Virtual Valve Museum

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CV128 halfwave rectifier

Size The valve measures 185x60mm overall and has a 4 pin base.

The prototype is SU750.

Heater voltage 10V
Heater current 2.4A
Max applied input voltage RMS 3000V
Max working PIV 7500V
Max no-load PIV 9000V
Max DC output current 250mA
Max peak anode current 2A
Max reservoir capacitor 4µF
Min limiting resistance 500 ohms
Min delay time before HT applied 20 seconds


Pin Function
1 n/c
2 Heater and cathode
3 n/c
4 Heater
TC Anode
Inside view Heaters
The valve has three separate cathodes within the single anode structure.
Top quarter view