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RE: Mullard CV4004 or Mullard ECC83?

'Mullard CV4004 were originally built for Britih military'

I doubt it , this type has the commercial designator of M8137 so was also used commercially . It is a ruggedised 12AX7 and what you suggest is a common misconception around here . Just because it has a CV number , doesn't necessarily mean it was intended for the military . The UKAEA and GPO , for example , were government organisations that used valves designated this way . CV=common valve

Al

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