(!!!!!) (Best GE Pair #1) 6BX7GT GE branded RCA low hours and Westinghouse NOS 1960 same build (63/73ma and 66.5/69.6ma)
(!!!!!) (Recommended Pair) 12BH7A GE gray oval plates "O" getter 1963 (12/12.5ma and 12/14ma)
(!!!!) (Best Mullard Single) 12AU7 Mullard branded Sonotone ribbed plates NOS 1960 (10.2/10.8ma) (DAC, linestage) (Mitcham plant)
