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RE: what tube(s)

Ah....you got short plates since all are after 1960 .

CV4004 were a separate production run and made IIRC up to the end of the Mullard factories c. 1985. They have a warmer balance and among the best of the Mullards in midrange and bass.

Long plates were built from 1954 to 1959. The plate structure is 17 mm long.
1954 to 1957 marks the first series mC1 (acid etched code on glass)
1957 to 1958 is the f91, my personal favorite
1958 to 1959 is the f92

from 1960 on, Mullard 12AX7's are short plates, 15 mm long and the acid etched codes start off I61, I63, etc....

You got the later short plate series which are still nice tubes and the prices if tubes are checked good, are reasonable, IMHO.


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  • RE: what tube(s) - unclestu 16:59:39 10/15/14 (1)

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