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Top resistors

Many threads with opinions on boutique coupling capacitors, but very little consolidated information on the sonics of resistors. Anyone care to share their thoughts on the attributes of their favorite brands & types for specific tube and SS applications? How much of a difference does a good resistor make?

My interest in the topic increased after recently installing the latest Texas Components nude Vishay TX2575 in several SS and tube phono & LS components. This was a proverbial "Ah-ha" moment-- a stray resistor dropped into signal path here or there, surprising with an improvement that equalled or surpassed the impact of a switch to a top coupling cap like V-Cap or Mundorf.
dgarretson
pbnaudio's avatar
pbnaudio
1,613 posts
 
Look here Caddock

Depending on where in the crossover the resistor is inserted changing value is not recommended as the components values before the resistor are chosen seeing a certain load. Changing the resistor values will therefore change the filters transfer function i.e the crossover point of the tweeter.

However if the resistor is meant to be changed by the end user then on your question about power handling of the resistor in a tweeter crossover anything above 15-20W should work just fine, if you want to spend the $ go for the Caddock MP9100 they are available at Mouser MP9100 8 Ohm
vit58
3 posts
 
Thanks a lot!
Actually the resistors are outside the crossover system, so it shouldn't change the crossover point. But they do act as a kind of fuse, whereby upon certain critical power load they will open saving the tweeter from injury. Thats why I was asking about its power handling capacity. I understand that if the power rating is too high, they won't do their job as fuses, right?
pbnaudio's avatar
pbnaudio
1,613 posts
 
I do not see a Caddock MDN series of resistors listed anywhere so it would be hard to identify its wattage.

As far as using a resistor as a fuse, I've never heard of such thing and would consider it sub par engineering at best, probably not what one should expect form the folks at Wilson.

I would not worry too much about the fusing issue and just use the best resistor I could find, the Caddock MP9100 certainly being one of them.

Good Listening

Peter
vit58
3 posts
 
Yes it is strange that there is no reference to the MDN 0178 series on Caddock's website whatsoever, but it is clearly printed on the resistor itself. As far as replacement is concerned, I saw a new model on Caddock's website - the MPM 20 (with gold-plated leads). It looks like the best they have, but unfortunately it is not featured in any of the internet shops or Caddock dealers websites. Can you recommend where to buy them?
sherod
1,690 posts
 
I realize this is a thread about resistors. I've ordered some PRP to try out in a vintage Marantz 2270 receiver on the preamp board I'm rebuilding to compare with the stock carbon resistors Marantz put in there. But I noticed in an earlier post by Rodman99999 raving about the sonic qualities of a vintage Tungsol CTL/6sn7GT tube. I am about to receive a preamp that uses two 6sn7( I believe the factory tubes are a NOS Sylvania 6sn7 type, but was curious how the Tungsol tube mentioned would sound like. I just did a check on Ebay and what few there are of this tube, the prices are ranging from $375.00/ pair to $675.00/pair. Are these NOS tubes really worth this much? Wow!
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