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Originally Posted by Cygnus X1
Odd thing is-with every different build, there is a different tone. No two are the same. Some have described this as "lead dress". Where the layout of the wiring has its own inductance/cap/resistance values.
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This is a common phenomena. Hand wired amps, even ones that have the exact same circuit, components, etc, never sound alike. It is because of the factors you describe, the parasitic capacitances, inductances, etc. I have a hand wired tube amp and it sounds kick ass, but it also receives the radio. This is a recent development though, it didn't do this when I first got it. You can sometimes make parasitic diodes to create a primitive form of radio receiver in these things. One thing you can do is use PCB design - you get the same thing every time, and there is a lot to be said for this. You can also get computer programs that will analyze your PCB layout and calculate the parasitics for use in a simulator program, so you can model everything before building. I don't know if anyone does this, I would imagine that most tube amp builders do not, but I don't really have any professional knowledge.
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Sometimes small changes multiply.
Having an EE background is a great resource!
Unfortunately, I don't have that-but I do have enough ME experience to do math and extrapolate what is what.
Knowing how to read a schem and tweaking gives enough info to go with. Patience, my student...patience.
We are not the designers, after all.
We are simply playing with what has already been done.
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It seems like using a computer circuit simulator would be helpful to do this. :google interlude: Here it is:
http://www.normankoren.com/Audio/Tub...e_article.html
Tube Spice models! Yes, I am a geek. We also use Spice where I work, its a very useful program and works very well for amp design applications.
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