Virtual Valve Museum

Virtual Valve Museum

HomeFull List

This is an archive website. It will not receive any updates, additions or corrections.

CV2479 noise tube

This valve measures 166x15mm overall

This is a gas filled, low current noise tube.

Heater voltage6.3V
Heater current1.0A
Max striking voltage (in mount)1150V
Normal voltage drop across valve *50V
Preferred operating current35mA
Min operating current25mA
Max operating current50mA
Min series resistance1500 ohms
Nominal noise power available **15.25dB
Nominal noise power output change *** with current0.03dB/mA
Useful frequency range9GHz to 18GHz

*: The value quoted is that which is obtained with Ia = 35mA. It is essential that the energy available for striking the tube exceeds the minimum value of 2 x 10-3 joules.

**: Given as a reference to thermal noise at 17°C.

***: The EVS sheet says 'charge' here but change sounds more likely.

The heater/cathode connection is indicated by a white spot.