How does one determine saturation point of triode or pentode

apehead · 4th February 2008, 05:37 PM

How do you determine the point of saturation in a tube? I've never seen the current spec. in a data sheet.

Jeb-D. · 4th February 2008, 06:02 PM

I take it your mostly a solid state guy. Cutoff and saturation with tubes is more of a gradual thing than an absolute point. Except perhaps the saturation point in some Pentode applications. For most cases, the point on the load line where the grid to cathode voltage equals 0V is the pseudo "saturation". But in actuality most sources can drive the tubes grid slightly positive.

But generally when designing, draw the loadline and use the Vgc = 0V as the point of saturation.

4th February 2008, 05:37 PM	#1
apehead diyAudio Member Join Date: Oct 2006	How does one determine saturation point of triode or pentode How do you determine the point of saturation in a tube? I've never seen the current spec. in a data sheet.

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4th February 2008, 06:02 PM	#2
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	I take it your mostly a solid state guy. Cutoff and saturation with tubes is more of a gradual thing than an absolute point. Except perhaps the saturation point in some Pentode applications. For most cases, the point on the load line where the grid to cathode voltage equals 0V is the pseudo "saturation". But in actuality most sources can drive the tubes grid slightly positive. But generally when designing, draw the loadline and use the Vgc = 0V as the point of saturation.

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