Radios antiguas y Radios de Colección
ECH21_9pin
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País:
Holanda
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| Idéntica a |
ECH21_9pin
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| Válvulas similares |
Other base and data slightly different:
ECH21
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| Válvulas Predecesoras |
ECH3
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Válvulas Sucesoras
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1941
ECH21
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| Base |
Loctal-9-Pin (B9G)
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| Filamento |
Vf 6.3 Volt / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC |
| Descripción |
The Philips 21- "Key Base" tubes were initially designed in 1940 with the 9-pin base B9G like the EF50. The later series production however was changed in 1942 to the 8-pin Locktal-base B8G designed by Sylvania.
Note the small heater current by 0.2 A compared to the later ECH21 with circa 0,34 A.
Texto en otros idiomas
puede diferir
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| Literatura |
- - Manufacturers Literature
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ECH21_9pin: original Philips documents
Jacob Roschy
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Just Qvigstad
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ECH21_9pin: original Philips documents
Jacob Roschy
Mas ...
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