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Tube Choke Condensor Vibrator (used in HV battery supplies) Valve is another term for vacuum tube, used in old radios.

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16y ago

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Why does your alarm clock radio still make a crackling noise even when turned off The noise is intermittant and is very low but the noise is a concern and it continues all day?

You didn't describe the type of clock radio or age so the following are just guesses to apply to your situation. Unplug the radio from the wall. If the noise still persists, it isn't the radio, but something else around the radio. Is the clock and old fashioned mechanical clock. If so it could be the clock motor. The radio could still be on when you think it is off. This is possible in some models where the on/off switching is electronic rather than mechanical. There is something living inside the clock radio. Sound will persist even when unplugged. There is a strong electromagnetic field in vicinity of radio which is causing a resonance frequency in the radio electronics even when off. Move the radio to another part of house and see if sound changes.


How do you make a radio-frequency generator?

you go out and beat up and rob an old lady for hers.


How old do you have to be to have a ham radio license?

Somewhat oddly, and this also applies to another federally-monitored (Hobby) prospecting, there are no statutory age requirements. there have been ( most exceptionally) some adult-coached Hams as young as 8 in the fifties. There are different categories of exams for different classes of operators ( within the Ham envelope- this does not include C.B. ) some require code proficiency, some do not.


An air-variable capacitor migth have a range of?

An air variable capacitor might have a range of a few picofarads (high voltage units) to several hundred picofarads (in an old AM radio).


What are some old inventions that need to improved?

the silent vacuum cleaner