old radio philco 3985 - Printable Version
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old radio philco 3985 - Guest - 07-11-2010
I have a radio philco 3985, I want to fix it but I dont know what kind of battery they use and where can I find . Please, I need somebody to help me.
jaimepaz16
Re: old radio philco 3985 - rghines1 - 07-12-2010
Think you meant model 39-85, the 39 indicating year 1939.
Below is the schematic link. Uses 2 batteries, 1.5V high current for the filaments and 90V low current for the plates. However the batteries are obsolete but a 1.5V D cell and 10 transistor batteries wired in series will work assuming they will fit inside the radio. Richard
http://www.nostalgiaair.org/PagesByModel/312/M0013312.pdf
Re: old radio philco 3985 - TexMac - 07-18-2010
Just be sure you connect the batteries to the right plugs. They appear similar on that schematic. 90V mistakenly connected to the tube filaments will fry the tubes instantly. I have a lot of battery sets using modern equivalent batteries that I build myself, as described. If you are unsure how to connect them, feel free to contact me by email and I can supply some pictures of how it is done. I can then post them on this thread for others, but I have so much stuff I need to know specifically what you need so you do not go into information overload.
Re: old radio philco 3985 - TexMac - 07-18-2010
Here are some pictures of mine and some I found on the net that show examples of 1.5/90V combination A-B batteries.
[Image: http://i75.photobucket.com/albums/i305/mcaliron/Clipboard.jpg]
Note that they use several 1.5 batteries connected in parallel (all the plus ends connected together and all the negative ends connected together) so that the useful lives of the A battery and B battery will be nearer the same. The voltage is still 1.5 volts, but the amp hours add together.