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I am trying to figure out what 12AU7 I have here. Code reads 72 and GF48 and labelled India. What factory is 72?
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I found a bunch of their 12AX7s in an ARC SP6 I had. They are BEL not BELL yes from the Barat factory and yes again, they are more than just decent imho, pretty darned good all round. I don't know what their relationship is/was with Philips.
Steve
BELL got Mullard tooling (early 70's?) and made tubes but I don't know if what you have is one of those. I have two quads of BELL EL84's a nice sounding tube looks just like a Mullard.
Check out the various websites with philips factory codes.I dimly recall the India made 12XX series, but were relatively uncommon in the west. IIRC, top eetched line was tube type, second line was the factory and date code. I'm sitting a relatively full box of 12AX7's labeled India but the etched codes mark it as Yugoslavian. EAsy to date because the postage is on the packing (early 60's, way pre war, when Yugos were very well made).
IIRC true India tubes were favored by many ARC preamp users (SP-3/6) in the day. The Philips Barat factory code was V, BTW Those old Indias supposed had a very respectible midrange
Edits: 02/25/15
I have checked for tube code info but am unable to decipher this. Strange that the tube type is GF48 and not just GF4. Also 7 is a factory code for Fleetwood Mullard but not 72.
Sorry not Fleetwood which would be the G in the bottom code. 7 is either Philips Eindoven or Hitachi Japan?
Forgot the pic.
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