cathode amp

costiss · 10th March 2003, 10:49 AM

who do you graphically take the performance in a common anode amplifier? (no Ra, signal taken from cathode) thanks

EC8010 · 10th March 2003, 01:54 PM

Draw loadlines as if you were taking the output from the anode, then apply 100% negative feedback by moving the load resistor into the cathode circuit.

djmiddelkoop · 10th March 2003, 08:47 PM

You can use the Ia/Vgk graphics.

But the CA gets more linearity when loaded with a current source.
When the voltage between anode and cathode is held constant too, the linearity is even more improved

Check the www.vacuumstate.com site for examples

Brett · 11th March 2003, 02:10 AM

Quote:

Originally posted by djmiddelkoop
You can use the Ia/Vgk graphics.

But the CA gets more linearity when loaded with a current source.
When the voltage between anode and cathode is held constant too, the linearity is even more improved

Check the www.vacuumstate.com site for examples

Agreed.
From my experience of building both the hybrid and all tube FVP5 linestages (though mine were differential), this one sounds the best. I haven't tried the RTP3C linestage.
http://www.vacuumstate.com/images/FVP5A.gif

10th March 2003, 10:49 AM	#1
costiss diyAudio Member Join Date: Dec 2002 Location: greece	cathode amp who do you graphically take the performance in a common anode amplifier? (no Ra, signal taken from cathode) thanks __________________ i am currently using 60,000 uF of capacitance in my preamplifier..

10th March 2003, 01:54 PM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Draw loadlines as if you were taking the output from the anode, then apply 100% negative feedback by moving the load resistor into the cathode circuit. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

10th March 2003, 08:47 PM	#3
djmiddelkoop diyAudio Member Join Date: Feb 2003 Location: Noord-Holland	You can use the Ia/Vgk graphics. But the CA gets more linearity when loaded with a current source. When the voltage between anode and cathode is held constant too, the linearity is even more improved Check the www.vacuumstate.com site for examples __________________ Music is the best F.Z.

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