UF89=12DA6 Telefunken made by Philip Italy NOS 1969-1970 (107/60)
UF89=12DA6 Telefunken NOS 1963
UL41=45A5 Miniwatt France NOS 1962-1963 (3 in stock)
UL84 GE Spain 1967
UL84=45B5 Amperex Holland NOS
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-5651WA Raytheon NOS in CK5651 box (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 RCA Balloon used/very good 1930's (41/25) (2.6ma Gm=900)
