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PT4DSensibly equivalent¶ to:AC2/Pen/DD DDPP4B DN41See also:
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The PT4D is a directly heated double diode output pentode. The PT4 was originally designed for when a directly heated valve was required and had slightly less output than the MPT4.The cathode resistor is given as 150 Ω and the anode load is 6,500 Ω.Thanks to Bob Hopkins for sending the image.The classic envelope is mm in diameter and, excluding the B7 base pins, is mm tall.References: Data-sheet & 1043. Type PT4D was first introduced in 1934. See also 1934 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc |  a(d2) | a | a(d1) | h | h | k | g2 | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 4.0 | 2.0 | 250 | 250 | -6 | 32 | 7.0 | - | 7.0 |
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Updated August 29, 2018.
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