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if not ... what are they ?
Follow Ups:
Looks like they are Philips/Amperex made. All the Mullards I own have a "port hole" in the plate. Are their any codes marked on them?
"Nothing quite like high voltage DC to sharpen the mind and body!"
Indeed, round hole on the plate for UK made Mullard EL84 and rectanglar hole for others e.g. Amperex Holland.Tim
Hong Kong Tube Audio Club
http://hktubeaudio.homestead.com/
To expand on SG's comment...Look for these printed near the bottom of the tube. Then go to link to find the date and manufacturing site.
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