99=X-199 Silvertone NOS 1934 (2.5ma, Gm=500) (strong single)
99=X-99 RCA Radiotron NOS 1930's in sealed box (2.2ma)
CX-299=99 Cunningham NOS 1930 era (2.1ma)
UX-199=199 RCA Radiotron NOS 1930 era (1.7ma)
