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In Reply to: RE: If not the Carbon Comp grid stoppers for oscillation then... posted by Chip647 on July 24, 2016 at 06:31:30
I am using EICO HF 87 output trannys and i did not want to fuss with doing the added parts for the G2 supply. regards, Dak
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I have always felt that term doesn't belong in audio as I don't feel equates even tho so many people use the term.If you are talking about the musical notes straining,that might be considered sibilance I suppose.Anyway,if this is a PP version of the amp we were talking about a few weeks back,you need to look at your square wave at 1khz and then 10khz just for purity.If it can't produce a 1khz sq wave without ringing,we will have to find out why.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/24/16
J Gordan Holt "sibilance; A coloration that resembles or exaggerates the vocal s-sound."
I believe if we all adopt JGH's glossary we could communicate better.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
The strained sound Michael is discussing is probably better described as "stridence." That's very different from sibilance. Anyone who wants to know what sibilance sounds like need only find a pentode amp and remove the NFB. It will be immediately obvious what sound we are discussing here. :)
--------------------------
Buy Chinese. Bury freedom.
Yes, the amp is the one, i think. PP class A amp with fixed bias.
The amp seems to exaggerate the f,s, and t sounds. With some recordings showing more of that tendency. But, i believe that some of that is less now that the amp has more hours on it.
The sibilance was most pronounced on "The Pentangle, Basket of Light". With Jacqui MacShee? vocals had a real obvious exageration on f's and s's.
Now that the amp has played for almost 20 hours it is not as bad. I have been playing it today for almost 8 hours and i played that Pentangle cd again. The track is called Lyke-Wake Dirge. It is mostly male and female vocals recorded live. I think the recording has exaggerated the esses in consonants. Some of the other tracks with the same vocalists are not as "hot" sounding.
Perhaps, i am being too picky, but other than this, the amp sounds very good indeed. cheers, Dak
PS, perhaps, it is a testament to that amp that the recording's deficiencies, has been laid bare so obviously.
Edits: 07/24/16
I would use paper in oil coupling caps because when there is DC voltage on the cap,paper in oil caps maintain linenerity with frequency change.I still would look at a 1khz sq wave and see what the final product looks like as that can tell you a lot.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Hi Mikey, i am using PIO coupling caps. Do you think i should bail on the Vishays? regards, Dak
i should bail on the Vishays? regards, Dak
If you are using them as grid to ground in high stages,they are great.I use them in preamps but if you using them as plate,cathode,or grid stoppers,they aren't the best bet in that scenario.There are many Vishays tho,I speak of the RN65 or any metal film.
Are you able to run a 1khz sq wave thru the amp to see what it looks like?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/24/16
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