Dear Brian,
I am not an audio consultant nor an audio equipment engineer but I would
like to talk, in fact, that Ni-stabilized Sn-Cu alloy is used at many
Japanese big audio and car audio equipment manufactures and some Europeans.
Why are they using it? According to them, it is just because of the sound
quality is the most improved among in the several kind of lead-free solder
alloy. And they also found Bi content solder was no good.
I believe that it is true since I have tested by myself to take out Sn-Pb
solder and soldered with Ni-stabilized Sn-Cu using a radio set in my bed
room which I am listening every night. It's like a magic. But result was
amazing!
Please try by your self if you want to. I can send you cored solder sample.
Best regards,
**********************************
Tetsuro Nishimura
Nihon Superior Co.,Ltd.
Tel:+81-6-6380-1121
Fax:+81-6-6380-1262
[log in to unmask]
www.nihonsuperior.co.jp
**********************************
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, September 08, 2003 7:09 PM
Subject: Re: [LF] resistance od solder joints
> Kay
>
> With all due respect, I cannot perceive that, even if there were a
> difference, it certainly would not be "very obvious", unless the guys
> running the test cheated and tweaked the equipment (this kind of
> behaviour is not unknown in the audio business). Personally, I find it
> very hard to believe that there would be a difference, otherwise. Why
> should there be? The currents present in even high-power hi-fi equipment
> are not sufficient to cause a significant difference in IR drop.
>
> When I wrote the original message, I was thinking of currents in the
> kiloamp range.
>
> Brian
>
> Kay Nimmo wrote:
> > Dear Brian
> >
> > I was interested to read your comments because I have heard (in a blind
trial hearing) the sound from equipment soldered with SnPb and two different
Pb-free alloys. It certainly seemed to me that there was a very obvious
difference between all three - although which is 'better' is of course
subjective. Perhaps I was just imagining it?!
> > regards
> > Kay
> >
> > -----Original Message-----
> > From: Brian Ellis [mailto:[log in to unmask]]
> > Sent: 07 September 2003 08:19
> > To: [log in to unmask]
> > Subject: Re: [LF] resistance od solder joints
> >
> >
> > Thanks for this info, Keith. Firstly, the resistivity figures I gave
> > were for a homogeneous mixture of the metals, without taking into
> > account the presence of intermetallic crystals, which is beyond my
> > knowledge. This would explain the different values, compared with
> > empirically measured values. The actual values are not material; it is
> > the principle I was referring to.
> >
> > With all due respect, having worked as an engineer and director, from
> > 1964 to 1974 for a company right at the very cutting edge of
> > professional sound technology, Kudelski SA, I am aware that there is so
> > much twaddle talked in the sound industry that a subjective judgement is
> > ismpossible. For example, the proponents of valve (tube) amplifiers just
> > do not have a clue as the "better sound" they produce is a result of
> > considerable harmonic distortion, much lower with good semiconductor
> > amplifiers (which are a rare beast, anyway). Double-blind tests with
> > trained musicians with fine ears reveal no difference, for example,
> > between monocrystalline silver speaker cables and a common two-conductor
> > mains cable used for the same purpose, although the former cost 30 times
> > more (and are worth perhaps the double).
> >
> > Your subjective tests of "cleaner" sound imply lower distortion. This
> > means less generation of harmonics, so it actually contradicts "richer
> > harmonics", which are produced by non-linear components. A solder joint
> > is not non-linear but perfectly linear at any given temperature (the
> > current flowing is directly proportional to the applied electromotive
> > force). It cannot, therefore, generate harmonics, richer or poorer,
> > until death does it part. In any case, harmonics are easily measurable
> > by spectrum analysis, so the difference would be easily measurable if
> > there were a difference due to the solder composition and it would not
> > be necessary to resort to the ear, trained or otherwise. I would not
> > mind betting that these subjective tests were not double-blind, but the
> > guys were told beforehand to expect to hear better results with the
> > latest version.
> >
> > I'm sorry, interesting though it be, your report cannot bear scientific
> > scrutiny, although this may be a different kettle of fish if, for
> > example, the THD or crossover distortion of 50 amplifiers, half of which
> > were soldered one way and the other half the other way, were *measured*
> > so that the mean values were significantly better with one or the other,
> > although I don't believe this would happen. If I'm right, and all 50
> > amplis were given the subjective test, but double-blindly, there will be
> > no correlation between the two types and "cleaner" sound or "richer
> > harmonics".
> >
> > Sorry to shoot you down, but I know too much about the audio industry
> > and the myths that are perpetrated in the name of separating consumers
> > from their money!
> >
> > Best regards,
> >
> > Brian
> >
> > [log in to unmask] wrote:
> >
> >>Brian,
> >>
> >>We have reports from several of the well known Japanese manufacturers of
> >>hi-fi equipment that systems made with lead-free solder (in this case
> >>the Nihon Superior Ni-stabilised Sn-0.7Cu which has a resistivity of
> >>0.13microOhm.m at 25C compared with 0.17 for 63/37) have sound better
> >>than those made with 63/37. The tests are, however, subjective in that
> >>they just rely on the opinion of a trained ear to tell the difference.
> >>They talk of a "cleaner" sound and "richer harmonics" but I do not know
> >>whether such things can be quantified.
> >>
> >>There have been reports of better sound from a UK manufacturer of hi-fi
> >>equipment but that test was not really an "apples and apples" comparison
> >>because the lead-free board was hand soldered compared with a wave
> >>soldered/reflowed tin-lead board. We were told that you can improve
> >>the sound quality of a board machine soldered with 63/37 just by going
> >>through and resoldering all the joints by hand. That is probably just
> >>because joints made by a skilled hand solderer are going to be generally
> >>better than mass soldered joints.
> >>
> >>By the way we measure the electrical conductivity of a Sn-3.8Ag-1.0Cu
> >>solder as 0.15microOhm.m (using the four terminal method).
> >>
> >>Best wishes
> >>Keith Sweatman
> >>Nihon Superior Co
>
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