I've owned the TC-50s (and 60s and Angelus) on many occasions and found one of the best synergistic fits to be the venerable B&K ST 140. One zigs where the other zags and the result is better than either on its own. Really, any of the older B&K amps would be a great choice as they all had that warm mosfet sound. Great thing about it you can often find a ST-140 for around $150-200. Best of luck to you in your search.
Spica TC-50 and amp advice
I was recently given a pair of Spica TC-50 speakers and am not sure which direction I should go regarding an amplifier. In the meantime, a friend is letting me borrow his Baldwin 6L6 tube amp. I'll also be running a PS Audio IV preamp, California Audio Labs CL-10 cd player and a Rega turntable. I'm newly divorced and finally get to enjoy my equipment. My new living room is approximately 13'x14', and I have thousands of live shows I've collected through the years and want to be able to get the best out of what I'm working with. I've budgeted $500 for an amp and don't know which route to go. Any advice or suggestions is greatly appreciated.