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72.12.138.8
In Reply to: RE: Mundorf? posted by Zatoichi on October 07, 2009 at 04:57:54
Chances are they are either cathode bypass or local powersupply filtering. That doesn't mean a good quality cap won't make a differnce though.
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What should I look for to confirm that the e-caps are being used as a cathode bypass or for local powersupply filtering?
There is no chance that the CAT uses large electrolytics in the signal path.
First of all, it's just common sense. That is a high dollar cost no object preamp. It makes absolutely no sense that they would severely compromise the design and sound by putting a electrolytic capacitor in the signal path. It makes as much sense as putting a one barrel carburetor with a 1" throat on a Corvette LT1. Second if you take the time to look at the picture of the unit you will see a couple of dozen plastic caps that are obviously the signal caps. Third, it even says in the blurb: CAT coupling capacitors are made to our specifications and are better than any other audiophile grade capacitor. Fourth, 47uF is not a value that makes any sense as a coupling cap.
There is no chance there is a electrolytic cap in the signal path on that unit.
Help me out here. If I'm looking at the circuit board traces, what would these caps be next to if they are being used for cathode bypass or local powersupply filtering?
Follow the trace to all the components that the cap lead connects to. Generally the neg end of a cap in the PS goes to ground. Look at the connecting part to determine its function i.e., if it goes to a rectifier tube it is a power supply cap. If it goes to a cathode resistor, then its a cathode cap. You will need to check your tube manual for tube socket connections and you may need to remove the PC board from the chassis to see both sides in order to follow a trace.
How do you know this?
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