Threshold Stasis-3 - Class A or not - diyAudio
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Old 11th December 2016, 03:31 AM   #1
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Default 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?
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Old 11th December 2016, 12:24 PM   #2
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is it hot ?
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Old 11th December 2016, 01:51 PM   #3
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Quote:
Originally Posted by Zen Mod View Post
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.
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Old 11th December 2016, 03:31 PM   #4
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answer is in related brochures

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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File Type: jpg stasis2-3schem.jpg (114.1 KB, 102 views)
Attached Files
File Type: pdf thresholdadjust.pdf (199.1 KB, 16 views)
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Old 11th December 2016, 05:40 PM   #5
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I recall the bias setting as falling under A/AB.
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Old 11th December 2016, 05:53 PM   #6
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The debate is settled then. Thank you so much for your replies!
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