ppl said,
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I am not a Tube fan and I do not believe tubes are a superior Amplifying Device however some people do and so for those that just love thermionic valves devices.
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I am not a Tube fan, either. But I still buy a SRPP+Cathode Follower design with 4-tube regulator for AB test.
I know some Tube fans don't like any solid state in the circuit, they don't want JFET-input like Audio Research LS-25 Mk-II, they say the hybrids sound "too clear ","too modern", they criticise the solid state regulator and prefer using CLC or tube regulator, maybe there are some truth but the measurement can't tell.
I have read Allen Wright's article of his SP-15, I do agree his viewpoint about shunt regulators are much better than the series regulators.
http://members.ozemail.com.au/~lisar...15_Article.pdf
Though I don't know how to test or measure the difference between them.