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In Reply to: RE: ping deathtube 667 re: starved filaments posted by Tre' on April 10, 2014 at 17:28:12
Take a constant current load at 2ma and look at which has more uniformly spaced lines. this represents amplification.
now look at the slope of each line at 2ma and this is the Rp. Again which set of curves have the least amount of variation.
since Gm-Rp/mu, the more consistent Rp and mu remain the more consistent Gm will be.
Of course you do need to pay attention to where you operate things since you now have to avoid a "knee" at both low and high current but it can be easily seen that the starved tube is more linear.
dave
Follow Ups:
I think I see this.So starved filaments aside,
As I look at some triode plate curves, lower plate voltage and higher current (in many instances) gets us both linear gain and a more constant Rp which will equate to less distortion.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 04/11/14
I reduced the value of the cathode resistor on my CCS loaded 5687 driver.
That lowered the plate voltage and places my P-P swing in a more linear (Rp) place.
It sounds great but then it sounded great before.
I'll have to listen some more.
Thanks again.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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