The UV217 "Rectron" is an early high voltage rectifier circa 1921. Insulating material holding the pins is mica. A gridless UV203. Replaced about 1924 with the UV217A.
Length = 7.25" Diameter = 1.88"
Max voltage = 1500
Max current = 200 ma
Fil voltage = 10
Fil current = 3.25 GOTO INDEX