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PM2ASensibly equivalent¶ to:See also:
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The PM stands for Philips-Mullard and were introduced in 1925. The PM2A is a later addition to the original range from 1929. The series all had oxide coated filaments.These audio valves could drive a small loudspeaker. The PM2A had an output rating of 0.15 Watt at 5% distortion.The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 85 mm tall.References: 1931 datasheet & 1043. Type PM2A was first introduced in 1930. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | 
| 2.0 | 0.2 | 135 | -6 | 5.0 | 6,000 | 2.0 |
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Thanks to Andy Cowley for supplying the above PDF datasheet. |
Updated May 20, 2018. shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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