Hi Thad, I will have to look at the old system to see what model numbers they were. I don't think it much matters as to the model number, just so you can get a diagram for the amp and that the tubes and everything else does not need more than 12 volts. You can determine this by checking the output of the main transformer. As long as it is no more than 12 volts before it goes into the rectifier, you are set. You can also get an idea by looking at the tubes, the first one or two numbers are usually the tube voltage, like 12AX7 would be 12 volts and a 6GH8A would be 6 volts. This is just a rough way to tell and not always accurate. There are ways to duplicate the sound of tubes with transistor equipment that might be easier than this. As far as the tweeters and midrange, the older type speakers covered the whole range pretty well and if you start separating the frequencies you are not going to get the sound you are looking for. Your best bet might be a large good quality transistor amp with a good equalizer. This will allow you enough power and enable you to come up with that slightly fuzzy tube sound until some idiot gets into your car and changes your settings on the equalizer that it took you an hour to set. As for the reverb, you might want to go to your local music store that sells amps and instruments etc. and get a small solid state guitar reverb. They will also have fuzzboxes and other items that might give you what you want a lot easier. Above all else, you must listen to the different amps through the same set of speakers with the same head unit as they all have a slightly different sound. As an example, I do not like Alpine equipment as the sound seems to dead with no life to it. I seem to have very good luck with the cheaper stuff as it seems to give just the right amount of distortion. Radio Shacks amps have worked the best for me, along with their speakers. As far as mechanics are concerned, there just ain't any left anymore. They are all just parts changers and half the time they can't even do that right. I think that this is the publics fault more than anything else because they don't want to pay the price of someone who has the knowledge and training to work on their car. All it seems they want is cheap. When I had a repair shop, most of the people would balk at paying 200.00 for a repair on their 20,000.00 investment but would gladly pay 150.00 to fix their 500.00 TV. I could never figure it out. Oh well. Let me know how you do with the stereo's and if you need any more info or help let me know. If you want to chat about anything or need a fast answer, I can usually be reached at 973-564-7648. This is my shop number but I am almost always here. If you get the machine, just leave me your message and phone # because sometimes I don't hear the phone or I am outside under a car. Allan R