(!!!!) (Best Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates 1964 (1.3/1.5ma and Gm=1700/1800)

1 low noise tube )ECC83=12AX7 Telefunken Germany <> bottom smooth plates 1964 

1 section) 1.3ma Gm=1700

1 section) 1.5ma Gm=1800

Good NOS Ma = 1.0 - 1.2ma

Good NOS Gm = 1600

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