• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Amp Circuits Tutorial

Circuit types I have heard of include:

Small Signal Amplifier Circuits:
Cascode
Cascade
Grounded Grid
Common Cathode
Grounded Cathode
Shunt Resistor Push Pull
Differential
 
Impedance Buffers:
Cathode Follower
White Cathode Follower
 
Phase Inverters:
Long-Tailed Pair
Cathodyne
 
Power Amplifier Circuits:
Loftin-White
Direct Reactance Drive
Brooks
Williamson

Presumably there are others. Circlotron, Constant Current Source, I have heard named, but I do not know in what category they belong.
 
Could someone make a brief (or not brief) statement about one or another of these, telling why a designer might choose it instead of some other circuit. Tell what advantages and disadvantages the circuit has, tell what it is intended to accomplish. Tell anything else it amuses you to tell about it.

I can read this or that statement about some of these by doing an internet search for each, but in those pages which ever circuit is being mentioned, it is usually being considered in isolation, and with the designer telling only a little of why he used it. It is the comparison to other circuits which would, I think, aid my understanding.
And I believe it would be enlightening to have the descriptions and insights from multiple users collected all in one place.
 
Thank you
Brian
 
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It is normally good practice when joining a new website to read what it already says, rather than demanding that people provide personal tuition.

Curiously, it seems common for new members to want to start a tutorial thread. I suppose we should be grateful for this, as another all too common phenomenon is for a newbie to attempt to write a tutorial!
 
What worked for me so far is start with one topology and learn it possibly building the circuit as well. Learn simulation software this will also help analyze a circuit. Do this for every circuit you mention and then you can see for yourself the pros and con's of each topology.

If you have questions this forum is where to turn to. There are some really bright minds here that will explain the more advanced theory of said circuits.

If you don't know the basics theory about passive components start there. I tried to run before walking and it doesn't work that way.
 
It is normally good practice when joining a new website to read what it already says, rather than demanding that people provide personal tuition.

It was not a demand, it was a request.

I did the usual searches at this site and did not find what I was seeking.

If the members of this site do not want a tutorial published here, it is of course your site. Do what you will. I thought this site would be a good place to find the instruction I am seeking as I was not finding knowledgable designers on the two other forums I frequent. That is why I asked for the information.

Brian
 
You can find most of what you seek in a good book. Look for Merlin Blencowe or Morgan Jones. When you get puzzled by what you read come and ask. We (including the authors) will be happy to answer your questions.

However, you need to realise that in order to appreciate particular circuit blocks you need to understand circuits more generally. For example, knowing what the output impedance is of each circuit won't help you very much unless you know what is meant by output impedance and why it matters.

If you already have the necessary background knowledge then most of your questions can be answered by using the search facility. Most of the circuits you mention have been discussed and debated on here at great length.
 

20to20

Member
2010-06-23 9:25 pm
It was not a demand, it was a request.

I did the usual searches at this site and did not find what I was seeking.

If the members of this site do not want a tutorial published here, it is of course your site. Do what you will. I thought this site would be a good place to find the instruction I am seeking as I was not finding knowledgable designers on the two other forums I frequent. That is why I asked for the information.

Brian

You really have a lot of misplaced trust in the internet. ...with all do respect. Like a log in a flash flood, finds itself buried in mud sometimes instead of floating on a scenic ride. There was a poster not long ago who attached a photo of all the "parts" he had collected for cheap and wanted the forum members to identify them all and give him guidance on building the "thing" he had in mind. It was sad, his dreams were shattered,,, his parts were a total waste of his money and time to collect....