Thats the amp with the dual rectifier tubes and uses EL 34's is that correct? It's a huge amp. I had a freind who owned one and he did a couple simple upgrades. Man that really is one of the sweetest amps on the planet. I envy you. And the 400 pre-amp ; well, you don't ever have to buy audio gear again IMO. So what Kind of information would you be interested in? The TD 124 needs a new base and armboard and the amp and pre-amp need simple upgrades and restoration such as electrolytic cap replacement and coupling/filter caps re-done. After that you are in audio heaven. Have you checked the internet for some of the sites that support those units?