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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-38250=0D3 RCA like new 1944 reboxed (argon)
USN-5651WA Chatham by Tungsol NOS 1953 (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/good 1930 era (2.4ma Gm=550)
UX-201-A RCA Radiotron Balloon tests like new 1930's (read review)
UX-216-B=Type 81 Rectron by RCA Balloon brass pins used/tests like new 1920's (55/40) (very rare)
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)
