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Old 6th June 2009, 10:16 PM   #101
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Default Re: Re: Yes, a resistor can "sound" good or bad.

Quote:
Originally posted by Miles Prower
Pay $10.00 or more for resistors? Not in this lifetime, of that I can assure you.

Even the most devoted resistor fans refuse to pay more. Unless you're talking next year's dollars
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Old 6th June 2009, 10:23 PM   #102
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Today I bought on epay some bulk foil resistors, under $1 per peace. They will be installed in a GNFB loop.

Think of heat generated by the signal, Miles. And of Tempco.
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Old 6th June 2009, 10:25 PM   #103
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Quote:
Last project, I ordered some 68K / 1W metal films, and these were the size of 0.25W C-comps.
Did they come from digikey? We bought some 100R 1/2W metal films and they were smaller than normal 1/4W size. At first I thought it was a mistake until the manufacturer datasheet confirmed everything. They were garbage and became open after a few power cycles.
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Old 6th June 2009, 11:31 PM   #104
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Hi,

Quote:
Originally posted by astouffer


Did they come from digikey? We bought some 100R 1/2W metal films and they were smaller than normal 1/4W size. At first I thought it was a mistake until the manufacturer datasheet confirmed everything. They were garbage and became open after a few power cycles.

That miniaturization process has been going on for about a decode now.
But did you check you were operating those resistors within the specced voltage range?

Cheers,

P.S. @Wavebourn: a good place to find out what a resistor sounds like is in the GNFB-loop indeed.
Hard to fault those VSH bulkfoils.
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Old 6th June 2009, 11:50 PM   #105
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Hi,

Quote:
Originally posted by Conrad Hoffman
Frank, along those lines I think if there's anyplace that a large group of resistors makes a difference, it's stepped attenuators. Still, I don't trust my ears because of that expectation bias. It's too hard for me to accept that a cheap Radio Shack pot sounds the same as an Alps pot or a high quality resistive divider chain soldered to a silver contact switch. The sound difference might just be the accuracy of balance, but given my uncertainty and inability to measure, I go with the stepped attenuator.

Well, a large group of resistors in a stepped attenuator would or should have an audible effect provided you'd build a series ladder.
One of the worst of its kind BTW.

There most certainly is a BIG audible difference between cheap plastic track pots and ALPS pots and even within ALPS range of pots there is a marked difference between the various models offered.

Oh, it's not a matter of L/R balance either although the more expensive ones are usually better calibrated though.

Just trust your ears, don't expect anything and.....listen.

Cheers,
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Old 6th June 2009, 11:56 PM   #106
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So, do you think a string of resistors soldered together is the sonic equal of a single resistor of the same total value? I've always thought the logic behind shunt attenuators was a bit daft. But who am I to judge; my hearing was better 30 years ago.
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Old 6th June 2009, 11:57 PM   #107
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Quote:
Originally posted by fdegrove

P.S. @Wavebourn: a good place to find out what a resistor sounds like is in the GNFB-loop indeed.
Hard to fault those VSH bulkfoils.
Yep. Big resistors with high tempco may compress/expand, while small ones distort, especially basses.
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Old 7th June 2009, 12:29 AM   #108
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Hi,

Quote:
Originally posted by Conrad Hoffman
So, do you think a string of resistors soldered together is the sonic equal of a single resistor of the same total value? I've always thought the logic behind shunt attenuators was a bit daft. But who am I to judge; my hearing was better 30 years ago.
That big string's probably even worse than a single one of the same value.
Nothing daft about shunt attenuators really.
You'll need to figure out a few parameters to see if it fits the circuit impedance-wise, use a make before break switch, but other than that?

My hearing isn't what it used to be either but then it doesn't have to be to detect differences unless they happen at the very high end of the audio spectrum and then some...


Cheers,
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Old 7th June 2009, 12:37 AM   #109
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Hi,

Quote:
Originally posted by Wavebourn


Yep. Big resistors with high tempco may compress/expand, while small ones distort, especially basses.


Nothing to add.

Except perhaps that I'm a little surprised to see no one mentioned non-inductive WW resistors yet....

Cheers,
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Old 7th June 2009, 12:56 AM   #110
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Quote:
Originally posted by fdegrove


Except perhaps that I'm a little surprised to see no one mentioned non-inductive WW resistors yet....

When I was a kid I damaged lots of them!!!

They were like small fabric rugs made of manganine, or constantane, or nichrome wire, in lacquer and silk insulation. Such rugs were wrapped around Bakelite spools with 4 legs each.

...I want a time machine! Badly! I damaged high precision hermetically sealed in copper boxes silver mica caps, in nanofarade to tens of nanofarade ranges! Also, I damaged many line transformers with permalloy and litz in silk wires, some of them were hermetically sealed in copper boxes.

Shame on me!

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