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(!!) (Best Single) UX-120=20 Radiotron used/tests like new 1920's (7.3ma)
(!!) (Single) UX-120=20 Radiotron used/60% 1920's (4.8ma)
T-20 Taylor Balloon used/like new 1940's
UX-120 Radiotron used/tests 35% (low Gm=100) (display tube)