Tube DIY Asylum

RE: Have you figured out your scope yet?

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This Post Has Been Edited by the Author

In Reply to: RE: Have you figured out your scope yet? posted by TomWh on March 22, 2017 at 13:44:06

"why does a tube sound different than a transistor?"

Because their transfer functions are different.

"Why do different tubes sound different?

Because their transfer functions are different.

"We can pick something as simple as a 300b vs 2a3. Do the numbers on what ever machine show what it is going to sound like???"

Using a volt meter and having the knowledge of the load impedance, knowing the idle current....to a large degree, yes.

"Is there a machine that can tell how a how a 845 will sound like with the b+ at 450volts vs 1200 volts. Or 50 ma vs 100 ma idle current."

Knowing that and the slope of the load line, to a large degree, yes.

But it's not a machine, it's knowing the operating condition (voltage current, load line) and having a knowledge of audio electronics.

It's truly amazing how much the math will tell you about an amplifier and how it will perform and (with some experience) how it will sound.

Published plate curves are really pretty accurate so the harmonic distortion can be predicted.

With a curve tracer one can trace the curves for the exact tube he intends to use and build/tweak the circuit around that knowledge, basically make it do whatever you want it to do.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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