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I´ve got some old RCA tubes which might be from the 50ies. One is a steel 6V6 tube, the other is a little bit a miracle to me as I do not find too much information on the old RCA tube data sheets: a RCA 6F6 G. Has anybody an idea where this tube could be used ?

The 6F6 is an octal pentode with Zout=7K in SE use. According to Duncan's TDSL it's similar to a 6V6, but not the same.