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Ebay!!
That is where I got BOTH of mine, and I have seen several of the smaller ones(rm-90), as of late. It worked pretty well, when I got it, aside from a loose dial pointer and bad bulb for the dial, and to replace the foam for the speaker.
The rm-300, may take longer, but I still got mine there. This one did NOT work very well, it had a real low, distorted volume, like a bad coupling cap in the amp, but that was NOT the problem. I found that the first audio predriver transistor had almost no b+ on it. traced that to a very leaky cap, from the 28 volt b+ line, through a resistor, and the cap was pulling the volatge(which should had been about 14 or so, )down to about 1 volt. Put a modern cap in.... it CRANKS now, and other than the meter bulb,(#159 type, in both radios) all I need to do now, is replace the foam, behind the speaker(as I did in the other one).
BTW-- I paid LESS than $20,(including shipping), for this one, and about 25 for the other one.
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