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UL84=45B5 Mullard UK branded Raytheon NOS 1963
UL84=45B5 RSD East Germany NOS
UL84=45B5 Telefunken Diamond Bottom NOS 1960
UM35
UM4 Adzam NOS tuning eye 1950's (5 in stock)
UM80 Valvo Holland tuning eye NOS (2 in stock)
UM84 Valvo used (tuning eye)
USN-38250=0D3 RCA like new 1944 reboxed (argon)
USN-5651WA Chatham by Tungsol NOS 1953 (1 in stock)
UX-120 Radiotron used/tests 35% (low Gm=100) (display tube)
UX-199=199 RCA Radiotron NOS 1930 era (1.7ma)
UX-874 Radiotron Balloon tests like new 1930 era
UY-224 RCA Balloon used/good 1930's (37/25) (3.0ma Gm=700)
UY-224 RCA Balloon used/tests like new 1930's rattle inside base (50/25) (4.2ma Gm=1000)
UY-224A Champion Balloon used/very good 1930's (46/25)
UY-224A RCA Balloon used/very good 1930's (41/25) (2.6ma Gm=900)
UY41=31A3 Amperex Bugle Boy France NOS 1964 (0 in stock)
UY41=31A3 Philips Miniwatt "D" getter halo NOS 1958 (1 in stock)
V2000 Telefunken
