Soon,
if your Source cannot drive a cable terminated with a 730ns filter, then look at sorting your Source, not the input side of the Power Amplifier.
if your Source cannot drive a cable terminated with a 730ns filter, then look at sorting your Source, not the input side of the Power Amplifier.
The source can drive 18Ohm earphones. The problem is the input impedance is not flat. Sure, one could design a source with a transconductance opamp with the proper damping, but the majority of sources are not like that.
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Depends on what kind of earphone you use, and I normally smooth out the impedance of an earphone as well. So what exactly is your point?
I will not modify every source I use. It is not practical. So let's be more realistic.
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If the sound from your Source is being so badly affected by adding that 220pF RF attenuation cap at the other end of the interconnect and on the other side of the 3k32 series resistor then it seems to me your Source is broken.
The point I am making is that you need to sort your Source.
The point I am making is that you need to sort your Source.
Tell me one single source that will not be effected. Brand and model, available on the existing market, regardless of price; then tell me another that is within US$1000.
If you imply that all source devices are broken, then I think you may have a point. But from my point of view, all receiving side should have flat input impedance in the audio range to provide the least impact and uncertainty on sound quality to the majority of sources available.
If you imply that all source devices are broken, then I think you may have a point. But from my point of view, all receiving side should have flat input impedance in the audio range to provide the least impact and uncertainty on sound quality to the majority of sources available.
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This is becoming an interesting project. I am going to try to get better performance out of orchestral music and hard rock. Really not sure whether it's the speakers or the amplifier, but it certainly is interesting and easier to tweak the amplifier and see what happens.
I changed the 2.2uF which was in parallel with the changed C4 value to a 470uF 100V electrolitic capacitor (would have used a 1000uF cap but could not find one with voltage rating higher than 50V around here), and also removed C1, C2. The sound stage depth increased with orchestral music and sounded more natural with better instrument characteristic separation. C1 and C2 really causes problems in the mid frequency.
I am going to let it run for a while before I start turning the volume up. But initial listening is really encouraging. I am learning a lot.
I am going to let it run for a while before I start turning the volume up. But initial listening is really encouraging. I am learning a lot.
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AKA Panasonic FMs have mids hardness... 😉
When you'll receive the RJHs with the FE boards you'll have a nice surprise...
Basically when you have capacitors like these with charge and discharging with music, it generates current through the ground plane. This couples back into the signal chain. By using capacitors across the power +/- only, you eliminate differential mode, thus it does not effect the ground plane.
So you're adopting a R2R decoupling scheme... it makes sense.
When I've tried 100nF bypass on both LM318 and LM3886 it was always better sounding without them, particularly reverbs and soundstage.
You're using use a bipolar elco, I suppose.
But is the R2R enough to ensure stability?
I am using polarized. Simply because these act more linear with a voltage across them, I do have some 300uF bipolar, but I will wait and see when there is nothing else I can do before I use them. They seem to work fine for me with my switching power, I think you probably might still want to keep the main filter caps on linear supplies, but I probably will play around with those on other amps I have.
Are other hesitant to try my mods, or just being quiet about it because they don't work for them? I would be interested in knowing.
Are other hesitant to try my mods, or just being quiet about it because they don't work for them? I would be interested in knowing.
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+ to positive rail, - to negative rail. These can be closer to the star ground region.
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soongsc, With all due respect, for me, the changes are coming through so fast that I, personally cant get a handle on some of what you are doing. I do have two extra MyRef amps I could experiment with, but as you said earlier, I don't really want to be changing things for the sake of changing things without a clear need on my part to do so.
That is colored by:
1) I am quite happy with the sound produced by the many mods I have done( Mundirf Caps, LFO1, Sonicap for C13 and Blackgate in C9) and
2)The FE is on the way and I would like to hear that before I start modding what I have. That in no way deminishes my interest in what you are doing and I might attempt similar efforts in the future.
One thing that makes me hesitate is my understanding that you are making comparisons between the LM3886 in a powered speaker and not between a benchmark MyRef build and your modded unit. Am I correct in that?
The other major factor is your use of a different power supply. I don't have info (drawings, schematic or references) or full understanding on the significant impact or method of implementation of that element.
I also again have to admit, though highly interested, I don't have the technical background others have to prevent me from doing something really stupid and just blowing up the amps (that means I'm chicken 🙂 ). Perhaps some pictures of your mods would be helpful to builders like me.
With regards and encouragement -
That is colored by:
1) I am quite happy with the sound produced by the many mods I have done( Mundirf Caps, LFO1, Sonicap for C13 and Blackgate in C9) and
2)The FE is on the way and I would like to hear that before I start modding what I have. That in no way deminishes my interest in what you are doing and I might attempt similar efforts in the future.
One thing that makes me hesitate is my understanding that you are making comparisons between the LM3886 in a powered speaker and not between a benchmark MyRef build and your modded unit. Am I correct in that?
The other major factor is your use of a different power supply. I don't have info (drawings, schematic or references) or full understanding on the significant impact or method of implementation of that element.
I also again have to admit, though highly interested, I don't have the technical background others have to prevent me from doing something really stupid and just blowing up the amps (that means I'm chicken 🙂 ). Perhaps some pictures of your mods would be helpful to builders like me.
With regards and encouragement -
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Well, I've thought to have 470uF 100V caps but it seems I must order them.
So I'll try it in mid-February...
On the other end I've just tried the C12 mod, leaving the position void.
The difference is so subtle that I can't tell for sure it's real, BTW is seems that without the My_Ref sounds slightly more 'natural'.
Sorry but I can't agree... there were no significant difference in soundstage, in my setup it were wide and deep before and after...
It's much more audible, instead, the change between different type of caps.
Using FKP2, FKS2 and FKC2 you can hear a difference between them.
Bob,
I do not make frequent comparisons, rather, I sit and listen to a variety of music and try to get a feeling what I don't like about the music that does not sound realistic enough. Then I try to figure out what might be causing it. Comparison only comes when I start to feel satisfied.
I started to work on my own systems because, like an old colleague, I listen to many systems every year, and I simply wonder why are the systems that sound just barely acceptable are priced like that? So it is my journey to figure out why, which started from speakers, the gradually climbed up the sound reproduction chain. Throughout the years, lots of "professionals" have told me some of my views are not correct and referenced some published papers, however, when I proceeded to ask questions about aspects that might influence the outcome of those research, I never got straight answers, nor have I gotten any other technical explanations why my views are not correct; the general attitude was "I am the professional, thus you should believe what I say". I hated that attitude ever since I was in school.
I can feel your hesitation, thanks for the feedback. I realize that I am using a different power supply, but I think the mods should apply to the general linear power supply as well. This is why I like to hear what other people might experience.
I do not make frequent comparisons, rather, I sit and listen to a variety of music and try to get a feeling what I don't like about the music that does not sound realistic enough. Then I try to figure out what might be causing it. Comparison only comes when I start to feel satisfied.
I started to work on my own systems because, like an old colleague, I listen to many systems every year, and I simply wonder why are the systems that sound just barely acceptable are priced like that? So it is my journey to figure out why, which started from speakers, the gradually climbed up the sound reproduction chain. Throughout the years, lots of "professionals" have told me some of my views are not correct and referenced some published papers, however, when I proceeded to ask questions about aspects that might influence the outcome of those research, I never got straight answers, nor have I gotten any other technical explanations why my views are not correct; the general attitude was "I am the professional, thus you should believe what I say". I hated that attitude ever since I was in school.
I can feel your hesitation, thanks for the feedback. I realize that I am using a different power supply, but I think the mods should apply to the general linear power supply as well. This is why I like to hear what other people might experience.