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Old 11th September 2012, 04:14 PM   #1
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Osvaldo de Banfield's Avatar
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Default Old MUNTZ TV ciercuit

Hi all guy´s I'm searching in Google with no results, a schematic circuit for a Muntz TV set circa 1950 in which the frame output tube use a tertiary in the output transformer to make an blocking oscillator itself, feeding the screen with a positive pulse from these transformer. I want to know if somebody can send me a scan of this circuits, and if the case, oscillograms of it.

Thanks in advance.

PD: I saw this circuit in a old TV repair book far time ago. But no details about this circuit.
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Old 11th September 2012, 06:24 PM   #2
RJM1 is offline RJM1  United States
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Good luck with that.
You might look here, but it doesn't look promising.
Muntz M-21
What is the model number?

Last edited by RJM1; 11th September 2012 at 06:32 PM.
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Old 11th September 2012, 06:30 PM   #3
Enzo is offline Enzo  United States
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Get the exact model/chassis number. First place I;d look is Sams Photofacts. That used to be THE source for service documents in the TV repair days. Once you know which Photofact file number it is, you MIGHT even find it floating around the internet.
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Old 11th September 2012, 09:08 PM   #4
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I can remember a Muntz that used a spring wrapped around the HV rectifier tube to provide feedback for the grid. Haven't seen schematics for these sets since the 60's.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 12th September 2012, 12:05 PM   #5
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Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
I saw this circuit in a TV repair book here in Argentina, called "Técnicas del receptor de TV", from Algarra & Rodríguez, but in this part they don´t mention chassis # nor mode nor year of manufacture. I'm interesting in this circuit because I'm planning to use that idea for a small experimental tube SMPS.

But still now, I´m thinking in other ideas.

Thank you at all.
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