The Pen40DD is a double diode and audio output pentode. For low cost local station receivers the diodes would produce the AGC and demodulated signal. For a strong local station the demodulated audio would be able to drive the output pentode directly, thus saving one valve.References: Data-sheet, 1040 & 1043. Type Pen40DD was first introduced in 1939. See also 1939 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc |  a(d2) | k | a(d1) | h | h | a | g2 | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | rk | rl | Pout | D | 
| 44.0 | 0.2 | 200 | 200 | -8.8 | 45.0 | 6.0 | 35,000 | 8.0 | 170 | 4,500 | 4.0W | 10% |
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Updated October 06, 2020.
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