Threshold Stasis-3 - Class A or not - diyAudio
 Threshold Stasis-3 - Class A or not
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 11th December 2016, 03:31 AM #1 diyAudio Member     Join Date: Aug 2007 Threshold Stasis-3 - Class A or not Hi, I have what should be a very simple question to answer...was the Threshold Stasis 3 a class A amplifier or not?
 11th December 2016, 12:24 PM #2 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain is it hot ? __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
diyAudio Member

Join Date: Aug 2007
Quote:
 Originally Posted by Zen Mod is it hot ?
Nope.

I don't think it the amp is Class A, but my friend who owns the amp has the understanding that it is. We've also read that it's 100 or 125 watts a side, and can't see any way an amp that size could produce that kind of power in class A, but I was hoping for a definitive answer here.

diyAudio Member

Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain

however , Papa can tell you how much it can be biased and what amount of A class you can expect then

OK , that last part anyone can calculate .......

from files enclosed , I can calculate that Iq for Stasis 3 is 3x(75mV/0R68) =around 330mA

so say that we can expect twice that while all output critters are conducting (condition for A class) so 660mA

from P=I^2 x R , for 8R load , that would be 3W5 of pure class A , while rest is AB

entire calculus - counting on fact that current envelope is determining A class region , while voltage aenvelope (rails) are more than sufficient , being determined for AB class amp

conclusion - crank it , to 50C at heatsink , measure what you have across emiter resistors , then calculate what you have ......
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my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

 11th December 2016, 05:40 PM #5 The one and only     Join Date: Mar 2001 I recall the bias setting as falling under A/AB.
 11th December 2016, 05:53 PM #6 diyAudio Member     Join Date: Aug 2007 The debate is settled then. Thank you so much for your replies!

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