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It may be old technology, but honestly, the radar guns still emit the same signals that these radar detectors look for to alert you. Newer detectors may have a little better sensitivity and better anti-falsing technology, but basically there isn't much difference between one made in 1980 and one made today. (Kind of like an AM radio)
This model has been out of production for quite some time. You could try contacting Uniden to see if, by chance, they still have some replacement speakers for this older RD model. In any event, you would be well served to purchase a modern radar detector which provides far better performance. Personally, I recommend products produced by the following manufacturers:
Bel Escort Whistler (their higher end products -- XTR-690 model or higher. Their Pro78 or newer Pro78SE is one of my favorites.) Valentine
Uniden has been out of the radar detector business for some time now. I would strongly suggest getting a different radar detector instead of using this older model since newer radar detector models generally have far better performance -- especially for detecting Ka band radar.
Anyway, Uniden's web site does not list an instruction manual for this particular radar detector model. Yet, take a look at the instruction manual for the most similarly numbered product model shown in the following link: