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MSP4 / ARP33 HF pentode

Size This valve measures 121x45mm overall and has a B7 base.


Heater voltage 4V
Heater current 1A
Max anode voltage 250V
Max screen voltage 100V
Mutual conductance (At Va=200, Vg2=100, Vg1=0, Vg3=0) 5.5mA/V
Cae 8.25pF
Cge 12.75pF


Pin Function
1 Metallising *
2 Control grid
3 Suppressor grid
4 Heater
5 Heater
6 Cathode
7 Screen grid
TC Anode

*: This data is taken from the equivalent CV data (CV1282) which shows pin 1 as connecting to the metallising. This non-CV example does not have a metallic outer coating.


Above: MSP4; below: ARP33


ARP33 label

Label shows ARP33 and ZOKJ

This file was last modified 15:45:15, Tuesday September 02, 2014