The AC/OC4 is an octode frequency changer or mixer. It has a 4.0 Volt AC heater. The oscillator anode would be operated at 90 Volts. The Mullard FC4 is very similar in rating.
The reverse is plain zinc paint with a reference code near the base.The classic envelope is 46 mm in diameter, and excluding the B7 base pins is 113 mm tall.Reference: 1043. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc |  g2 | g1 | g3,g5 | h | h | m,k | a | g4 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | gm |
| 4.0 | 0.65 | 250 | 70 | -1.5 | - | - | 0.7 |
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Updated March 19, 2014.
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