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(!!!!) (Best Overall Pair) 01A Cunningham NOS 1940 era boxes were factory sealed (3.7ma and 3.6ma) (Same Gm)

(!!!!) (Best Overall Pair) 01A Cunningham NOS 1940 era boxes were factory sealed (3.7ma and 3.6ma) (Same Gm)

$ 109.99
(!!!!) (Best Pair #1) 01A RCA Cunningham engraved base NOS 1930's (3.5ma and 3.4ma) (same Gm)

(!!!!) (Best Pair #1) 01A RCA Cunningham engraved base NOS 1930's (3.5ma and 3.4ma) (same Gm)

$ 109.99
(!!!!) (Best Pair #2) 01A RCA Cunningham engraved base NOS 1930's (3.3ma and 3.2ma) (same Gm)

(!!!!) (Best Pair #2) 01A RCA Cunningham engraved base NOS 1930's (3.3ma and 3.2ma) (same Gm)

$ 99.99
(!!!!) (Best Pair) 201A Silvertone Balloon NOS and like new 1930 era (4.2ma and 5.0ma) (Highest mA and Gm)

(!!!!) (Best Pair) 201A Silvertone Balloon NOS and like new 1930 era (4.2ma and 5.0ma) (Highest mA and Gm)

$ 99.99
(!!!!) (Best Pair) CX-301-A Cunningham used/good 1928-1930 era (2.6ma and 2.5ma) (same Gm)

(!!!!) (Best Pair) CX-301-A Cunningham used/good 1928-1930 era (2.6ma and 2.5ma) (same Gm)

$ 69.99
(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)

(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)

$ 119.99
(!!!!) (BEST SINGLE) 201-A Silvertone Balloon NOS 1930 era (3.8ma and Gm=750)

(!!!!) (BEST SINGLE) 201-A Silvertone Balloon NOS 1930 era (3.8ma and Gm=750)

$ 57.99
(!!!!) (BEST SINGLE) UX-201-A RCA Radiotron Balloon NOS 1930 era (3.9ma and Gm=700)

(!!!!) (BEST SINGLE) UX-201-A RCA Radiotron Balloon NOS 1930 era (3.9ma and Gm=700)

$ 69.99
(!!!!) (Good Value Pair) CX-301-A Cunningham used/good 1930 era (2.0ma and 2.0ma)

(!!!!) (Good Value Pair) CX-301-A Cunningham used/good 1930 era (2.0ma and 2.0ma)

$ 59.99
(!!!!) (Pair) 01A Arcturus NOS 1940's (2.3ma and 2.7ma)

(!!!!) (Pair) 01A Arcturus NOS 1940's (2.3ma and 2.7ma)

$ 88.88
(!!!) (BEST VALUE PAIR) 01A Sylvania engraved base used/good 1930's (2.4ma and 2.7ma) (same Gm)

(!!!) (BEST VALUE PAIR) 01A Sylvania engraved base used/good 1930's (2.4ma and 2.7ma) (same Gm)

$ 59.99
(!!!) (Pair) CX-301A Cunningham Balloon used/good 1930-1935 (2.2ma and 2.5ma)

(!!!) (Pair) CX-301A Cunningham Balloon used/good 1930-1935 (2.2ma and 2.5ma)

$ 59.99
(!!!) (PAIR) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.3ma and Gm=700 x 2 tubes)

(!!!) (PAIR) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.3ma and Gm=700 x 2 tubes)

$ 69.99
(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)

(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)

$ 19.99
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)

(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)

$ 54.99
(!!) (Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1926 (2.5ma) (good Gm)

(!!) (Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1926 (2.5ma) (good Gm)

$ 59.99
(!!) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.6ma and Gm=700)

(!!) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.6ma and Gm=700)

$ 31.99
(!) 201A Aristocrat NOS 1930's (2.7ma and Gm=900)

(!) 201A Aristocrat NOS 1930's (2.7ma and Gm=900)

$ 39.99
(Display tube) UV-201 Volutron brass base - does not work - in good condition - 1920's

(Display tube) UV-201 Volutron brass base - does not work - in good condition - 1920's

$ 15.99
(DISPLAY TUBE) UV-201-A Radiotron

(DISPLAY TUBE) UV-201-A Radiotron "brass base and tipped" 1920's lights up nicely but no emission (display tube)

$ 29.99
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