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W30Sensibly equivalent¶ to:See also:
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The W30 is a series two catkin from 1934 and is a 300 mA version of the VMP4. The internal envelope shape is similar to the N30 but the W30 has a substantial outer screening can rigidly attached.The valve is a variable μ pentode and was used for broadcast radio reception. The 300 mA heater specification was introduced for series heater chains and, therefore, transformerless designs for 'Universal' AC/DC mains sets.W31 is pin compatible but has a slightly lower specification.The Osram Catkin label.The wide metal tube envelope is 38 mm in diameter and, excluding the B7 base pins, is 114 mm tall.References: Data-sheet & 1040 Type W30 was first introduced in 1934. See also 1934 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | m | g1 | g3 | h | h | k | g2 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 13.0 | 0.3 | 250 | 250 | -1 | 12 | 6 | 1M | 4 |
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Updated December17, 2011.
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