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HL4Sensibly equivalent¶ to:
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The golden screened HL4 triode was designed for general purpose and audio amplifier applications. It is of medium impedance and could have been employed as the first audio stage after the detector in radio receivers.The classic envelope is 37 mm in diameter and, excluding the B5 base pins, is 87 mm tall.Reference: 1043. Type HL4 was first introduced in 1935. See also 1935 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 |  a | g1 | h | h | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm |
| 4.0 | 1.0 | 200 | -3.0 | 4.0 | 11.5k | 3.5 |
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Updated January 08, 2013.
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