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TerryMSU
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#1

11-23-2016, 11:07 PM
Today's finds. We are visiting the in-laws in Iowa City. Went to a farm house in Iowa to purchase a 46-350 that I found on Craigslist. Came home with that AND a Silvertone 7104 farm radio. Total of $40. The Silvertone uses a 2 volt "A" battery and a 90 volt "B" battery. I am looking for the cheapest solution to get this up and running. Ideas?



Thanks,
TerryMSU


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GarySP
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#2

11-24-2016, 01:59 PM
Nice finds! The B battery is easy... 10 9volt batteries in series will work. As for the A battery, 2 1.5 volt batteries in series and calculate a resistor to bring them down to 2 volts perhaps? I'm sure other will chime in with possibilities for you. Take care, Gary
"Don't pity the dead, pity the living, above all, those living without love."
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Gary - Westland Michigan
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TerryMSU
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#3

11-24-2016, 02:07 PM
I have a lab power supply for the filaments, so that is the easy part.

Thanks,
TerryMSU
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Arran
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#4

11-25-2016, 04:18 AM
 If the Silvertone does use 2 volt filament battery tubes and not 1.5 volt ones, not many sets used 2 volt tubes after 1938. The B+ supply is usually easy if it's only 90 volts, you can make a supply similar to what the 46-350 uses with a three section pi filter arrangement.
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Arran
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jerryhawthorne
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#5

11-25-2016, 10:12 PM
There are so many nice schematics for building a 90/1.5 powersupply. I'm certain with a few mods it could handle 2V. I have built three into a case with graphics to look pretty stock. I just didn't wish to replace batteries! Yes, it does have an A/C cord coming out.
Jerry

Here is a picture of a 90V/1.5V powersupply built into a nice box with graphics to run a farm radio.

[Image: http://i303.photobucket.com/albums/nn129...Radio2.jpg]
A friend in need is a pest!  Bill Slee ca 1970.
(This post was last modified: 11-25-2016, 10:22 PM by jerryhawthorne. Edit Reason: add picture )
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TerryMSU
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Posts: 45
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Joined: Oct 2016
City: Jackson, MI
#6

11-26-2016, 09:26 AM
(11-25-2016, 10:12 PM)jerryhawthorne Wrote:  There are so many nice schematics for building a 90/1.5 powersupply. I'm certain with a few mods it could handle 2V. I have built three into a case with graphics to look pretty stock. I just didn't wish to replace batteries! Yes, it does have an A/C cord coming out.
Jerry

Here is a picture of a 90V/1.5V powersupply built into a nice box with graphics to run a farm radio.

[Image: http://i303.photobucket.com/albums/nn129...Radio2.jpg]

It looks like this is a 1.5 volt filament radio. Any recommendations for battery replacement circuitry that anyone has used? I have the background to tweak any design that shows up, but a proven design may help me to find just the right parts.

Thanks,
TerryMSU
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