Battery For Fender Mount Radio

What kind of battery should I use for my fender mount radio? I'm planning on a 12 volt, should I use a car battery or can I use something smaller? I tried it on the battery pictured below, a small 12 volt I use on my fish finder. It is set for a positive ground, so I hooked the small red wire to the posit I've, and the larger wire with the 3A fuse to the negative. It didn't come on, nothe sure if the battery is charged. If the battery has charge, should this setup work (with maybe a different battery), at least in theory? Thanks
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That radio's power supply might take 6 to 7 amps to run the tubes and transformers. If that battery was fully charged it might last an hour before the voltage dropped to the point that it fades. Are you sure it is a 12v radio??? if it is 6v it will smoke for a few minutes and never make a sound. If yur tractor is charging and the correct voltage, why not use it? Jim
 
When I searched the patent number, it said it was a "radio capable of operating over a range of D.C. supply voltages from 3 to 18 volts while direct-coupling supply potentials to the transistors from the vehicle D.C. system without any switching or cornponent changes whatsoever." There is a small switch on the front, which I figured was to switch from 6 to 12, because the patent also mentioned the "radio which can be used with either a 6 or 12 volt system by manual selection with a switch." So I figured either could be used. So maybe I should try a car battery, but the wiring should work, am I right? Thanks again
 
A car battery will work but why not use the tractors system. I would try it on 6v first as the switch would allow a safe selection of 6v (it would work) or 12v it would not work. If the tractor has no charging system or starter, then by all means use a car battery. I did not read the earlier post saying it was transistor, so it would last far longer on that 9Amp hour battery shown if it was charged. probably 4 or 5 hours. Jim
 
That looks a lot like the fender mount radio I used many years ago. It had a little rectangular cover on the rear attached with several screws. Under this rear cover were two slide switches to select either 6 or 12V and the other to select pos or neg ground.
 
Can you hear a "plunk" from the speaker when hooking up the batt.?
If there is not a plunk noise, test the speaker using a 1.5 volt
AA, C, or D cell.
Disconnect 1 speaker lead, & use a piece of wire to momentarily
touch the speaker leads with the battery.
If you don't hear a noise from the speaker when doing this, the
speaker is probably bad.
They had a high attrition rate.

Second thing to try is shorting across the switch on the back of the
volume control with a small screwdriver.

As in the other post, make sure the polarity "switch---plug" is
making good contact.
Jim
 
I took off the back cover and found two switches. I know the one that is round and reddish is to select the ground. I'm not sure what the other one is for, the little silver dial with the slot for a screwdriver. I don't know what that one does, maybe that is to select the voltage???
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" the little silver dial with the slot for a screwdriver"
That may be what I believe was called an antenna padder, a variable cap to match the antenna to the radio. You would tune to a station about mid band, then adjust that screw for the strongest signal.
 

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