power supplies in those have been known to fail after years of service , The Cobra 2000 basically came out in 1979 and had a production run until 1993 ,parts are getting slightly harder to come by and can be exspensive when found , I always thought they were pretty radios and I must admit ,they performed very well. 18 watts pep is about right 701 , most AM/SSB CB radios should do about the same on AM and SSB (give or take a watt either way) it's great that you can run a power supply to yours to make it run (-: it could be a number of things why your internil is not working. Over the years the basic things I've personally seen go wrong with those first was the AM voltage regulators go out on them , in other words , the AM side of the radio dies but SSB continues to work fine ....easy fix (-: new reg and your back in business. Power supplies getting weaker and weaker as time goes by , keying down and modulating you can pretty much see the piower dimming in all your light works in the radio , the way to tell this is to hook up a good 10 amp power supply to the dc side of the radio , if all lights up nice and healthy and stays that way after keying and modulating , that should be a pretty good indication about the on board power supply )-: , Freq counters going bannanas !!! there is a fix for some ,but most need new panels )-: now were talking a little cash if we can find one to replace it with. Like I said before , the wonderful thing about a C-2000 is there's not a lot you need to do to them for them to sound very nice on the air. It's your time and your dime after the fact. I hope the tech don't charge you an arm and a leg there 701 ? Personally ,nowadays , I think I would try and keep it simple when it would come to a older base station , The 2000's have become pains in the dairy airs for many but not for all , there were a lot of good low maintance radios out there like the 142s that you wouldn't have to worry about things going out on them as you would the 2000s some 25 years later or depending on how old the radio was in the first place. I suppose if it were me today ,I'd rather just go with a 20 some year old 148 GTL (same as the 2000) with a good power supply with less problems to worry about or deal with later on.I truly wish you the best of luck with your 2000 and I hope it can all be put back the way it should be and that you will be very pleased in the end. Have fun. (-: