Book suggestions for class AB and B theory and design

[macwanj]

Hi folks,

I am looking for books/articles that cover the design of class AB and B tube amplifier topologies. I recently read Morgan Jones' Valve Amplifiers but it does not cover class AB and B topologies in detail.

I am specifically looking for things like:
- choosing the operating point for class AB and B operation and how exactly the operation point determines the class of operation
- large and small signal analysis including the calculation to voltage gain, the effects of bypassing cathode/plate resistors etc

Somebody suggested Principles Of Power by Kevin O'Connor; does this book cover all of the above in detail?

Any help would be appreciated.

Happy Holidays everyone!

[barr]

enjoy yourselves!

http://www.pmillett.com/technical_books_online.htm

[Chuck_Farlee]

These files might be of help:

http://www.audioxpress.com/resource/...lass/index.htm

chuck

Hi folks,

I am looking for books/articles that cover the design of class AB and B tube amplifier topologies. I recently read Morgan Jones' Valve Amplifiers but it does not cover class AB and B topologies in detail.

I am specifically looking for things like:
- choosing the operating point for class AB and B operation and how exactly the operation point determines the class of operation
- large and small signal analysis including the calculation to voltage gain, the effects of bypassing cathode/plate resistors etc

Somebody suggested Principles Of Power by Kevin O'Connor; does this book cover all of the above in detail?

Any help would be appreciated.

Happy Holidays everyone!

[Old Tele man]

+1 on the Crowhurst articles!

...but, I have to ask, do you (a) want to just "understand" how they work; or, (b) learn "how to" design such amps?

[macwanj]

Hi Old Tele man, I want to understand the theory so that I may more importantly design them. I've already gone through pmillett's site and I really liked Norman Crowhurst's books. The RDH seemed a bit too math heavy for me. Things that I would like to know what are:

1. What are composite loadlines/ how do we use them?
2. Where to set the operating point for class B push pull as well as class AB?
3. The significance of the screen grid in a pentode's power output.

Stuff like thi that will help me design my one stuff. I've been building single ended low power amps for the hi-fi community for a while but when it comes to push pull class B and AB I'm really a beginner

[Old Tele man]

Things that I would like to know what are:

1. What are composite loadlines/ how do we use them?
2. Where to set the operating point for class B push pull as well as class AB?
3. The significance of the screen grid in a pentode's power output.

...composite loadlines are just two Eb-Ib plate curves arranged together backwards and upside down, with the "combination" push-pull operation of BOTH tubes actually creating a new "composite" operating line that is NOT that same as either curve (it's their ±combination)...two excellent sources of information are: (A) Steve Bench's website and articles on this subject; and (B) Albert Preisman's book: "Graphical Constructions for Vacuum TUbe Circuits," 1943, McGraw-Hill (check your local library).

...Class-B push-pull is exactly at 180-degrees conduction angle while Class AB is typically about 200-degrees (for more info see my article on this subject on the PENTODE PRESS website). Point of interest: Class-B operation can NEVER use cathode-bias while Class-AB can (think about it).

...in tetrode and pentode tubes, the screen grid (g2) is *THE* accelerating element, that is, it actually establishes and controls the output power the tube can deliver from a given input...it is the "surrogate" plate, with the real plate only acting as the "electron catcher" (think baseball catcher analogy here)...and, this is especially true with beam power tubes and other tubes where the screen grid is physically wound/positioned in the "electrical shadow" of the control grid (g1)...also called "aligned-grid" arrangement.