Good day folks so I am currently looking for information on a fully symmetrical amplifier. Attached is the topology that i am focusing on. All I have is the topology that was given to me and i am getting difficulties in finding the book where it was taken from, could anyone assist me?
Thanking you in advance!
Thanking you in advance!
Attachments
Much has been done with this particular topology.
(below 1) is the "intro" version , it nearly matches the "deluxe" (below 2).
Ran the second one for 7 months - REALLY pushed it ! Supreme bass ,very
detailed reproduction.
Builders like the simple first example. Both can be overloaded eternally.
http://www.diyaudio.com/forums/solid-state/248105-slewmaster-cfa-vs-vfa-rumble.html
-#7
I'm about to combine the two. #1 has the best clipping .. #2 has the more refined
input stage.
Oh - where I started , Leach Amp Plans - Part 1
The good Professor (RIP).
OS
(below 1) is the "intro" version , it nearly matches the "deluxe" (below 2).
Ran the second one for 7 months - REALLY pushed it ! Supreme bass ,very
detailed reproduction.
Builders like the simple first example. Both can be overloaded eternally.
http://www.diyaudio.com/forums/solid-state/248105-slewmaster-cfa-vs-vfa-rumble.html
-#7
I'm about to combine the two. #1 has the best clipping .. #2 has the more refined
input stage.
Oh - where I started , Leach Amp Plans - Part 1
The good Professor (RIP).
OS
Attachments
Last edited:
This was the original so-called Leach Amp and has been very popular indeed. It was a design appearing in Audio Magazine, which appeared while I was in EE school in 1976 that I just happened to see, and it had a profound impact on me. The latest design, including a higher powered version, are on the Dr. Leach website (who is now deceased) through Georgia Tech. Simply google "Marshall Leach" and you will find his designs, notes and construction details.
There are many designs based on this amp, and this site has some updated versions.
Sound wise, most seem to think it is up there with the best when built correctly. The fully complementary symmetric design in a practical implementation may not be as good as the theory would indicated (can't match the NPN input stage transistors with the PNP stage and thus cancel out the 3-rd order distortion), but it never-the-less is a great design and has been proven to be a hardy amp for newbie amplifier builders.
If you are thinking of building this amp, get the latest design, or look up the updated version that use updated components. You can hardly go wrong.
- Status
- Not open for further replies.