The TH2321 is a triode heptode frequency changer for 200 mA series heater chains. The TH233 is the same basic design but with lower internal capacitancies and the newer MO base.![](../pics/abo0082a.jpg)
The reverse is plain zinc paint with the two code letters EW.The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 103 mm tall.References: Data-sheet, 1040 & 1043. Type TH2321 was first introduced in 1938. See also 1938 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | ![](../static/key.gif) a(t) | g1(t),g3 | g2,g4 | h | h | m.k | a | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 23 | 0.2 | 150 | 100 | -3.0 | 3.0 | 6.0 | 1M | 0.65 |
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Updated November 27, 2014.
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