Please enlighten me. Changing tubes making a change is reasonable. Replacing bad resistors also. But how bad does a capacitor have to be to make a change? DF=.1 @ 20K I could believe, distortion @ -135! ??
Replacing all the wire with silver wire also is possible, most likely from resoldering all the joints though not from the reduced resistance. I think I have shown that wire distortion does exist but is -155 db typical. Solder changes were -60 db.
Or did you misread my last post.
Very, very bad. Outright defective. Usually, if there's an audible difference (and actual one) with coupling cap changes, one of the caps is defectively leaky, upsetting operating points.
Yes and there are very very bad capacitors. Now since I haven't measured the capacitors he removed I don't know how bad. But if there was a bad solder joint on one of the capacitors that also could account for the change.
We just don't have enough information to ascertain the reason for improvement, perceived or actual.
I used to think resoldering all the joints in an amplifier with silver solder making a difference was nonsense until I did some measurements. (Well the resoldering makes sense the silver err...)
For those of you interested, resoldering or filling the holes in any PC card through vias can make a difference. The plated solder in the vias has high resistance and is non-ohmic.
BTY nice change of subject!
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Simon, as I stated earlier the amp in question is wired point to point, no PCB.
The resistors were soldered directly on the tubesocket and ground bridge. The soldering was very nice. I also put the old resistors back just to see what would change and sure enough it changed for the worse. These Chinese amps all use the cheapest metalfilm resistors so changing those for better ones could easely yield a nice result.
The resistors were soldered directly on the tubesocket and ground bridge. The soldering was very nice. I also put the old resistors back just to see what would change and sure enough it changed for the worse. These Chinese amps all use the cheapest metalfilm resistors so changing those for better ones could easely yield a nice result.
Don't be silly, SY 
From looking at his other posts, he has only opinions, not evidence. But then he doesn't know that there is a difference.
From looking at his other posts, he has only opinions, not evidence. But then he doesn't know that there is a difference.
Boy SY I am always learning something new about you. 🙂
I'll have to see if I have any steel wire to measure.
I'll have to see if I have any steel wire to measure.
There are quite a few capacitors that use copper plated steel leadouts.
One of these is the Sprague orange drop..🙁
There are two types one 715p the round in profile and has steel the other is 716 and is oval and has copper leadouts..Amtrans audio caps have steel leadouts..
The 715p seems to have deeper bass than the 716..just an observation..
Now why Sprague had steel leads I have no idea..unless its for mechanical strength and the copper plating is so you can solder to it..but this also doesn't make sense because it seems if you use plated cables it has an effect at RF and above frequencies.
ie not as good as a solid conductor..
You can read it here: (Lead wire)
http://www.cde.com/catalogs/715p.pdf
And
http://k6mhe.com/n7ws/Plating.pdf
Regards
M. Gregg
One of these is the Sprague orange drop..🙁
There are two types one 715p the round in profile and has steel the other is 716 and is oval and has copper leadouts..Amtrans audio caps have steel leadouts..
The 715p seems to have deeper bass than the 716..just an observation..
Now why Sprague had steel leads I have no idea..unless its for mechanical strength and the copper plating is so you can solder to it..but this also doesn't make sense because it seems if you use plated cables it has an effect at RF and above frequencies.
ie not as good as a solid conductor..
You can read it here: (Lead wire)
http://www.cde.com/catalogs/715p.pdf
And
http://k6mhe.com/n7ws/Plating.pdf
Regards
M. Gregg
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Steel certainly has higher resistivity than copper, but so what? We're talking about a few milliohms difference in a typical wire length, and since it will be in series with any number of deliberate resistors in circuit, what different would a "slightly resistive" wire make? If anything it would improve metters, because the bulk wire resistance will be more "perfect" than that of actual resistors.
Carbon is even a worse conductor. Yet van den Hul can't make 'm fast enough. An interlink with 28 ohms resistance. Makes steel look like a superconductor!
The logic error you are making is that you equate resistance with sound quality.
Jan
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