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RE: Mullard CV4004 or Mullard ECC83?

CV numbers are not limited to the forces , it covered a vast array of government ministries... I mentioned the UKAEA as I once cleared out a decommisioned research station of a lot of it's old valves . Instrumentation was updated but their stores still had retained a lot of old stock valves , all with CV designators . Ditto for the post office (GPO) which is now known as BT (British Telecom) who used a phenomenal quantity of CV140 (EB91) . Initially the navy , air force and army all had their own designators which were amalgamated during WW2 , hence the CV 'common valve' designation . 'A' datecodes started in 1945 . This eventually covered all government sourcing valves post war . Some people believe that valves with CV designators are better or 'mil-spec' which is a very common misconception .

Al


Edits: 10/17/14
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