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Old 1st June 2009, 03:48 AM   #11
ccschua is offline ccschua  Malaysia
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For IV resistors, those precision Vishay S102J work wonders follow by the Caddock TF020. In tube amp, other such resistor include Audio Note Tantalum resistor is also very sought after by 'no cost barrier' mod.
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Old 1st June 2009, 03:54 AM   #12
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Wavebourns point above is important - if there is no DC bias across the Carbon Composition then distortions are symmetrical, that is, no additional 2nd harmonic. When used as anode loads and similar however you do get a DC bias and so distortion is asymmetrical and you do get additional 2nd harmonic distortion.

I started playing with Rikken Ohms (back before I saw the light) when I was playing in the sand pit designing and building SS amps. A Rikken Ohm or 2 in the right place could mask all sorts of nasties. I quickly found that taking out the Rikken Ohms and fixing the underlying problem(s) was a far superior way to go. That eventually gave me a "sniff sniff" superior attitude to Rikkens and similar. When ever I saw one in a circuit (a lot of CD player "upgrades" use them) I started to wonder what limitations / nastiness they were trying to conceal.

I have never used Rikkens in a tube amp.

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Old 1st June 2009, 04:18 AM   #13
tinitus is offline tinitus  Europe
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They are called carbon composite
Takman use carbon film
Same hing, or different
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Old 1st June 2009, 04:26 AM   #14
jjman is offline jjman  United States
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On the plate in guitar amps, CC are purported to be the best sounding but the most hissy. MF are said to sound the worst but have the least hiss. Carbon Film are said to be in the middle in both regards.

Using a higher watt rating is said to reduce hiss in such an application.
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Old 1st June 2009, 04:53 AM   #15
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If putting a resistor directly in the feedback loop, consider the input current of the feedback device. Often this current will be nonlinear with voltage, creating a nonlinear voltage drop across the resistor, which injects distortion. This should have little if any affect on more precise amps with lots of OLG, and I don't know about tubes since I've never messed with them.

But just something to consider before we assume it's the resistor causing the distortion rather than something else.

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Old 1st June 2009, 04:16 PM   #16
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Default Yes, a resistor can "sound" good or bad.

[QUOTE]

How? It's a resistor... some kind of heating effect that changes the resistance? Possibly inductance if it is a wire wound?

Just curious, it's the first time I've heard that resistors can effect the sound...[QUOTE]

FYI, a realworld resistor besides being resistive, is also inductive & capacitive. How much it may affect the sound of music depends on how it is manufacured, and where it is placed & how it is used in the design of an audio amp.

Take example of a carbon composition resistor, a 100R (ohms) 1/4W gives 0.0007uH, but 1W of same resistor give much higher
inductance of 0.017uH. So try to use least wattage resistors possible unless they are power handling.

Now you can see why resistors of same resistance but of different brand/make can sound different, given sharp ears.

That said, I do not advocate speding big bucks to get exotic brandname resistors to get 'better' sound. On the contrary, I only use no-name resistors for building audio amps which includes phonostages. By ying-yang parallelling/serieing resistors of right values, the inherent inductance & capacitance of the resistors can be greatly reduced.

Yes, when a resistor is heated up during operation, its resistance will fluctuate (up and/or down). Wirewound resistors tend to increase its rated resistance as its ambient or operating temperatures rise.


c-J
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Old 1st June 2009, 09:36 PM   #17
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Default Re: Re: How can a resistor "sound" good?

Quote:
Originally posted by HollowState

It's also been my experience that metal film resistors will provide an increase in high frequence response over carbon comps when used directly in the signal path.
Perceived or measured?

Carbon comps' biggest offenses are noise, tolerance, and voltage-dependent resistance, but they are not significantly reactive compared to spiral film resistors, so high frequencies should not be a problem. You might find, however, a perception of less high frequency "energy", because they are less likely than film resistors to induce parasitic oscillations that might intermodulate their way back into the audio signal. A good compromise, of course, is the metal glaze resistor - which can do decent power, has low inductance, doesn't blow up with pulses, and has lower noise and VDR nonlinearity than a carbon comp.
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Old 1st June 2009, 09:58 PM   #18
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Default Re: Re: How can a resistor "sound" good?

Quote:
Originally posted by HollowState



that golden eared audiophiles swoon over for their glorious sound quality, were produced on equipment that was filled with carbon composition resistors. That's all they used, with the possible exception of the very lowest level input stage where you might find a wire-wound plate resistor.

Morgan Jones valve amps 3rd edit. Has no time for carbon resistors. Quote p.204; <Only as grid stoppers>. The rest of his comments on p.202 are comical.

Well ? I replaced this carbon comp resistor (in pic) in the signal path from a 6L6 amp made in 1957 because it was wildly out of tolerance (+30%).By fitting a newer replacement I was expecting a sound difference but I was dissapointed. One must expect a large drift from carbons over a period of time.

Strangely, after 40 yrs I am returning to wirewounds as anode loads. They are far more stable and in comparison noise free.

richy
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Old 1st June 2009, 10:10 PM   #19
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I remember carbon resistors used in telephone receivers... They sounded very specifically, their membranes were metallic, so the sound was metallic. Also, they changed properties with age because carbon particles were becoming thinner, and used to bake to each other. Also, they could not be totally hermetic, so a moisture from user's breathing affected them...

The same, about carbon comp resistors in amps: change properties with age, moisture, heat, current, voltage, non-linear, noisy. But can withstand short overload (bigger physical volume of resistive substance is needed for the same power rating than for film resistors), like slo-blo fuses.
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Old 1st June 2009, 10:16 PM   #20
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Hi,

That come to no surpise to me, anode loads and WW resistors work well together.

Anyone remember Holco resistors?
Built a preamp or amp using only that brand of resistors and you'll definitely "hear' what that resistor really sounds like.
Same for caps, wire, valves, etc., etc.

Trick is to know these little colorations and use them like a chef in his kitchen.
Too much of a good thing.....

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