In 1975 you could tell that Dynaco was phasing out tube gear and was converting over more and more to solid state equipment. The only tube items left were the Mark III, ST-70, SCA-35 integrated and the PAS-3X preamp. Although they would assemble almost any of the solid state gear equipment for you, they were slowly getting out of factory wired TUBE gear. The only one of the 4 tube items left that you could still get factory wired was the Mark III power amp.
Be sure to check the last page. In November of 1974 the FTC (Federal Trade Commission) set up stringent regulations on how the output of amplifiers had to be advertised. The Mark III was down to 50 WPC, the ST-70 down to 20 WPC and the SCA-35 was 7 WPC. The bandwith of these tube amps also had to be reduced to 50 to 10,000 Hz to comply with the new regulations. Also on the last page you can see that Dynaco, which was in Philadelphia, had now moved to Blackwood, NJ. In 1968 Dynaco sold out to Tyco Laboratories. Tyco owned Dynaco until about 1979 when it was sold again to ESS Inc who never really did anything with the brand name. The "Dynaco" brand was picked up by Panor Corp. in Japan in the early '90's. The "Dynakit" brand name, however, which is now separate from the "Dynaco" brand name, is owned by Dynakitparts in Clifton, NJ.
Bob
