(!) (#1 BEST 01A PAIR) 01A NOS USA NOS 1930's (4.1ma and 4.0ma) matched on Amplitrex
(!) (#1B 01A - BEST PAIR) 01A RCA engraved base NOS 1930's (3.3m and 3.3ma) matched on Amplitrex
(!) M-201A Macy balloon 1929 used/strong (2.7ma)
(!) UX201-A RCA balloon used/good, brass pins 1920's (2.0ma)
(!) X-201-A Bond balloon used/tests like new 1920's (3.0ma)
(Display tube) 201A Volutron brass base - does not work - in good condition - 1920's
01A Cunningham used (2.5ma Gm=400)
01A National Union NOS 1940's (3.1ma)
01A PHILCO engraved base used/tests like new 1930's (3.7ma)
01A Sylvania engraved used 1930's (2.5ma Gm=400)
