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7HG8Sensibly equivalent¶ to:
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The 7HG8 is a triode pentode VHF TV frequency changer and was made in the UK. The triode is the oscillator and the pentode is the mixer. The pentode is of frame-grid construction.This triode pentode was made in a number of different heater configurations: 4HG8 - 4.5 V @ 0.6A, 5HG8 - 5.3 V @ 0.45 A, 6HG8 - 6.3 V @ 0.34 A (same as ECF86), 7HG8 - 7.2 V @ 0.3 A (same as PCF86) and 8HG8 - 8.0 V @ 0.3 A.Other data sources give the 7HG8 a heater rating of 8 Volts at 300 mA the same as the PCF86.The triode has holes in the ends of the anode and the grid can be seen. The anode of the pentode obscures the internal electrodes.The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.References: Data-sheet, 3002 & 1040. Type 7HG8 was first introduced in 1960. See also 1960 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | k,g3,s | g1 | k,g3,s | h | h | g1(t) | a(t) | a | g2 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 8.0 | 0.3 | 190 | 140 | -1.5 | 8.5 | 2.7 | 0.35M | 4.5 |
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Absolute Maximum Operating Conditions¶
| Va | mAa |
| 120 | 6.0 |
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Updated January 29, 2013.
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