The 10 was a 12 watt triode with a mu of 8. It was usable up to 15 MHz. Early versions were called UX-210 (RCA) and CX-310 (Cunningham) although they were identical and made in the same factory. The DeForest 410 and the PA-210A (Perryman) were .5 inch longer. The Perryman also had a mesh plate. There were also variations in construction as can be seen in the double horizontal arbor in the CX-310.
Length = 5.00" Diameter = 2.00"
Max voltage = 425
Max current = 18 ma
Fil voltage = 7.5
Fil current = 1.25 amps