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HL133DDSensibly equivalent¶ to:CV2999See also:
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The HL133DD or HL133/DD is an indirectly heated double diode triode designed for use with series heater chains for AC, DC and car radio applications. In a superhet receiver the diodes would be used for signal detection and AGC voltage generation whilst the triode would be the first audio voltage amplifier stage.![](../pics/abi0012a.jpg)
The reverse is plain zinc paint metallisation.The classic envelope is 32 mm in diameter, and excluding the MO base pins is 89 mm tall.References: Data-sheet & 1043. Type HL133DD was first introduced in 1938. See also 1938 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | tc | ![](../static/key.gif) h | k | a | nc | a(d2) | m | a(d1) | h | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | ![](../static/pdflogo.gif)
| 13.0 | 0.2 | 200 | -3.3 | 6.0 | 12,500 | 3.4 |
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Updated January 08, 2022.
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