(!!) (Single) 46 RCA Radiotron / Cunningham Balloon used/good 1930's (46ma Gm=2200)
(Single) 46 RCA NOS original box 1940's (59ma Gm=2900)
46 RCA NOS 1940's (60.4ma Gm=3210)
46=VT-63 Ken Rad used/tests like new 1940's (57.2ma Gm=2660)
