I don't think you need to spend anywhere near 18K to make a significant improvement to your system. A quality tube integrated amp would take you where the Altecs are designed to run. I'd look at a Prima Luna EVO 400. You'll have plenty of power with 70 wpc of tube power. Then spend a modest amount on interconnects and loudspeaker cables. I recommend solid copper wires. I'd also take dogberry's advice, that is spot on.
I feel it is time to upgrade my 1977 system.......
I have been enjoying my Pioneer Spec 1 and Pioneer Spec 2 system for a very long time and I have been having issues that have exhausted my patience and nearest shop is 3 hours (each way) from home. I only listen to my Music Hall TT that pleases me. My speakers are from 1976 Altec Lansing Model 19 that have been freshend up and I love the sound, I guess because I have been so accustomed to them and I'm sure there are many diff speaker options but for now I wish to continue with the Altec's. My quest is to replace my amp and preamp.........I have some logistical problems to deal with. I have ONE!!!! location for new gear, a shelf that is 51 inchs long and 18 inches from a wall to the front edge of the shelf, shelf will handle 200lbs. My Pioneer amp has ample power and I would like to remain close to the same amout of power. If you have some ideas for me I would love to hear them. Not sure how I feel about tube gear since I have no background at all so I (think) I'd rather not go that route, but feel free to change my mind. Budget not to exceed 18k including cables. I know there is a wealth of knowledge here unfortunately I have very little to offer so I thank you greatly in advance......