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I have a pair of 50's British Tungsrams that don't look like these. Are they relabeled RFT or something else?
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Mullard manufacture 1960's vintage .
Al
The whole story behind these tubes are that most labeled as made in the UK, are actually produced by RFT and are merely relabeled, especially the ones shown with white text | logis, whereas the ones done with yellow text | logos are relabeled Mazda French versions.
As most people have a great deal of difficulty in telling the differences between say 12AT7s, made by RFT | Tungsram | Telam|Polam, it then becomes a matter of studying the internal structural differences for slight variations, as some are folded, while others are crimped.
Then ask yourself, if Tungsram ever really made a 12AT7?, as consensus seem to say they didn't.
The truth then resides somewhere in studying their structural differences as shown through multiple relabeled versions here:
http://www.tubemongerlib.com/gallery2/v/12AT7/?g2_page=8
Happy hunting.
This is what mine look like. They have a different getter and instead of saying ecc81 mine have 12at7. Cheers.
mt
Not sure about any codes, thinking about buying them if they're not RFT tubes labeled Tungsram's.
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