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In Reply to: Heerlen Philips Factory 12ax7 Date Codes posted by vmazzone@fastmail.fm on December 27, 2014 at 13:03:22:
Straight up triangle is Phillips Copenhagen.
That said, this is the first I've seen the codes on the bottom glass from Phillips/Amperex. I've always seen the codes acid etched in the glass in the area of the bottom mica.
IIRC, Siemens and/or Tele codes them as such.
Cheers,
W
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Follow Ups
- Right leaning triangle... Phillips Heerlen... - wheezer 12/28/1410:20:21 12/28/14 (3)
- RE: Right leaning triangle... Phillips Heerlen... - rusiee 08:30:09 12/29/14 (2)
- Ooops... - wheezer 09:32:15 12/30/14 (1)
- RE: Ooops..-mis spelling. - Mechans 17:38:58 05/2/15 (0)