gibosi
Headphoneus Supremus
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It's even more complicated: The NR73 was an Admiralty type originally but ZAs are Army stores numbers! The Admiralty stores number was W1280.
P.S. I'm sure you meant to write D = Mitcham.
Thanks for the correction.
And yes, D = Mitcham
http://www.tubecollector.org/cv-valves.htm