{Collins} Fetrons

Has anyone ever seen Fetrons in the S Line equipment instead of Tubes?They were Available in the 1970's
to replace many Vacuum Tubes. They were Just Plug in.
I would like to find a Fetron for the 6AU6 or 75433 for my
75S3B and see if the PTO settles down
and save me the Trouble of rebuilding the PTO.
Stan K6RMR

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