Virtual Valve Museum

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STC CV485 Heil tube

Size 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.

CV485 V246A/1K label
Pin Function
1 Grid
2 Cathode
3 Heater
4 Heater
5 Anode
6 Resonator
7 Screen grid

The copper disk connects internally to pin 6

CV485 / V246A/2K
Above: V246A/2K / CV485; below: V246A/1K / CV485
Top quarter Bottom quarter