(!!!!) (Recommended Pair) 71A and CX-71A Cunningham Balloon 1930 era used/test like (24.5ma and 28.8ma) (same Gm)
(!!) (Recommended Pair) UX-171A and CX-371A RCA/Cunningham Balloon used/test like new 1930 era same build (24.6ma and 27.2ma) (same Gm)
71A Cunningham Balloon used/tests like new 1930's (30ma)
71A Sylvania used/good 1930's (21ma)
