12SA7 RCA used/good 1945 era (3.1ma Gm=900)
12SA7GT Hytron tests like new 1946 (3.6ma Gm=1000)
12SA7GT Mullard Holland used/good 1960 (3.8ma)
12SA7GT Nat. Union used/good 1950 era (2.8ma Gm=800)
12SA7GT Raytheon used/good (2 in stock)