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| HL23Sensibly equivalent¶ to:See also: | 
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 |  | The HL23 is a low power low impedance low gain, battery triode. The data-sheet describes the HL23 as suitable for a range of application areas within a receiver including AF amplification.The classic envelope is 30 mm in diameter and, excluding the MO base pins, is 67 mm tall.References: Data-sheet, 1040 & 1043. Type HL23 was first introduced in 1938. See also 1938  adverts. | 
 |   Pin Connections
|  | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |  f | nc | a | nc | g1 | m | nc | f | 
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 |   Absolute Maximum Operating Conditions¶
|  | Vh | Ah | Va | Vg | mAa | ra | gm | | 
 | 2.0 | 0.05 | 150 | -2.4 | 1.5 | 27,000 | 1.2 | 
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 Updated January 06, 2022. |  |