Spica TC-50 and amp advice

It's amazing the different ampifiers used with the Spica TC 50's. I have had my best luck with a Dynaco ST 70 with Sound Valves input board. There are numerous other mods
done to it as well including a new power transformer, B+ power supply improvements. I'm also using a VanAlstine Super PAS 3si preamp and a Oppo 980 with Scott Nixon Tube DAC. I have a pair of TC60's also. I tried several solid state amps and they all sounded good but not as good as my
trusted Dyna. I have had many friends over and they were all impressed with the level of sound I had achieved.
I have tried to replace the Spicas with speakers that cost up to $5000 and the Spicas still remain. My room is 13 x 14 feet also. My first killer system was a pair of Spica TC 50's with the PS Audio IV a Spica Sub and SOTA TT with JS Technology Air Bearing Tonearm with a Sumiko Talisman S
LO cartridge. I embarassed a friends system that cost nearly $40k during the mid 80's. Vinyl was still king and I was enjoying it serving our country. Twenty Five years later I am on my 5th pair of TC50's and First pair of TC60's. I say tubes first and make sure the the power supply is designed properly. Good Luck and happy listening.

Nearly everyone missed that you have a PS Audio IV preamp which is still quite viable with separate power supply. There are several very good choices to include the Hafler 120, the best sounding Hafler amp. The Dynacos are great also.

This speaker is fairly simple to crossover upgrade and will sound much better with improved imaging, detail, quickness and extended bottom. They also need good stands.

I set up a system for my girlfriend based on TC-50s, but using "old" Linn electronics. Sounds great.

Experiment with cables. Silver tend to have a more lifted top end with the PS. Copper tends to be smoother and will sound rolled off under some circumstances. You can even run a long cable run with the PS Audio. One last thing use it in the passive mode and if you are into vinyl download a manual or contact PS Audio to see if they have one lying around. Change those resistors in the Phono mode to the appropiate ones for your tonearm and cartridge. You will get a plesant surprise.

Thank you to all who commented. It looks like I have a little research to do.