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In Reply to: RE: If that is what you want to know then.... posted by Charles Hansen on May 16, 2009 at 12:19:49
...that the ARC (which one should I look at?) and the Vacuum State amps are, in your opinion, original and important modern (i.e., post-Williamson)topologies? Any others come to mind?
Thanks very much,
Jim
Nothing else springs to mind in terms of companies that were innovative AND are still in business.
You can spend weeks going through the ARC schematics and following their history step-by-step. They are unnecessarily complex in my opinion (at least the earlier ones) but they are certainly original.
Allen Wright's designs are also quite original, although he is not so prolific nor as open as ARC once was. (I don't think they still include the schematics in the owner's manuals as they once did.)
But like I said in the beginning, it's not going to lead you anywhere near where you want to go. It will, however, be entertaining and educational.
The early ARC efforts where quite complex, at least the input/driver stages, using a cathode follower between each and every stage. With a few exceptions, the designs have become far less complicated as the years have gone by.
You are correct ARC no longer includes the schematics, parts lists in the owner's manual. Don't know why. Most likely it saves a few $$$$ on printing and most owners don't care that they are no longer included.
ARC is more than willing to give the schematics, parts list for any product they make. Just give them a ring and it will be in the mail or on the fax machine in a jiffy at no charge!
...is a completely new topology never before used in audio.
The only hint of it ever being used before anywhere was from a friend who said he saw the same concept (but not exactly the same circuit) in some old schematics at a company who built control electronics for atomic power stations in Germany in the 60's!
I guess they needed serious precision as well...
Regards, Allen (Vacuum State)
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