(!!!!) (Best Overall Pair) 27 Philco by Sylvania NOS 1940's (7.0ma and 7.0ma) 1% matched
(!!!!) (Best Pair) 27 Philco by Sylvania NOS 1940's (6.1ma and 6.1ma) 1% matched
(!!!!) (Best Pair) 27 Philco by Sylvania NOS 1940's (6.3ma and 6.3ma) 1% matched
(!!!!) (Recommended Pair) 27 Philco by Sylvania NOS 1940's (5.5ma and 5.5ma)
(!!!) (BEST PAIR) 485 National Radio tube engraved base mesh-plate NOS 1930's (6.0ma and 6.4ma) (variant of 27)
(!!!) (Best Single) 127 Arcturus Blue Balloon tests like new 1930 era in white box (5.6ma) (High Ma and Gm)
(!!!) (Recommended Single) 127 Arcturus Blue Balloon used/good 1930 era in white box (4.3ma)
(!!) (Best Single) 27 Philco by Sylvania NOS 1940's (8ma)
(!!) (Best Single) UY-227 RCA Radiotron Balloon tests like new 1930 era (10.2ma)
(!!) (Recommended 27 Balloon) C-327 Cunningham Balloon mesh-plate used/very good 1930's (5.2ma)
(!!) 227 National balloon used/good, rattle inside base 1930 era (5.3ma)
(!!) C-327 Cunningham Balloon short mesh-plate used/very good 1930 (5.7ma)
(!!) UY-227 RCA Balloon NOS 1930 era (4.3ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.5ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.7ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (4.0ma)
27 National Union engraved base used/good 1930's (4.4ma)
485 National mesh-plate NOS 1940's (6.7ma)
485 National Union used/good 1940's (6.2ma)
