[rotorwrench]

Many times the points need to be cleaned in the old vibrators. A lot of them can be brought back to life. They are not polarity sensitive. the old radios needed the higher voltage to make the tubes function properly. Tube type amplifiers have excellent frequency output. A lot of electric guitar players still prefer the old tube type amps to the solid state units. The old capacitors are the things to replace in the old radio sets.