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MH4KSensibly equivalent¶ to:See also:
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This Marconi/Osram MH4 (MH4K) valve was a manufactured as a Catkin. The Catkin construction was derived from the large Cooled Anode Transmitting valves, and these also featured a shaped copper anode sealed to a glass envelope.The date of the catkin design was 1933 and was clearly made for use in all-mains radio receivers.The design was also with a conventional glass balloon envelope also with the designation MH4.The thin metal tube envelope 25 mm in diameter and, excluding the B5 base pins, is 95 mm tall.References: Data-sheet, 1005, 1043, 3002 & 1040. Type MH4K was first introduced in 1933. See also 1933 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | a | g1 | h | h | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm |
| 4.0 | 1.0 | 250 | -4 | 5.0 | 11,100 | 3.6 |
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Updated February 07, 2013.
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