It becomes a problem when that guy goes online shouting that his SE amp is the world's best amp and the one he bought is crap.
Jan
Jan
If he clearly states that this is his evaluation, according to his own subjective experience, I find it not troubling at all.
It's his opinion and i wonder why he shouldn't have freedom of expression.
As long as he is polite and not looking to offend others.
I think, it is better that set of ears is replaced with "mind". Pleasure, is produced by the mind. The senses carry information to the brain along many nerve fibres, but the creator of perception, is only the mind.
Engineers use the tool of mathematics to create conceptual models and these days to also write software algorithms which help them in their designs. Without these tools, engineering would regress to its early days when the field of electronics was still in its gestation stage.
Do not underestimate the analytical power that lies behind these often hard to understand and hard to use tools.
It depends what he is "selling". In many cases these subjective evaluations turn into claims without any real evidence to support them. E.g. "dreaded SMT sound".
You correctly mention the mind.
Actually I might add a little to that, by mentioning the soul as the one that seeks pleasure and conduct (ψυχαγωγια).
But I digress.
I have not read this long and winding thread post by post, However, one of the best papers about resistors is from the LIGO gravitational wave team https://dcc.ligo.org/LIGO-T0900200/public
They tackled the problems in published data by doing a major measurement campaign. For our applications in audio, the lowest (current) noise was the Welwyn RC55Y, 0.1%, 15ppm/C. The problem with that part is that it has magnetic end caps. How important that is, is debatable. However the Vishay Dale CMF55, 0.1%, 25ppm is almost as good, and is definitely non-magnetic. Mouser is your friend for these. And they are cheaper than the RC55Y too.
They tackled the problems in published data by doing a major measurement campaign. For our applications in audio, the lowest (current) noise was the Welwyn RC55Y, 0.1%, 15ppm/C. The problem with that part is that it has magnetic end caps. How important that is, is debatable. However the Vishay Dale CMF55, 0.1%, 25ppm is almost as good, and is definitely non-magnetic. Mouser is your friend for these. And they are cheaper than the RC55Y too.
Regardless of what one might be 'selling' or not, i better focus on what I perceive.
And what me personally, is willing to buy/accept or not.
In other words that burden of choice and judgment, is on myself.
A person, who states anything is rightful in doing so.
As long as he is not expressing it violently or offensively.
That is how I see it at least.
So the person claiming "that dreaded SMT sound" without any real evidence is rightful in doing so? But those who point out that his conclusions are wrong are denying and ridiculing a fact? Gimme a break.
Can you make a recording of the output of that preamp with TH and the same piece of music with the SMD version? Name them A and B or anything else that doesn't give a hint, post them and we can do an ABX test.
You can read my posts and make you own conclusions on what I mean.
But to make it clear regarding ridicule:
If anyone wants to offend and ridicule someone, they can go ahead.
I am not going to stop anyone.
Personally, I just find it unnecessary and rude.
Mouser are showing 1,814 values/percentage/temp coeff RN55 resistors. A straw poll of values suggests thousands of each in stock.
which is fine for YOUR system. but of absolutely no use to anyone else. Your system might have huge distortiion, FR all over the place and drive people screaming from the room, but if you like it, that's ok. But unlike the OP you are not claiming that Surface mount parts are universally dreadful based on a sample of 1.
No need to twist this around. Nobody in this thread has ridiculed a fact. OP himself admitted that he was mistaken.
It is a bit difficult to decipher all colors but based on Figure 6 MELF resistors have lower noise than general 0805/1206 SMT resistors.
Obviously.
Regarding a more proper procedure, if I dare say, it is basically what schiirrn suggested.
Provide recordings with variable X of interest (SMD resistors vs THT in this case), name them A/B and so we can do ABX tests.
I am in a hurry now, so won't go into details.
Maybe schiirrn can fill in the details.
Depending on what equipment the OP has, a good test between the two is to feed the same signal to a single amp of both resistor types, and measure the difference between both. Done correctly that null test will reveal differences down at -140dB. I have a test system that does exactly that with a real music signal..
Anyway, it would be interesting see by sensitive measurement what the difference between through hole and melf implementations is.
Anyway, it would be interesting see by sensitive measurement what the difference between through hole and melf implementations is.
The RN variety.
The CMF series which used to be more available and at a lower comparative price to equivalent RN, are getting harder to get.
Still, for non-magnetic metal films the RN/CMF Dale are the way to go.
Also, all carbon composite resistors are non-magnetic (obviously), but are quite expensive.
By the way, has anyone tried the so-called ceramic composition resistors that are marketed as a carbon composite replacement?
They are also rather expensive.
As has already been stated several times in this thread there is no guarantee that resistors are the only difference between those preamps. So what exactly is the purpose of that A/B test?
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