Military valves have different markings to commercial valves. Most have a CV number (CV = common valve) It is best explained with an example. I recently sold some E88CC or 6922 with the following markings CV2492 KB/AD ZF. Decoded this means:
CV2492 is saying this is an E88CC or 6922 or any other equivalvent - ie a high class 6DJ8 or ECC88.
K is saying this valve has been made to specification K1001 or K1006 if it had been a J it would have meant it was made to a JAN or MIL spec.
B is saying the qualification approval was given by a UK authority, if it had been a U it would be US or a D for Australia or an X for DERAD Air approval.
AD is the factory identification code in this case Brimar rochester plant.
Orignal From: Decipher Codes on Tubes Valves Mullard Brimar Military
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