(!!!) (Best Pair) 1625 National Union NOS 1944 (90/40 x 2 tubes)
(!!!) (Best Pair) 1625=VT-136 National Union NOS 1943-1944 (87/40 and 90/40)
(!!!) (Best Pair) USN-CRC-76 RCA like new 1940's (5.8ma and 5.9ma)
(!!!) (PAIR) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.3ma and Gm=700 x 2 tubes)
(!!!) (Recommended Pair 1957) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (56-59/40 and 57-60/40)
(!!!) (Recommended Pair 1957) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (57-61/40 and 57-62/40)
(!!!) (Recommended Pair) 12BZ7 National Union branded Admiral and Sylvania "U" getter NOS 1960-1961 era (1.6/1.6ma and 1.7/1.8ma)
(!!!) (Recommended Pair) 56 National Union rebranded Western Electronics NOS 1940's (4.9ma and 5.1ma)
(!!!) (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)
(!!!) (Recommended Pair) JAN-CNU-1625=VT-136 National Union NOS 1940's (80/40 and 78/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1954 (58/40 and 60/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (57/40 and 58/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1971 (56/40 and 58/40)
(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)
(!!!) 76 RCA NOS 1940's (4.5ma)
(!!!) 76 RCA NOS 1940's (5.4ma)
(!!!) 76 RCA NOS 1940's (6.0ma)
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)
(!!) (Best Single) 27 Philco by Sylvania NOS 1940's (8ma)
(!!) (Best Single) UX-201-A Radiotron Balloon used/tests like new brass pins 1930 era (4.4ma and Gm=800)
