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List of known Marconi / Osram A-number (special purpose) valves

A166P610
A298U14
A334Selected PX4
A373HF voltmeter diode
A491Selected MSP4 5-pin met.
A537Triode for microphone amps
A552N41 pentode
A577Valve voltmeter
A580Low impedance triode
A638Double P2
A726As MH40 but 13v heater
A748Double D42 for GEC TV diode use
A792H30 to special tests for EMI
A800(CV412)
A802MHL4 with copper clad getter
A819Selected KTZ41 (CV1698)
A831Battery charger
A855Like KT66 but with anode top cap, 4v 2a
A864Output tetrode for EMI 13v 0.6a
A883Like D42 but with anode top cap
A9015.2v 1.5a IHC output tetrode (CV1722)
A915(CV1462)
A915 metallised(CV2803)
A915A metallised(CV2804)
A922IHC diode for TV
A924Double L21 (CV2805)
A943KTZ63 tetrode with cathode connection brought out
A95013v 0.45a version of KTZ41 for EMI
A964P410 photocell relays
A980H30 with extra high h/c insulation for EMI
A1065(CV1343)
A1834(CV2523)
A1835(CV2523)
A2087CL(CV8733)
A2196(CV3920)
A2223(CV10706)
A2744(CV4105)
A2975(CV10813)

Compiled from "The Saga of Marconi Osram Valve", the CV Register, other references and valves in my own collection. Please do not copy without reference!

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