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ONE PAIR NOS NIB RCA 17DM4A VACUUM TUBE. 

THIS TUBE IS THE EXACT SAME TUBE AS THE 17AX4GTA.

SEE THE PICTURE OF THE SYLVANIA TUBE (WHICH IS NOT FOR SALE 

BUT PROVIDED AS EVIDENCE OF EQUIVELENC OF THE TWO NOMENCLATURES)

FRANKS DATA SHEET COLLECTION ALSO  LINKS THE DATATSHEETS FOR BOTH TUBES.