Details
Ballast, nominal voltage drop 55 volts at 300mA. Typically intended for radios using one number 40 or 47 dial lamp.
Known uses include:
Autocrat 61-25L6
Automatic D5, T
Capitol W-105
Crosley 568, 598
Espey 550
Freed FE24A
Knight A110, E10805
Radolek R17511
Sonora A11
Trav-Ler 420, 450, 521, 550