I think this is a Valvo 12AT7, coded D9C, you can see the D in the first pic.
Just curious, but would it be a '59 or '69 date of mfg? My guess is '69, if only because '60s tubes are more common than '50s.
'59 or '69 Valvo 12AT7
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David Root
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'59 or '69 Valvo 12AT7
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