(!!) (BEST PAIR) 6AU4GT Tungsol NOS 1957
(!!) (BEST PAIR) 6AU4GTA RCA and Arcturus NOS 1960 era similar build (92-92/60)
(!!) (BEST PAIR) 6AU4GTA RCA coin-base NOS 1970's
(!!) (BEST RCA PAIR) 6AU4GTA RCA NOS 1961
(!!) (PAIR) 6AU4GTA GE coin-base NOS 1970's
(!!) (PAIR) 6AU4GTA RCA coin-base NOS 1970's
