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CV1663Sensibly equivalent¶ to:3A/109B 4021B AR20 POVT87
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The CV1663 (commercially the 3A/109B) is a telephone repeater triode from STC. It features a B4 base cap and replaced the earlier 3A/109A with a UX4 base cap.The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.
The control grid winding and one of the three filament loops. The bright anode is ribbed for mechanical stability.The classic envelope is 44 mm in diameter, and excluding the B4 base pins is 101 mm tall.Reference: Data-sheet. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | 
| 4.0 | 0.25 | 190 |
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Updated June 09, 2025.
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