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1F3Sensibly equivalent¶ to:See also:
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The 1F3 / 1T4 is a miniature screened pentode for dry battery operation. It was designed for radio reception and is a variable μ RF device.
Inside the screen can be seen the bright anode, suppressor grid and single strand filament with the support spring at the top. The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.References: Data-sheet & 1040 Type 1F3 was first introduced in 1948. See also 1948 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 May 23, 2020.
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