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1T4Sensibly equivalent¶ to:See also:
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The 1T4 is a miniature screened pentode for dry battery operation. It was designed for radio reception and is a variable μ RF device.This valve was purchased new in 1963 to build a one valve broadcast receiver. The design was by Gilbert Davey from an excellent book 'Fun With Radio'. High impedance headphones were mandatory and a pair of Brown type F were available. Many hours of clandestine Radio Luxemburg were enjoyed under the bed clothes until the Ever Ready 90 Volt HT battery died. A cheap Far Eastern transistor radio was then cheaper than a new HT battery.The thin glass tube envelope is 19 mm in diameter and, excluding the B7G base pins, is 46 mm tall.References: Data-sheet & 1040 Type 1T4 was first introduced in 1940. See also 1940 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | f- | a | g2 | ic | f- | g1 | f+ |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 1.4 | 0.05 | 90 | 67.5 | 0 | 3.5 | 1.5 | 0.5M | 0.9 |
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Updated March 12, 2022.
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