(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's (2.3ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (2.4ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (2.6ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) 211D=VT-4-B Western Electric nickel base used/60% mid-1920's - reboxed (61.5ma)
(!!!) 231=31 US Made Balloon NOS 1920's (14.2ma)
(!!!) 31 RCA Radiotron Balloon NOS 1920's (13.2ma)
(!!) (Best Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1920's (3.8ma)
(!) (Best Single) UV-201-A Radiotron tests like new 1920's some scrapes on base (3.8ma)
(!) (Display Tube) 101F Western Electric Tennis Ball engraved base 1930 era (no emission/filament lights) (DISPLAY TUBE)
(DISPLAY TUBE) 216A Western Electric used 1920's
(Display tube) UV-201 Volutron brass base - does not work - in good condition - 1920's
(Display tube) UV-201A Radiotron brass base 1920's (does not work)
01A Wards by Sylvania used/good 1940's (2.6ma Gm=700)
101D Western Electric Tennis Ball 1920's test like new (7.8ma and 8.4ma) (sold out)
102F WE Tennis Ball display tube - does not work
CX-220=20 Cunningham NOS 1920's (triode)
Deforest Audion Isolantite base display tube (single)
Deforest Audion metal base display tube 1920's (single)
DV-5 Deforest Isolantite base used/good 1920's (single)
UV-201 RCA Radiotron "brass base" and tipped used/good 1924 (3.5ma)
