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Tool Talk Discussion Forum

Re: Autotransformer

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Author  [Modern View]

06-20-2013 08:28:21

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"[A]lthough pulsing on and off application of DC (like when points open and close in tractor ignition) does create a rising and collapsing magnetic field so transformer action can produce HV...."

Hence, the so-called "vibrator" used in early automotive tube type radios to generate the B+ voltage for the tubes.


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John T

06-20-2013 09:56:42

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 Re: Autotransformer in reply to Dean, 06-20-2013 08:28:21  
EXACTLY it was the same operation, the vibrating (open/close) metal contactor made and broke the DC circuit which first created a magnetic field but then it collapsed when current stopped, therefore via transformer action the turns ratio was used to produce HV in the Secondary.....I have one of those old noisy humming heat producing radios in my shop....

John T

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06-20-2013 12:01:05

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 Re: Autotransformer in reply to John T, 06-20-2013 09:56:42  
Tube type superhetrodyne automotive radios were good AM receivers for their day.

I well remember the "Sonomatic" radio in my Fathers 1951 Buick with the antenna mounted just above the center of the windshield and rotatable by a knob above the rear view mirros.

The radio still worked when the car was scrapped in, I believe, 1969 or 1970.


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