The 566 is a half-wave mercury vapor rectifier made by deForest. It is supposed to be electrically the same as the RCA 866, but has a different size plate cap.
Length = 6.25" Diameter = 2.25"
Max voltage = 7500 PIV
Max current = 1 amp
Fil voltage = 2.5
Fil current = 5 amps GOTO INDEX