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Old 5th December 2012, 10:08 PM   #11
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Originally Posted by Nelson Pass View Post
They are quite big and heavy, but otherwise pretty conventional.

Thanks for the prompt reply at 150 plus pound that sound like a real transformer and some big caps also.
Old 5th December 2012, 10:14 PM   #12
JZatopa is offline JZatopa  United States
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I don't think Baptcha is trying to call anyone out, he just wanted to give some credit to some guys who seem to be forgotten about quite often. I think he is trying to push amplifier design dialog in a new direction; by adding a new view point which he feels has not been addressed yet. I have tried to do the same thing in some ways but I have found that sometimes it is hard to get people to bend their imagination in a way they have not bent it before.
Old 6th December 2012, 11:24 AM   #13
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Originally Posted by bapcha View Post
OK - Papa - I have been a member of DIY audio for a few days, but I know about you and that you are a very gracious and generous contributor to the DIY audio community, but I would (as an ex-circuit designer), like to honor two others that many here might not know about:
a. Bob Widlar (RIP)
b. Dave Fullagar
c. Paul Brokaw

Bob Widlar invented the Widlar current source that everyone uses (without thinking about it); and Dave Fullagar's 741 op-amp is still being sold in the marketplace! Every transistor, every resistor in that circuit is/was/will be GENIUS. If one can explain the 741 to someone else, that person can (with some help from our dear Papa) - design something that can be on par with Papa's best!!!!

Finally, Brokaw - who designed the bandgap reference - the reference that until today has not been (and cannot be) improved upon - unless someone comes up with something like a Higgs-Boson reference :-) :-)

So, PAPA (or someone else) tell me what it takes to design a great amplifier (not interested in "something that sounds as good as the recorded music" - more like from a circuit perspective - something like:
a. An amp that is referenced by something invariable - like a bandgap (if this is the first time someone has heard about it, count me as the primary author on the patent - or of course there is this posting);
b. An amp that perfectly reproduces the signal into any load;
...then we go about restricting things about the load.....

Bapcha Man,
Aptos, CA.
Semiconductor Marketer Extraordinaire
What about Robert Allen (Bob) Pease and Peter-James Baxandall ?
go to
Bob Pease on the New LM4562
post #71, 103 and 87 by
Baxandall Super Pair so as
Republished: Baxandall and Self on Audio Power - | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement

read also pdf attachment by post #15 about
Ultimatest Passive Tone Control Network based on James-Baxandall's topology wanted

Last edited by tiefbassuebertr; 6th December 2012 at 11:32 AM.
Old 6th December 2012, 11:38 AM   #14
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I always thought Nelson was most well known for his wrestling move, not his amps

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...Shape the sound , Man!
Old 9th December 2012, 11:17 PM   #15
a.wayne is offline a.wayne  United States
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Originally Posted by Nelson Pass View Post
These are persons who stood on the shoulders of giants.

I ride their coat tails.

Excellent grip.....
Old 10th December 2012, 01:07 AM   #16
Blues is offline Blues  United States
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Originally Posted by a.wayne View Post
Excellent grip.....
Indeed...come to think of it there's a lot of us hanging on his!
Old 10th December 2012, 08:50 PM   #17
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I started my EE degree in '95 and internet was still in diapers. Even back then NP was helping and motivating diy'ers. The A40 amp got me hooked, my self-designed amp no2 was heavily based on NP's mosfet KISS jobs.
Over the years I've found interest in early electronics (tubes) and read about countless innovators. For some reason only one is easily recollected by my aking greys: Nelson Pass. Not brown-nosing here, just saying.
Old 10th December 2012, 09:28 PM   #18
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Originally Posted by SY View Post
That's three, not two. And I doubt that anyone here is unaware of them.
Originally Posted by natural sound View Post
ask him my not 2 but, 3 questions?
May I suggest you unsubscribe one of your aliases rapido, before your sock puppet hiney receives the boot mark.
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Old 10th December 2012, 09:54 PM   #19
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