Yes, measurements rule. Including ABX based hearing tests. I don't think you are addressing me personally, but if you were, let me assure you that improving measuring equipment and measuring technique is high on my agenda. But please leave my little shiny friend out of it.
I can't wait to see the measurements results on the "-140 test gear" and in particular on this magic "ultra low system". My guess, nobody is ever going to see a shred of coherent data from you, other than some "mine is longer" photos of measurement gear displaying some numbers, at best good to impress the n00bs. You haven't shown anything else, ever.
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5 pm here and the wife has instructed me to pour the wine and I will comply.
Merry Christmas guys - have a good one!
Peace
Merry Christmas guys - have a good one!
Peace
yes. what would you like to know from me about that specifically? What room acoustic measurements are of interest to you?
I use equalized flat low distortion headphones and near-field monitoring so there is very little room influence or none.
I use controlled directivity speakers for additional minimizing of first/early reflections; New QUAD ESL and JBL M2.
Both very flat and very low distortion. The ESL are in Bangkok. I have to get the big heavy M2 here some time in 2020.
THx-RNMarsh
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That is what I am concerned about. Compared to the < 1MHz ULGF amp, it is going to need more thorough tests and optimization to ensure stability on various load. Wide BW amps are notorious in oscillation dept.
That is all the interest of this exploration. At least for me. No challenge, no fun.
This said, my actual CFA is rock stable and not lot slower.
One of my goal, too, was to see if any good to design an amp fully from simulations. This is new to me, i always worked on the bench from the early beginning. I like to learn by experiences. No risk, no experience ;-)
Happy Christmas to all of you and your families.
I think you will find the topology is very stable at HF and not at all weird at HF as VFA would be at such high freq.
THx-RNMarsh
THx-RNMarsh
Can posters please cut down on the insults and sniping?
I'm here to read the technical content, which I really enjoy, but the other stuff really lowers the (dare I use this terminology) signal to noise ratio here.
Thanks, and happy holidays.
I'm here to read the technical content, which I really enjoy, but the other stuff really lowers the (dare I use this terminology) signal to noise ratio here.
Thanks, and happy holidays.
How about sharing the charts like you have been? Say, a few images with the most important one first and then next ones in order.
mc head preamp - Quad MC with ZTX devices, but balanced in/balanced out
mm preamp - conventional balanced in/balanced out mike preamp with JFET input devices
preamp/headphone amp - fully differential (balanced in/balanced out) like OPA1632 with MAS6116 R-2R volume controls, input stage similar to LM6172
power amp - balanced input, input stage similar to LM6172
It seems to me much of the signal to noise is within the technical content?
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Indeed. No.
I don't think you are addressing me personally
And I wish you a merry Christmas with your family.
How to pass between CFA and VFA supporters trenches without taking bullets. ;-)
Thank you. something to look at and think about and learn from.
Is the over-all topology a VFA or CFA or CMA in line level?
(DAC level)
THX-RNMarsh
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My phono stage is single ended. After I replaced the TT to pre cable (jacketed) I can turn the volume to max and there is no hum. Just a gentle shhh . . .
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