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 Post subject: Vitrohm voltage divider question
PostPosted: Aug Sun 18, 2019 4:24 pm 
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Joined: Jun Mon 19, 2017 4:33 pm
Posts: 45
Location: York, PA 17406
The voltage divider is open on a radio I’m working on and there’s no schematic. The section that is still good is at about 3,000 ohms. It’s exactly twice the length of the two open sections. Is it a fair assumption that the two areas in question are about 1,500 ohms? Thanks for any help you can give. - Rob


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Sun 18, 2019 4:48 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7595
Location: Minneapolis, MN USA
Maybe no schematic but you can help us by giving us make and model if not plus the tube lineup.


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Sun 18, 2019 8:04 pm 
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Joined: Jun Mon 19, 2017 4:33 pm
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Location: York, PA 17406
It’s either a homebrew or a kit..probable tube lineup is 80, 26, 26, 26, 27, 26, 50..Not a whole lot to go on.


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Sun 18, 2019 10:09 pm 
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Location: Detroit, MI USA
Not sure if you can easily make that determination, because resistance wire was available with various different numbers of ohms per foot. So it's entirely possible that one section was wound with wire having a different characteristic than other sections of the same resistor.

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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Sun 18, 2019 11:59 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
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Location: Sunbury, Ohio 43074
a few photos might help....

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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Mon 19, 2019 2:12 pm 
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Joined: Jun Mon 19, 2017 4:33 pm
Posts: 45
Location: York, PA 17406
I’ll get a picture in the next day or so. While poking around I found a 3,000 ohm resistor bridging the voltage divider so it is completely open. What might be pertinent is that Vitrohm advertised voltage dividers for radio builders, using 5,000, 3,000, 1,500 & 750 ohm resistances. At some point I might just put the original parts back in and display it. What I hadn’t known before I got the radio was how popular radio kits were in the 1920s. Still it would be nice to get some sound out of it. Thanks for the feedback. - Rob


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Fri 23, 2019 4:41 am 
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Joined: Jun Mon 19, 2017 4:33 pm
Posts: 45
Location: York, PA 17406
The answer in this case is yes, the resistance is 1,500 - 3,000 - 1,500 ohms, so the same resistance wire was used throughout the voltage divider. I lucked out on this one. Got a kit built radio working that was (according to the note inside) last worked on in 1931. Thanks. - Rob


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Fri 23, 2019 2:15 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1934
Location: Lafayette, CO
Lucky you. Not all these have the same wire inside. Craig


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 Post subject: Re: Vitrohm voltage divider question
PostPosted: Aug Fri 23, 2019 7:58 pm 
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Joined: Jun Mon 19, 2017 4:33 pm
Posts: 45
Location: York, PA 17406
One thing that helped was spending a couple of hours going through the Allied Catalog to familiarize myself with the components in the radio. But luck was definitely involved too. - Rob


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