77.43.10.3
I have designed, built and tested several tube amplifiers (from 4W to 40W, OTL, PP, for hi-fi and guitar, all with global feedback applied over 2 or 3 stages).
In my experience I have always found that some global moderate feedback helps to get the best overall performance of a tube amplifier (I mean with the particular speakers that I use in my listening room) and to stabilize performance against components ageing.
However I see in the asylum that there are different opinions about the use of negative feedback.
Many inmates are quite strongly convinced that the quest for zero feedback is a must for every serious audiophile.
This is the reason why I propose this call for the survey of the opinions (and or the experimental findings) of all the interested inmates.
A speculative byproduct of this survey might also be the definition of some novel measurement technique able to better correlate laboratory measurements with the results of live listening sessions.
ecc230
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