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Cold cathode tubes ZnnnA e.g. Z803U

1st Letter Z
1st figure Type of base - same code as Mullard receiving valve code
2nd and 3rd figures Serial number
2nd letter A Amplifier tube (continuous operation)
B Binary counter or switching tube
C Multistage counter
E Electrometer trigger or amplifier tube
G Gating tube
M Indicator (metering) tube
S Multistage switching tube
T 3-electrode trigger tube
U 4-electrode trigger tube
W 5-electrode trigger tube

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