Audio and Video Talk > Valves / Vacuum Tubes

Push-pull, Class A/B (and/or B) VALVE/TUBE Amplifier - Discussion

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Hi-Phibian:
I would say that a line stage is the place to start. Plenty circuits everywhere for power amps but available trannies dictate design/build choice more then preferred circuit layout for most DIYers I would assume.

Ampdog:

--- Quote from: Shonver on May 23, 2009, 09:12:32 AM ---Bit early for a papsak, hey?

--- End quote ---

Well, I do declare......

Here is a man, not only reading my post at all but even in great detail (for which I am gratified), and furthermore, most singularly, finds for the slight slip a reason of grand culture, instead of as most of the male examples of the species might have done, in the sexual abarration contained therein.

Unique indeed ....

Ampdog:

--- Quote from: ghostinthemachine on May 23, 2009, 09:56:42 AM ---Mmmm... sometimes it feels like I am seeking "The Philosophers Stone" ........  I just thought we can get a casual discussion going (mostly in layman's terms) on what the function is of the basic parts in tube amplifiers.
--- End quote ---

I think the main reason for such a sensation is that one has not started from the beginning. One would first have to comfortably understand how basic components operate, beginning with what a thermionic tube is, then how it is made to 'amplify' electricity using resistors and capacitors and what each of the latter two is doing/not doing. The fatal temptation in amplifier design (of which hi-fi amplification is a smaller specialist field) is to do the 'tweaks' before the basics are understood. (The classic tragic example of what can happen is the bad name 'earned' by NFB, because a certain lazy brigade started off at the end, leaving them floundering in misconceptions as they vainly tried to 'patch up' poor designs with layers of NFB.)   

From Hi-Phibian

--- Quote --- I would say that a line stage is the place to start. Plenty circuits everywhere for power amps but available trannies dictate design/build choice more then preferred circuit layout for most DIYers I would assume.
--- End quote ---

I sense that this is different from what Gostinmac wanted; perhaps following on that - function of components before application to particular stages. (That is how I read his "basic parts of tube amplifiers" - components, not functional stages.) The function of a stage does not really depend on whether 'glass/sand' is used. Available transistors are fortunately more than enough not to limit audio design among themselves. But then I take it that the thread title mercifully rules out dealing with the vagaries of those little three-legged bugs!

For the former purpose (function of ...) something at least as complete as the first seven pages of the RCA TUBE MANUAL is required - can that be off-loaded only? The author of this thread will have to point out what he wants, and one must point out again that such a tutorial is going to be bulky, with many diagrams.

The purpose should not be to make physicists of DIY'ers, still the pitfall mentioned in the beginning should be observed.  "Ag, we don't need to know all that; we only want to design something like a Leak or a Mullard 5-20". ...... yah, sure: "Welcome, said the spider to the fly."

As Hi-Phibian said, many circuits exist (also poor ones) - do we start off with some off them and explain at the hand of which what each part is doing, or does one start as per RCA TUBE MANUAL's beginning or similar?

ghostinthemachine:
Okay... I sense a bit of "fear" in the air. Some might think this thread is going the same route as that other one that caused such a moerse commotion a few months back (me and an oscillator circuit for a turntable motor...) - well that is not my intention here.

I just merely want to "get the news out there" that a tube circuit is not that difficult to understand. I'll try and post my broken ideas on how it works (in accordance to what I read in the technical manuals).

ghostinthemachine:
Okay, lets get things straight.

Who would like to see a description of how a vacuum tube amplifier works?

I ask this before I go, like a fool and post a long possibly boring, possibly senseless post of ideas.


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