charger3834 Posted February 18, 2004 Report Share Posted February 18, 2004 I am curious to know what were the most comman amplifiers used to power AR speakers during the 1960's and early 1970's. Link to comment Share on other sites More sharing options...
ar_pro Posted February 18, 2004 Report Share Posted February 18, 2004 The Dynaco Stereo 70 or Mark III were probably most often used in AR's early years. For the more affluent enthusiasts, McIntosh MC75 and 275 were big, along with the Marantz 8 or 9. Among solid-state amps, Crown (DC-300), McIntosh, and the larger Dynas were pretty commonly encountered. I once blew up (literally...there were flames, smoke, and flying parts) a Dyna Stereo 120 feeding a pair of AR-3as from a Crown preamp...that Dyna really hated the 3a's load, and the Crown's response went down almost to DC. Ker-blam! Link to comment Share on other sites More sharing options...
Guest rickcee Posted February 18, 2004 Report Share Posted February 18, 2004 Hi for a guide as to reccomended power, the AR reciever ( and inte. Amp ?) weere I think rated at 55 w/ch ? good info on the Dynacos on the Dyna site - links - Rick Link to comment Share on other sites More sharing options...
tysontom Posted February 18, 2004 Report Share Posted February 18, 2004 >>>The Dynaco Stereo 70 or Mark III were probably most often used>in AR's early years. For the more affluent enthusiasts,>McIntosh MC75 and 275 were big, along with the Marantz 8 or 9.>Among solid-state amps, Crown (DC-300), McIntosh, and the>larger Dynas were pretty commonly encountered. I once blew up>(literally...there were flames, smoke, and flying parts) a>Dyna Stereo 120 feeding a pair of AR-3as from a Crown>preamp...that Dyna really hated the 3a's load, and the Crown's>response went down almost to DC. Ker-blam!Boy does that sound familiar! The AR-3 and AR-LST were probably the hardest on solid-state amplifiers, what with the low impedances (both) and reactive loads (especially LST). I completely destroyed a Dynaco Stereo 400 amplifier -- nearly every output device in both channels -- driving a pair of LSTs very hard over a long period of time and several blown fuses later. Don't ask me what I was doing. Later I tried a lower-powered (all that I had available at the time) Marantz 250, and it ran so hot that it failed also. I went out and purchased a used McIntosh MC2200, and never looked back. The McIntosh solid-state amps, and certainly the Crowns, always seem to work well with AR speakers.--Tom Tyson Link to comment Share on other sites More sharing options...
soundminded Posted February 19, 2004 Report Share Posted February 19, 2004 The Crown DC300 and DC300A are practically bulletproof. While so called audiophiles hate them, they have proven to be one of the most reliable amplifiers ever built. They followed in the tradition of the incredible Crown tape deck, possibly the finest tape machines ever offered to the consumer. These tape decks were rated to survive a parachute drop in their own cases. McIntosh also built largely bulletproof amplifiers. Their use of autotransformers on the output stages undoubtedly made their early solid state amplifiers much more rugged. Link to comment Share on other sites More sharing options...
Guest Sean Posted February 22, 2004 Report Share Posted February 22, 2004 In the 1970's, Phase Linear aka Bob Carver and crew were the leaders in "dollars per watt". Given the inefficiency of AR designs and the relatively low cost of Phase amps, you can bet that a LOT of these two were paired together. Sean> Link to comment Share on other sites More sharing options...
ToastedAlmond Posted February 27, 2004 Report Share Posted February 27, 2004 The AR integrated amp was used to drive a lot of AR loudspeakers. 50wpc @ 8 ohms, 60wpc @ 4ohms. Link to comment Share on other sites More sharing options...
soundminded Posted February 28, 2004 Report Share Posted February 28, 2004 These published specifications were extremely conservative. They typically produced 90 wpc. Mine still works perfectly. Link to comment Share on other sites More sharing options...
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