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In Reply to: RE: Do Vishay resistors have a "sound" ? posted by hukkfinn on February 07, 2010 at 10:16:45
.... but I wasn't sure if he was saying they SOUND the best or that they reject RF noise the best:
"My own experience is not with volume controls, but with damping RF noise. PRP, but only the half-watt size, are the best I've found."
Follow Ups:
I have a friend who evaluated them in the context of cable construction, and he tried many other types. Even the quarter-watt PRPs do not sound as good as the half-watt to him.
It is a stretch to assume they will also be the best in active circuit applications, but I would not be surprised. Holco seem to have an odd sonic character no matter where they are used. Thus, it is worth trying the PRPs, which are inexpensive.
There are many types of Vishay resistors. You have to be more specific about which one.
Please email me via the Asylum Al, I would like to discuss your AC filter designs which I have recently been experimenting with.
Sorry, I had to find out what he used.
Metal film Vishay resistors, 1/3 watt. Not S102 and not another "named model" of Vishay resistor. Just "metal film".
I also found that all of these were shunts to ground. None of them actually carry the music to my eardrums.
He also replaced the internal wire. Perhaps the problems I am experiencing are more likely due to the new wire that he used (which is stranded high quality copper of very high purity).
Your sonic description suggests the mod resulted in a lot more distortion, not just a subtle shift in tonal balance or character.
If all the new resistors are shunts to ground, the original volume control must have only used two of its three terminals and there must be a series resistor between the previous stage output and the input to the volume control. Otherwise, the modified preamp volume control circuit is now different and may be overloading the previous stage.
This question refers to a tubed phono stage with no volume control. I replaced the internal wiring and 3 resistors that appeared to be cheapies with vishays, 1/3 watt, not any particular brand or model of vishay. Just metal film.
The previous question was about a tubed preamp that had a volume control. I still have to track down what exactly the modder did to that unit. He replaced the volume controls with the same kind of vishay resistor but did not touch internal wiring.
In the volume knob mod, the vishay resistor carries the signal. In the more recent tubed phono stage mod, the vishay resistors are all just shunts to ground. Strangely, both units share the same undesirable qualities (strident, way too much upper midrange, loss of depth and loss of bass).
I am very intrigued by the suggestion above that shunts to ground are even more crucial to sound quality than resistors that carry signal. Wow. Would never expect to hear that.
Hukk
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