(!!!!) (2nd Best Amperex PQ Single) 6922 Amperex PQ USA NOS 1962 (14.5/16.2ma) (Audio Research, Nova)
(!!!!) (Best Amperex PQ Single) 6922 Amperex PQ USA NOS 1962 (19.0/18.2ma) (Audio Research, Nova)
(!!!) (Best Single) 6922 Amperex PQ USA 1967 NOS (13.6ma/16.8ma)
(!!!) (Single) 6688=E180F Amperex PQ USA NOS "O" getter 1968 (9ma)
(slightly microphonic) 6922 Amperex PQ Holland 1962 low hours/like new (11.2/11.6ma)
7788=E810F Amperex PQ USA NOS 1969-1970 (33ma)
JAN-7788 Amperex USA NOS 1986 (54ma)
