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1A3Sensibly equivalent¶ to:
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The 1A3 is a signal diode and features a 1.4 Volt indirectly heated cathode. Normally dry battery valves are directly heated. Such a valve would find applications where the cathode is not taken to ground or where the filaments of other valves are run in series from a higher voltage supply. Two such valves could be used in a discriminator in an FM radio in the 1950s.The heater wire is a single thread running vertically through the anode cavity.
Seen from the side the anode can be seen as two fins with a central cylindrical cavity for the cathode.The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 45 mm tall.References: Datasheet, DA90 & 3002 Type 1A3 was first introduced in 1943. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |  h | a | k | - | - | a | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa | 
| 1.4 | 0.15 | 117 | 0.5 |
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Updated August 01, 2019. shape:thin.glass.tube construction:all.glass type:diode age:1940.1950 base:b7g heater:1.4v pins:7 pin:1.h pin:2.a pin:3.k pin:4.- pin:5.- pin:6.a pin:7.h
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