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 Telefunken <> bottom NOS (tuning eye)
UM80 Valvo Holland tuning eye NOS (2 in stock)
UM84 Valvo used (tuning eye)
USN-5651WA Raytheon NOS in CK5651 box (1 in stock)
USN-CHY-1616 Hytron USA tests like new - scratches on base 1950's (54/40)
UX-120 Radiotron used/tests 35% (low Gm=100) (display tube)
UX-199=199 RCA Radiotron NOS 1930 era (1.7ma)
UX-201-A Radiotron used/very good 1930's (2.5ma Gm=700)
UX-201-A RCA Radiotron Balloon tests like new 1930's (read review)
UX-226 RCA Radiotron balloon used/good 1920's (3.7ma Gm=900)
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)
