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In Reply to: RE: Ultimately... posted by aknaydenov on October 05, 2015 at 10:48:54
"One of the reasons I started building my own cables is to be sure they won't have wrong with directions."
It's interesting to me that you are concerned about the direction of wire but you use triode wired pentodes that are clearly not as linear as true triodes.
In my mind we should take care of everything that is clearly understood before we move on to the other things.
Just saying.....
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Judging from my personal experience, cable distortion is audibly different from tube distortion and one doesn't entirely mask or compensate the other.
Despite this, on paper 6P45S wired in triode is very, very linear and rivals many triode. Please "google" its curves and check it out.
Have you got a set of curves better than this? This is all I could find.
"Despite this, on paper 6P45S wired in triode is very, very linear and rivals many triode. Please "google" its curves and check it out."
The spacing gets wider to the left and narrower to the right.
The plate voltage changes 200 volts in one direction but it only changes 160 volts in the other direction for the same grid change. That will cause a lot of harmonic distortion.
That is not "very, very linear". It's not even close to what I would call linear.
A 45 is very, very linear. A 2a3 is very, very linear. Hell, even a 300b is very, very linear compared to what you have.
Linear is when the plate voltage changes the same amount, left vs. right following the load line, as the grid voltage is changed from the idle point.
Sorry, maybe you have a better looking set of curves.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yes, my mistake.
It can be considered linear only in a narrow region, swinging 39V RMS.
This translates into ~0,6W RMS output, which is enough for me to listen to a wire's direction.
Yes, you are right.39 VRMS is about 55 volts peak. 110 volts peak to peak. The tube is quite linear for that portion but becomes non-linear beyond that.
What speakers do you use?
.6 watts can be plenty, depending on the speakers, to listen to music not just wire direction.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/06/15
Currently the amplifier is wired to these sepakers:
https://www.youtube.com/watch?v=JaV4e9ikNgs
My speakers are about 97db for one watt. Because of the gain structure of my system I can only get 2 watts from my 300b amplifiers. I only play midrange and treble with my tube amplifiers crossing to a SS amp at 200Hz into a pair of JBL 2231's.
That gives me a peak volume (assuming I'm in the reverberant sound field and I am) of 103db. This means if the peak over average range of the music I listen to is 16db, I can listen at 87db average.
Your speakers are 95db for 2 watts. That's 92db one watt. So with two speakers and .6 watts per speaker that's just a little over 92db peak total.
Listening to the same music as me, your average listening level (while not clipping the peaks) would be just a little over 76db.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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