SYLVANIA. USA 6U7G (CV706) (6U7) Used Valve Tube Tested (B825) £11.00 - PicClick UK
6U7G VACUUM TUBE NOS TESTED (B11) | eBay
6U7G | TubeDepot.com
Where can I get a list of vacuum tube prices in 1920-1950? I mean the price of vacuum tubes in that period, not the current prices for historical tubes. - Quora