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I remember replacing those devices. The phone company calls them “line fuses”. They work good on devices that are primarily “voltage” driven pieces of equipment (phones, amplifiers, ect.). You know, good ole electron tubes.
Today however, most devices are solid-state and current driven. If the least bit of high voltage were to be present on the junction of a solid state device (transistor, FET, JFET, MOSFET or integrated circuit), it would simply weaken and fail. I have replaced tons of them for that very reason. A metal oxide varistor, shunted across the line out or in, helps to knock down the destructive voltage. However, I have found nothing helps in the face of a direct strike. Poof! Pow!
Which brings me to the “Electronic Theory of Smoke”. All electronic devices work on smoke not electrons. The proof is, when you hook something up wrong and you let the smoke out the device, it quits working. Try it out. Its fool proof. On second thought, don’t try it out.
Thank you for the walk down memory lane.
Marshall Johnson, Sr.
Rhema Radio – The Word In Worship