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4-THASensibly equivalent¶ to:
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The 4-THA is a triode hexode frequency changer designed for AC sets that were fitted with mains transformers, for AC/DC (universal) sets the functionally identical 203THA with a 200 mA heater was also issued.The triode is employed as the local oscillator and the hexode for the mixing process, the input signal being coupled to the control grid via the top cap for maximum separation of the circuits.The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 117 mm tall.References: 1043. Type 4-THA was first introduced in 1938. See also 1938 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | 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 | gm |
| 4.0 | 1.5 | 250 | 100 | -2 | 3.5 | 5.5 | 0.85 |
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Absolute Maximum Operating Conditions¶
| Va | mAa |
| 100 | 1.5 |
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Updated January 07, 2013.
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