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In Reply to: How Big emitter resistenses posted by groman on January 8, 2002 at 04:30:45:
Hi Groman,I wondered about exactly the same point. He puts great emphasis on the voltage. Of course, smaller resistors mean higher current. In conventional terms this means more of an AB operation point as conventional wisdom looks at the quiscient current in comparison to the load current.
On the other hand, I always thought large emitter resistors help because they help to replace the small nonlinear emitter resitance of the transistors with a larger, but more linear resistance. And they make thermal stability much better!
I am a firm believer in that audible differences must be linked to shortcomings of the circuit. As such, they should be measureable, but for my taste, Mr. Self is a little nonchalant in looking only at THD generate from single sines.
Not having a beautiful AP-1 analyzer myself, I have to rely on my ears a lot, and on primitive, but powerful tests like looking at the output of a square wave into some very low impendance complex load (e.g. 100 nF or 0.1 Ohms). Maybe I will buy a GOOD sound card, my current one being pretty dirty, but I haven't yet found a good audio analysis software.Last not least, being a physicist, I like to understand circuit phenomena from a theoretical standpoint. Theory and listening tests are as least as important as measurements.
Greetings,
Eric
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Follow Ups
- Re: How Big emitter resistenses - capslock 01:53:37 01/09/02 (1)
- Thanks Eric - groman 07:58:23 01/09/02 (0)
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