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I have a 3000-1 that didn't have a wall wart when I got it. So ended up using a 9V-rated DC wallwart, which puts out a little over 13V no-load, which drops to about 12V with the radio turned on. The radio is very happy with this.
The current draw is nowhere near 1A, but somewhat less than 50 ma IIRC. The brown wire is for the dial lites, which are on a momentary switch, and operate only in battery mode.
The reverse polarity is because the transistors are all PNP type ('stead of NPN).
And a heads up to anybody using one of these sets on battery: The battery feed-thru jack is a phenolic wafer sandwich, and develops leakage between lugs and from lugs to chassis. Mine measured 200 microamps to chassis (that's with the radio turned off, of course).
I had to get rid of the whole assembly, and since no replacement's available, made a new plug and jack set using RC model airplane connector parts.
Another 3000-1 owner also mentioned leakage in the battery jack.
Last edited by old_coot88; 06-15-2015 at 05:33 PM.
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