Hi Zen Mode and Diyers
FC what is it ferrite core ?
Thanks for clarification.
Oops i see open baffle photo with Lowthers at BAF
is PM6A silver wire voice coil, ticonal magnet ?
Anyway this " jewelry " wide range speakers are not 88 dB.
Sony Vfet CSX play great with high efficiency stuff no doubt.
Field Coil (electro magnetic with variable Q according to the applied voltage and the current flow)
In the BA 2013 presentation Mr. Pass says "you can unbalance it without a lot of trouble and generate a 2nd harmonic pretty easily".
Is it something with the wiring of the input transformers or adding source degeneration resistors?
The low and high frequency distortion exhibited by the transformers, is this something that can be ameliorated with 80% nickel? Or would 50/80% (Jensen and Intact Audio respectively) be pretty much negligible?
Is it something with the wiring of the input transformers or adding source degeneration resistors?
The low and high frequency distortion exhibited by the transformers, is this something that can be ameliorated with 80% nickel? Or would 50/80% (Jensen and Intact Audio respectively) be pretty much negligible?
Curious if there are more people finished with their build, and are listening to it?
I'd like to hear your opinions of this strange little amp🙂
Also very curious if the mighty ZM is going to build it..... I know he got some key components, love to see his build 😀
I'd like to hear your opinions of this strange little amp🙂
Also very curious if the mighty ZM is going to build it..... I know he got some key components, love to see his build 😀
being a gift , I must build it
damn , so many gifts , so little time ......... not speaking of fact that I'm in serous problem - not having enough room for that number of systems
damn , so many gifts , so little time ......... not speaking of fact that I'm in serous problem - not having enough room for that number of systems
you shouldn´t have made it public……that some gift was coming,
in this case the parts could have slept until…….
In the year 5555
Your arms hangin' limp at your sides
Your legs got nothin' to do
Some machine's doin' that for you
the SITs are still more valuable at that time……..
😀😀
in this case the parts could have slept until…….
In the year 5555
Your arms hangin' limp at your sides
Your legs got nothin' to do
Some machine's doin' that for you
the SITs are still more valuable at that time……..
😀😀
No….i only made a first try with much hum some moths ago not knowing the demands for the PSU…...sorry,
and
my bigger case is full of a kind of F4 and an UGS input stage and in my smaller case I try to make a L´Amp with the R100 CCS Mike R suggested, but with an 2SK180.
This absorbs me at the moment…. with some help of Zen Mod I occupy first time really the "load line" and how to calculate PSU voltage for a wanted output wattage and seeking the sweet point that seems to hide often from me….
So the article from Semisouthfan is coming at the right time…. 🙂
But all in all, very interesting hours…….
and the need of two main PSU and two small ones is counterproductive for my start.
and
my bigger case is full of a kind of F4 and an UGS input stage and in my smaller case I try to make a L´Amp with the R100 CCS Mike R suggested, but with an 2SK180.
This absorbs me at the moment…. with some help of Zen Mod I occupy first time really the "load line" and how to calculate PSU voltage for a wanted output wattage and seeking the sweet point that seems to hide often from me….
So the article from Semisouthfan is coming at the right time…. 🙂
But all in all, very interesting hours…….
and the need of two main PSU and two small ones is counterproductive for my start.
Hello WalterW. Please insert a 4 Ohm non-inductive power resistor between each power output of your stereo F5 amp and loudspeakers to compare with CSX1; which has an inherent 4 Ohm output impedance. Will this new F5 setup sound like your CSX1?
Best regards
I did what Antoinel asked me to do, see picture of crippled F5Tv3 with additional 4 Ohms resistor🙂
And I took some time to listen to the CSX-1, the crippled F5T and the normal F5T ( without the 4 Ohm resistor).
What I can say is that the difference in bass performance has clearly to do with the higher output impedance of the CSX-1. With the 4 Ohm resistors I get equal bass performance with CSX-1 and F5T. Bass is woolly and more boomy that way.
The 4 Ohms didn't seem to make much difference for the rest of the frequency spectrum.
The CSX-1 still has a different sonic signature than the F5T.
The F5T is accurate, easy, powerful, but a bit dull, flat. The CSX-1 has great musicality, sparkle, bright in the mid, high-mid range.... So pianos, guitars, horns, strings they all sound very good.
It is just like the good old 'loudness button' on an old amp is turned on.😀
Maybe the SIT is making the difference here...
Still very curious for other builders comments.....😉
And I took some time to listen to the CSX-1, the crippled F5T and the normal F5T ( without the 4 Ohm resistor).
