Grounded Cathode phase?

regal · 28th August 2008, 02:03 PM

What is the phase of an output taken from the plate of a grounded cathode? Is it inverting or normal polarity ?

SY · 28th August 2008, 02:15 PM

Inverting.

As a signal goes positive, the grid goes more positive (less negative) with respect to the cathode. So the tube conducts more. If the tube is conducting more, it draws more current, the plate resistor drops more, and the plate voltage goes more negative (less positive).

hth

Yvesm · 28th August 2008, 02:57 PM

The more I go faster, the less I go slower

And vice et versa.

Yves.

28th August 2008, 02:03 PM	#1
regal diyAudio Member Join Date: Jan 2004 Location: MD	Grounded Cathode phase? What is the phase of an output taken from the plate of a grounded cathode? Is it inverting or normal polarity ?

28th August 2008, 02:15 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Inverting. As a signal goes positive, the grid goes more positive (less negative) with respect to the cathode. So the tube conducts more. If the tube is conducting more, it draws more current, the plate resistor drops more, and the plate voltage goes more negative (less positive). hth __________________ If there's a sucker born every minute, where do the rest of them come from?

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28th August 2008, 02:57 PM	#3
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	The more I go faster, the less I go slower And vice et versa. Yves.