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My Primalunal is loaded with Metal Oxide resistors. I'm wondering what kind of sonic signature they have compared to something like Vishay Dale metal film resistors?
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...that I made when I needed to add a loading resistor to my moving coil step-up transformer. I was surprised at how much difference there was between brands.
although I do not have experience comparing non-magnetic metal oxide resistors (if there are such things) with the typical magnetic variety. I've found that any part with steel components (resistors, capacitors) sounds worse than similar parts that do not contain steel. I do like silver-mica capacitors but have not found any that do not have steel wire leads.The old-style Holco and PRP resistors sold by Michael Percy sound the best to me.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
...have less of a sonic character then do capacitors. While I can hear differences among some capacitors, I have found that sonic differences among resistors are too subtle for me to hear......but I'm no GEA, and others are.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
I've never really tried to tell or hear a difference. Noise increases as the resistance value increases, but I'm not one to say it is audible or not when playing music. Some masking probably occurs, etc.
When restoring gear which is one after another for me, I change out resistors (usually "flame-proof" metal oxide) that run hot and are against the circuit board. I've seen quite a few burns from them on both phenolic and glass epoxy in amps and preamps. Sometimes the conductor pad/track is lifted too.
It's inexpensive so why not.
The heat is not a function of the resistor being metal oxide, it's simply the wattage it's dissipating. Any resistor will heat the same way in the same location. It is good to get them up off the board, no doubt.A resistor's tone quality is also dependent on the circuitry around it - where it's used. The tone of a met-ox as a plate load may be an issue, but as a "sensing" resistor in a power tube's cathode it likely won't be.
Noisy, steely, harsh, raspy, piercing, scratchy and obnoxious.
Seriously one of the first things I do when modding for better sound and lower noise is replace the metal oxides for metal films. Digi-Key has Phoenix metal films up to 3 watts.
I always up rate the replacements such as replacing a 1 watt with a 2 watt, a two watt with a three watt for example.
Metal oxides are flame-proof and are used in high temp. applications. Some manufacturers do not mount them up (say 1/4 inch) off the pc board and because they run too hot to touch usually, they eventually burn the pc board and cause trace lift off/epoxy failure.
i'd have to agree. i was amazed with the sonic improvements when i switched from metal oxide to non-magnetic metal film resistors in the signal path of my amp.
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