STC CV485 Heil tube
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The valve measures 85x19mm overall (42mm across the disk) |
The CV485 is a specially selected CV228.
| Heater voltage | 6.3V |
| Nominal heater current | 0.3A |
| Grid voltage Vg1 | -10V |
| Resonator voltage Vres | 220V |
| Screen voltage Vg2 | 0 to Vres |
| Anode voltage Va | Vres + 10 to Vres + 20 |
| Power output | 0.25W min |
| Cathode current | 40mA max |
| Tuning range | 4580 to 4860MHz min |
| Magnetic field | 1100 gauss min |
Vg2 is adjusted to give the specified cathode current. Operation with Va=Vres may give increased noise output. Jessops magnet type no. 10512 or 9501 is suitable.
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The copper disk connects internally to pin 6
Above: V246A/2K / CV485; below: V246A/1K / CV485
