68.51.4.172
In Reply to: RE: It seems that.... posted by Jim Austin on May 15, 2009 at 18:02:02
Here are 2 aspects of our typical amp circuit topologies that you need to have studied:
- Amplifer class: A, AB, AB1, B, C, D, etc.
- Single Ended and Push-Pull
There are plenty of books on these subjects and even a bunch of stuff online. The proper way to study these, however, is to get some older college text books on circuit design and then analyze a number of the seminal topologies such as the Williamson. Also, the old tube books from Mullard and RCA had a lot of the analysis you're looking for.
As for making something like an Excel spreadsheet to try to simplify the whole thing, I wouldn't want to embark on such a mission to cover amps found today.
What I would suggest is that you take a look at the well respected amps of each generation. For instance, the 60s could be summed up with the HK Citation II, the McIntosh MC275/225, Fisher's 800 receiver and a Scott of similar stature. You'll find many, many commonalities in the circuit topologies but with variations like the Mac Unity Coupled Transformers, or the way feedback is used in the Citation II.
Since tubes died, for consumers in the 70s, you'll have to switch to SS topologies, of course. Still there's a similar trend found within SS gear where lower parts count drove the use of direct coupled amplifiers and then on into Integrated Circuits.
After the 70s, most tube amps didn't do much of any profound topology changes and just reissued amps with the classic topologies - despite what their marketing departments insisted had been done.
Cheers,
David
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