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EF85Sensibly equivalent¶ to:
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The EF85 is described as a VHF varible-mu pentode. Clearly this places the valve in a superhet context with AGC applied to the RF and IF sections. It was a television valve and the frame grid EF183, released in 1962, overtook its performance.The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 60 mm tall.References: Data-sheet & 1040. Type EF85 was first introduced in 1951. See also 1951 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | k | g1 | k | h | h | s | a | g2 | g3 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 6.3 | 0.3 | 250 | 100 | -2.0 | 10.0 | 2.5 | 0.5M | 6.0 |
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Updated February 23, 2013.
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