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Original Message
Svetlana 6550 I.D.
Posted by Story on January 15, 2021 at 16:08:09:
my understanding was the winged C was always printed on the tube AND box until New Sensor took over. I never had Svetlana 6550's but all my el34's were winged C with bright, thick red lettering because I bought them earlier than 98.
I used a lot of them for Marshall repairs.