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(!!!!) (Best Balloon) MX-280 Marvin Custom Built used/strong 1920's (60/40 and 65/40) (rare)
(!!!!) UX-280 RCA Radiotron Balloon used/60% 1930 era some white oxide flakes inside tube (38/40 and 38/40)
(!!!) CX-380 Cunningham Balloon used/good 1930 era (46/40 and 56/40)
(!!) (DISPLAY TUBE) 180 Arcturus Blue 1930 era (does not work - display tube only)
(DISPLAY TUBE) 480 Deforest Audio Balloon shape glass 1930's (for display purposes only - does not work)
(DISPLAY TUBES) 80 Balloon shape glass 1930's (for display purposes only - do not work)
