 |
| Identical to |
ECH21_9pin
|
| Similar
Tubes |
ECH21 (other base and data slightly different)
|
| Predecessor Tubes |
ECH3
|
| Successor Tubes |
1941
ECH21
|
|
| Base |
Loctal-9-Pin (B9G)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
-: Indirect /
-: Parallel / series AC/DC /
If: 0.2 Ampere /
Vf 6.3 Volts /
|
| Description |
The Philips 21- "Key Base" tubes were initially designed with the 9-pin base B9G like the EF50. The later series production however was changed 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.
Text in other
languages (may
differ)
|
| Literature |
- - Manufacturers Literature
|
|
|
|
|
|
original Philips documents
Jacob Roschy
|
|
original Philips documents
Jacob Roschy
|
|
original Philips documents
Jacob Roschy
|
|
|
