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CV5261Sensibly equivalent¶ to:
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The CV5261 (commercially the 20L1) design is from the early days of all glass construction in the UK i.e. 1947-49.This is a low impedance amplifier double triode and could have found uses in a wide variety of equipment. The 12.6 Volt heater requirement makes this particularly suitable for vehicle use, likewise the 200 mA current rating makes it suitable for television use.
The triode anode is a small box with side flanges for extra radiating area. The grid wire looks to be gold plated.The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 53 mm tall.References: Data-sheet & 1040. Type CV5261 was first introduced in 1950. See also 1950 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  h | a(2) | g1(2) | k(2) | a(1) | g1(1) | k(1) | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | 
| 12.6 | 0.2 | 250 | -11.5 | 10.0 | 6,200 | 2.8 |
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Updated October 30, 2025.
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