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In Reply to: Thanks for the correction posted by Goober58 on October 11, 2014 at 08:42:21:
"Probably a bit brief for this conversation as instability can be a function of design."
The instability may be by (defective) design. When I was a teenager I helped my uncle tweak his Dyna 35 watt amplifier. We didn't like the sound and built a scope, audio analyzer, signal generator, VTVM, etc. to measure what was going on. Eventually, we figured out that the square wave response was ugly and that there were a few resistors and capacitors in the feedback circuit that affected the square wave. By trial and error, we tweaked the parts to get a nice looking square wave into a resistor based dummy load. We then connected the amplifier to the Tannoy, hoping to get good sound. It was not to be, as the plates in the output tubes started to glow red. Fortunately, we didn't melt or smoke anything.
This was my introduction to system stability in the 1950's. At the time I didn't know any calculus, let alone poles and zeros, etc... I was just a kid and my uncle was an artist, art professor and textile designer. Eventually we got that amplifier running stable and measuring and sounding good, but it was all by trial and error.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Thanks for the correction - Tony Lauck 10/11/1409:18:46 10/11/14 (1)
- Nice story Tony - Goober58 10:32:21 10/11/14 (0)
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