Ferranti recommend this as a replacement for the SPTS by adding a Heater shunt of 130 ohms at 1.5W.
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| Information source |
History of the British Radio Valve to 1940 p. 142 & 196
- - Manufacturers Literature
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SPTA: Fin Stewart
Fin Stewart
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Just Qvigstad
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