Several 2N3904 and 2N3906 in a standard differential gain stage setup with negative feedback.
From a one-dimensional graph, there truely isn't anything to go on, much less solve for a hundreds-of-dimensions circuit with an undefined number of stages and branches. Even a single stage amplifier can have significant shunt and series feedback, reducing distortion of even 12AU7 to negligible levels.
Sooo, whatever it is you're trying to tease about, try to keep in mind that telepathy doesn't actually work. 😉
Tim
From a one-dimensional graph, there truely isn't anything to go on, much less solve for a hundreds-of-dimensions circuit with an undefined number of stages and branches. Even a single stage amplifier can have significant shunt and series feedback, reducing distortion of even 12AU7 to negligible levels.
Sooo, whatever it is you're trying to tease about, try to keep in mind that telepathy doesn't actually work. 😉
Tim
Tim, very creative! But there really aren't many tubes that will give a distortion spectrum this clean, no matter what the operating point.
So far, nothing correct. One person has come vaguely close, though. I'll pull back the curtain this afternoon.
So far, nothing correct. One person has come vaguely close, though. I'll pull back the curtain this afternoon.
We've had an ecc88, so as I really no nothing about tubes I'll take a wild guess of an EL84 in triode mode..
I'm guessing it's not a big tube anyway due to the lowish voltage quoted.
I'm guessing it's not a big tube anyway due to the lowish voltage quoted.
Hmm....
Last time I saw a question like this, it turned out to be a power FET.
Then again, if SY had touched silicon, he'd be having a "Don't look at me, I feel dirty" moment.
Last time I saw a question like this, it turned out to be a power FET.
Then again, if SY had touched silicon, he'd be having a "Don't look at me, I feel dirty" moment.
You know, there's an entire CLASS of tubes that no one has guessed yet. I don't use them in my designs, but I have some on hand.
And yes, it's a tube.
And yes, it's a tube.
Hmmm, do DHTs have a reputation for low distortion and a near-absence of odd order and high order harmonics?
Triode strapped directly heated pentode of some sort?
But not the 307A.
I think they did a 306A as well, so I'll take a punt at that.
But not the 307A.
I think they did a 306A as well, so I'll take a punt at that.
This is like one of those "detective" games where little clues keep turning up. Two more clues:
Entire CLASS of tubes that no one has guessed yet:
OK there have been multiple guesses that are triodes and pentodes, so it isn't one of these.
One person has come vaguely close:
Consider the one off guesses. One of them starts the dim glow "Whatever it is, its a beam power tube strapped as a triode." OK we have the words "beam" and "power tube". The light bulb gets brighter.
What is not a triode or pentode and incorporates one of more words from one of the one off guesses. Which tube did I decide to use for the input tube in my Pete Millett "red board" because its distortion was virtually zero?
How about a "beam Hexode"? I am using the 6GU5. There is another one but i can't remember the number right now.
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