The St. Petersburg are the ones you want/have.
Congratulations getting these excellent tubes with your purchase. Especially if they test as new.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
24.76.171.131
This Post Has Been Edited by the Author
In Reply to: RE: Svetlana 6550 Identificiation posted by AJ on January 15, 2021 at 10:40:37
"Square" holes are the tell-tale sign for 6550 tubes made in St. Petersburg. The tube logo was changed as you say to Winged "C". Then manufacturing stopped in 2011.
The St. Petersburg are the ones you want/have.
Congratulations getting these excellent tubes with your purchase. Especially if they test as new.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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