For your consideration is one Type-10 power triode vacuum tube with ceramic base. Tube features charcoal-black plates, dimpled-D-foil getter and ceramic base construction. Hickok 539B is a mutual conductance (Gm) type tube tester.
For your consideration is one Type-10 power triode vacuum tube with ceramic base. Tube features charcoal-black plates, dimpled-D-foil getter and ceramic base construction. Hickok 539B is a mutual conductance (Gm) type tube tester.