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mosfet50
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Last seen: 12 months 1 day ago
Joined: Nov 6 2011 - 8:12am
Mr. Misnomer

Please, this is getting painful. Someone tell Sam Tellig that there is really no such thing as a passive preamplifier. I don't care if someone in the 60's said it or a caveman said it. JA is 100% right.

Now ST is saying that a passive device can have gain. What? No it can't, please give this poor man a high school physics book.

And Sam, the theoretical speed of electrons through a wire is..... guess what? The speed of light, so an attenuator that calls itself "Light speed"? I have a lamp cord that works at light speed too.

I'll give you that you can hear the difference between two sources when both are batteries if it makes you happy but I have strong doubts about that too.

Someone come in and save this guy!

Mosfet50

John Atkinson
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Joined: Nov 7 2010 - 3:31pm
Getting painful?

mosfet50 wrote:
Now ST is saying that a passive device can have gain. What? No it can't, please give this poor man a high school physics book.

Sam was referring to a transformer-based device, which can indeed have voltage gain, though this is at the expense of the current flowing in the secondary winding.

mosfet50 wrote:
And Sam, the theoretical speed of electrons through a wire is..... guess what? The speed of light...

Well, no. The electrical _signal_ does indeed travel at the speed of light, but only when the conductor is surrounded by a vacuum. When the conductor is surrounded by an insulating material, the signal slows down to (still sizable) fraction of the speed of light, depending on that material. But this is the speed of the _signal_, which travels _outside_ the conductor; the conducting electrons that support that signal move a few inches per second, and with an AC signal merely oscillate around their rest positions.

See my essay at www.stereophile.com/asweseeit/84/index.html, specifically the text at the foot of the first page.

John Atkinson
Editor, Stereophile

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