(!!!!!) (Best Pair 1961) 12AX7=ECC83 Philips Miniwatt Holland large getter halo "O" low hours/like new 1961 (1.0/1.0ma and 1.1/1.1ma) 1-2% matched
(!!!!!) (Best Single - mic grade) JG-6072A GE NOS black plates triple mica "O" getter halo 1962-1963 (3.2ma/3.4ma) 1-2% section balance (Same Gm) (5-Star sound)
