Author Topic: Flyback tranformer invention date  (Read 160 times)

Offline MRMILSTAR

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Flyback tranformer invention date
« on: September 09, 2020, 11:28:57 PM »
Does anyone know when the flyback transformer was invented? The earliest reference that I found is in the early 1960s. If this is accurate then what was used in TVs made in the 1950s and 1940s? The reason that this question came up is that I have a small VTTC that I built in 1969. It uses a Miller 4526 RF Transformer for the primary coil, secondary, and feedback coil. It is not a flyback transformer. It is an air core RF transformer consisting of a primary coil, a secondary coil, and a feedback coil. So apparently it was intended to be used in an Armstrong oscillator circuit. The output as used on my VTTC is about 30 KV.

Since the Miller coil was obviously not designed to be used in a small VTTC, someone had asked me what the intended application of the Miller 4526 RF transformer was. I had speculated that it may have been used instead of a flyback transformer in older B&W TVs. Does this make sense? What other application might it have been used for?

This coil is no longer available and is difficult to find. Attached is a picture of the Miller 4526 RF Transformer as used on my VTTC.
« Last Edit: September 09, 2020, 11:38:39 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
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Offline davekni

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Re: Flyback tranformer invention date
« Reply #1 on: September 09, 2020, 11:54:10 PM »
Given that the horizontal deflection coil needs the same sort of waveform as the flyback, it's hard to imagine any design using something other than a flyback for CRT anode voltage.  However, I have no real information.  Of course, old flybacks were AC output feeding a tube rectifier.  I think the oldest TV I've disassembled was also early 1960's vintage.  Every TV I've seen has the flyback primary and horizontal deflection coils in parallel (not counting horizontal deflection adjustment inductors added to the deflection coil part of the circuit).
David Knierim

Offline klugesmith

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Re: Flyback tranformer invention date
« Reply #2 on: September 10, 2020, 04:55:47 AM »
I know just the TV collector to ask about that.  In the meantime, enjoy picture from Collectors Weekly.

Any magnetic deflection yoke would need pulses on the order of 100 volts for horizontal return sweep, at horizontal scan frequency.  Sawtooth current waveform not unlike those in ignition coils (which need gapped cores) since 19th century.  Transformer economies from high frequency were well known.  When did ferrites appear in the EE world?

OTOH, I bet TV's evolved from CRT oscilloscopes, with electrostatic deflection & sawtooth voltage, and conventional transformers for anode voltage.
« Last Edit: September 10, 2020, 05:09:47 AM by klugesmith »

Offline johnf

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Re: Flyback tranformer invention date
« Reply #3 on: September 10, 2020, 06:47:25 AM »
Ferrites were developed during the second world war
with the earliest declassified mentions coming around 1944.
Yes early valve (tube) tv sets used ferrite cored flybacks valve driven for the EHT with seperate HV valve rectifier. The first deflection yokes were air cored and massive. Ferrite bought these down to size in the early valve (tube ) TV sets

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Re: Flyback tranformer invention date
« Reply #3 on: September 10, 2020, 06:47:25 AM »

 


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