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Pre Amp Valve Identification


Pow_22
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Anyone help identify this valve i found in a box in out loft (not my uncles loft!). From what i can tell on Google its a blackburn coded mullard? Its a Cv491 with the codes 'Gf2' and 'B4F4' on the bottom. I have no means of testing other than whacking it in one of the Hartkes and seeing if it works.

Can post pics later if it helps

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