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(!!!!!) (Best Siemens Pair) 6922=E88CC Siemens Halske Germany branded "ECC88 Industria" gray shield NOS 1965 (16.6/17.0ma and 19.8/16.0ma) (mic, phono preamp)
(!!!!!) (Best Siemens Single 1965) 6922 Siemens Halske Germany NOS branded ECC88 INDUSTRIA (14.4/15.2ma)
(!!!!) (Best Value Single) 6922=E88CC Penta Labs Hungary used/like new 1980 era (13.8/15.8ma)
(!!!!) (Single) 6922=E88CC Penta Labs Hungary used/good 1980 era (10/15ma)
(!!!!) (Single) 6922=E88CC Siemens Halske Germany branded RCA gray shield used 1966 (12/9.2ma)
(!!!) (Recommended Pair) ECC85=6AQ8 RCA Heerlen Holland NOS 1968 (21/16.5ma and 18.5/15.5ma) (close Gm)
(!!) (Good Value) 12AT7=ECC81 Siemens Halske Germany used/strong 1964 (8.2ma/12.2ma)
(!) E88CC=6922 Valvo Holland used/good 1961 (10.2/10.1ma) 1-3% section balance
