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In Reply to: Re: guru posted by Buzzman on March 8, 2007 at 13:30:07:
Buzz, I understand your point -- that if someone changes their view and says so, that is entitled to a little respect. Drlowmu cannot be faulted for lack of interest in finding sonic nirvana, and he has certainly stimulated discussion.But -- and I don't want to speak for Tre' or others -- I think the harsh reaction comes from the fierceness with which Drlowmu presented his views in the past -- views which he just recanted because his own guru said something different.
Here is a post that shows what I am talking about:
Quoting Drlowmu:"Hello,
Only the HV secondary DCR matters. Bad news : 252 ohms DCR I must inform you, positively stinks, such high DCR is not accceptable for audio, guarantees NOT GOOD sound in a no NFB triode amp !! Buy a T amp!!
Even a crummy ST-70, which runs super warm to the touch, or likewise, a Dyna MK III power trannie has about 80 ohms DCR.
On Power transformers, FROM ALL MY LISTENIING EXPERIMENTS OVER 30 YEARS:Eighty ohms is LOW FI.
Forty ohms is just MID FI.
Twenty ohms is good HI FI.
Under Ten ohms is ULTRA HI FI.There you have it. About the same DCR parameters apply to inductors BTW.
No need to build your house on a weak foundation.
You can't get quality from left over TV parts. Don't mean to be hard on you.Jeff Medwin"
Now, in fairness, low DCR to some extent goes with higher current capability. But, this does not hold up when making subtle distinctions below 100 ohms of secondary DCR. I have some honkin' power transformers with 50 ohm DCR secondaries rated at 310-0-310 and 500mA -- before this recent channelling from Dennis, I was under the impression that the transformers were not even mid-fi.
Most folks are like me -- they would never ever post something saying some other person's system or parts do not or cannot sound good, without hearing it. If one does not live by that rule, he or she must expect a little grief when abandoning the underlying rationale for making such bold assertions. And, when claiming to know something based on "LISTENING EXPERIMENTS", only to say "Never mind . . ." based on an email from a guru, seems a bit contradictory as well.
Let me be clear -- while other topics are worthy of the kind of focus low DCR has gotten, I think the forum and hobbyists have benefitted from the discussion, driven by Drlowmu's embrace and advocacy of particular ideas. A lively forum keeps us coming back.
My beef is with pronouncing things "mid-fi" or "low-fi."
Steve Root
Follow Ups:
Steve,You say:
" views which he just recanted because his own guru said something different. "
I don't think so at all !!
I recanted MAINLY because I just built and heard the Low C, Low HY, Low DCR supply on Greg's 245 amp - only several weeks ago, I trusted what I heard enough to bring it all up publically here on the 'ole Forum, so others may consider employing it in their amps, and gain the benefit.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
is starting to unravel the emotional from the intended message. So much of these 'discussions' is a reaction to the way J & D presentation of their findings, their arbitrary categorisations, and it seems (now) to me their insistence on absolutes. Perhaps they should remember this is only an hypothesis, not yet theory nor reproduced with consistency in practice. Maybe their excitement over their discoveries and desire to share gets in the way of their moderation and use of more appropriate language?That said, they encouoraged people to try it out for themselves - somewhat at adds with their claims of absolutes. Can be expensive for DIYers tho - all those TX, Lundahl chokes, 'n' stuff. At least the latest hypothesis is not so costly.
Oh dang, where did my stolen Buzzman persona go? Word. Ah, there it is.
Hey Buzz,'Not really just a hypothesis, Dennis' Serious Stereo SE 2A3 amp has been designed and replicated by him since 1992. Circuit hasn't changed any. It was and still is Low C, Low HY and Low DCR !!
as to what is tried and tested over time and what is been tired just once. And whether the specific formula has changed or not.Oh yeah, if you have just a general description / understanding of why something works, you want people to experiment, and seek to refine the formula etc. it is an hypothesis.
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