(!!!) (Best Pair) 81 ST-19 RCA NOS original boxes 1940's (1 pair)
(!!) (#1 81 Balloon) 81 Arcturus Balloon used/tests like new engraved base 1930's like new condition (53/40)
(!) (#1 81 ST-19 glass shape) 81 ST-19 Purotron made by RCA "engraved base" NOS in Sparton box 1940's (56/40) (strong output)
(DISPLAY TUBE) TS-281 Tungsol Balloon NOS engraved base 1930's (for display purposes only)
81 ST-16 Sylvania NOS 1940's top mica tilted, 1 small glass chip inside tube (56/40)
81 ST-19 Harvey Burnam by RCA NOS engraved base 1940's (54/40)
81 ST-19 RCA Radiotron engraved base 1939, tests like new, loose glue particles inside base (good value) (53/40)
81 ST-19 RCA/Radiotron NOS RED PRINTING in original box (54/40)