What I can say is that the difference in bass performance has clearly to do with the higher output impedance of the CSX-1. With the 4 Ohm resistors I get equal bass performance with CSX-1 and F5T. Bass is woolly and more boomy that way.
The 4 Ohms didn't seem to make much difference for the rest of the frequency spectrum.
The CSX-1 still has a different sonic signature than the F5T.
The F5T is accurate, easy, powerful, but a bit dull, flat. The CSX-1 has great musicality, sparkle, bright in the mid, high-mid range.... So pianos, guitars, horns, strings they all sound very good.
It is just like the good old 'loudness button' on an old amp is turned on.😀
Maybe the SIT is making the difference here...
Still very curious for other builders comments.....😉
Attachments
Don't know, my woofers are 4 Ohms, and bass is very present with CSX-1.
But I guess that the 4 output pairs of the F5Tv3 are more authoritative and having more control over the woofer than the CSX-1.
But I guess that the 4 output pairs of the F5Tv3 are more authoritative and having more control over the woofer than the CSX-1.
Hello WalterW. I am glad to read that you have a subjective comparison at ~equal output impedance of the amplifiers. May consider repeating the experiment with diyF6; which will encompass the two similar variables of 4 Ohm output Z, and a Jensen transformer like in CSX1.
N.B. The 4 Ohm power resistors in the pic appear to be low wattage; suggesting that may need to use a much higher wattage ones for improved subjective answers..
Best regards.
N.B. The 4 Ohm power resistors in the pic appear to be low wattage; suggesting that may need to use a much higher wattage ones for improved subjective answers..
Best regards.
Hi Walter,
I have now some sound experience with the 2SK180 in a CCS circuit and in comparison I had the same circuit with an SJDP120R085.
Interesting comparison….
the R085 is more straight forward and seems to have more will…. 🙂
the bass is fairly good.
but it is a rough guy, not very polite….
the SK180 is a great pleasure to hear concerning highs, never heard them so fine articulated, and the guitar or something else has many fine structures and despite the great resolution it gets never harsh….the stage has not only three but the fifth dimension……. 🙂
But in my constellation the bass is too shy.
I do not know if the transconductance values or the gain are important for the sound or especially the bass. The R085 has a transconductance value of around five and my SK180 only around 2.5-3.
So Nelsons SIT with a higher transconductance might give for sure the better sound, but why, if the transconductance is important at all for this……
Unfortunately I killed one of my R085 and I do not know yet if I will ask Mike for a new one….. ;.)
maybe I first try in the place of the R085 with some changes in the circuit a R100 with some Schade feedback…..F2J like….
these simple circuits are so nice to play with!
🙂
Try to put some NFB, lessing the output impedance. Try with 5 dB. At least you going to see what happen improving the damping. IMHO.
Congratulations generg.
Congratulations generg.
I know the resistors are small, but non-inductive 😀 After playing one Coldplay song with a lot of bass, at a fairly high volume, I couldn't touch the bigger ones🙂
Today I repeated the whole sequence and outcome is the same.
I can not compare against a F6 because I haven't build one (yet)
Generg, I have been looking at datasheets from your Tokin VFET, didn't know that one...it's a beast 😀
Hi junitox,
don´t be flattering… 🙂
first rule: there is only one Papa
second rule: I am a lousy "putting together" guy
third rule: this thread is for Papas Sony VFET-thread, that works for sure
better than my lousy tries a la F2J with a SIT
forth rule: I took mostly the circuits Mike R. suggested for CCS or the ACA
and played with them, first in Spice later in reality…and I had support my beloved helping hands from the other side of the curtain
fifth rule: it is easy by going a half step aside from the established paths to
impress people more than appropriate…...
sixth rule: If I ever have a fine working circuit, I will tell it…
seventh rule: playing like this is part killing, see my lost R085.
o.k.?
🙂
don´t be flattering… 🙂
first rule: there is only one Papa
second rule: I am a lousy "putting together" guy
third rule: this thread is for Papas Sony VFET-thread, that works for sure
better than my lousy tries a la F2J with a SIT
forth rule: I took mostly the circuits Mike R. suggested for CCS or the ACA
and played with them, first in Spice later in reality…and I had support my beloved helping hands from the other side of the curtain
fifth rule: it is easy by going a half step aside from the established paths to
impress people more than appropriate…...
sixth rule: If I ever have a fine working circuit, I will tell it…
seventh rule: playing like this is part killing, see my lost R085.
o.k.?
🙂
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