Quote:
Originally Posted by Jeffhs
I have a Zenith Trans-Oceanic 3000-1 all-band radio, an eBay score about a year and a half ago. It works well, but I am wondering whether this radio uses a positive- or negative-ground wall-wart; that is, is the tip of the plug at the end of the cable positive or negative? (This question was answered in another post, but I haven't found it yet.) I would like to wire the wall wart permanently to the radio, as I don't carry it around at all (too heavy). I wonder about the ground on the wall wart because of something I read here in VK some time ago, that if the wall-wart plug is wired backwards, it can destroy the audio output transformer and the output transistors. This radio sounds great on FM, so I don't want to put it completely out of commission.
Also, I am wondering about a loose wire I found on the battery case. The schematic shows it as being connected to the negative battery terminal, but the battery case in my set does not have such a terminal (this radio was modified by its previous owner to use a rechargeable NiCad battery pack, so the battery box is not original; there is also a battery fuse in series with the positive lead to the pack). If need be, I will use the battery box from my Zenith T/O 1000-1, but if the 3000's can be rewired I'd just as soon use it.
Thanks for any and all replies.
|
IIRC, the set requires 12VDC @ around 1.0 amp.
Is there a external power jack on the radio. Going by memory again, it seemed that the jack was smaller, than the earphone jack, like 2.5 mm and the tip was negative. The AC adaptor, I picked up for it, had reversed polarity, so I had to change it, by cutting and resplicing the cable for the proper polarity. It was done neatly by staggering the splice and using heat-shrink sleaving. The owner understood, that was the only way it could be done, as the case of the adaptor was securely glued together and couldn't be opened without destroying it.
