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Is the uf4004 an upgrade over the 1n4004 or is there something better then both of them?? There are 4 of them that make up the recifier bridge of a pre-amp section in an int. amp. Im doing some repairs on the amp and while I have it open ive been thinking of upgrading some parts. Im also going to replace all the lytic caps since te amp is 15+ years old. I will be keeping the same values but possibly upgrading to better parts if I canot find the origionals. My goal is really mostly preventive maintenance but if i can get better sound as well thats just a plus.
Follow Ups:
learning you should just do the repair first and make sure that the repair correct, then after you have let the component run-in for a few days and everything is fine then you can go on to the bridge to upgrade. One of the bigger problems many run into is doing too much at once then the component doesn't come out the way they wanted and then their unhappy. This way if something goes wrong you know where to start looking and not be looking everywhere.
UF for Ultra-Fast.Don't know how much that counts in audio, IME, each UF400x I've tried gave a softer, slightly veiled sound-tubish maybe, Always removed after a while.
I like to use BYV-series FREDs to build bridge rectifiers. They are cheap, and as long as it's not a high-current power supply they are great. Gives the power supply a LOT cleaner DC, and is usually a very noticeable improvement in sound over "normal" rectifiers. They come in really high voltage ratings, but I've had trouble locating them cheaply that can handle much more than 2A current. But most of the preamps I build work just fine off less than 1A, so i'm good.
I qwould think that Schottky diodes would be an even better choice? Arent they even queiter than Freds?
I've been meaning to try Schottkys someday, just haven't gotten around to it yet, as finding them that can handle the voltage levels of a lot of the stuff I work on isn't easy. For instance, a lot of the classic NAD stuff that I love to work on has rail voltages in the 40V range. Just out of paranoia I guess, I would want at least an 80V rated Schottky. Even a 40V Schottky isn't easy to locate, and I've been happy with the FREDs I've tried so far.Dangit, now you've gotten me curious again though. I have a preamp that runs 15V rails, maybe I'll find 4 30V Schottkys and see if it's worth the trouble. Probably won't be soon though, there are 5 pieces in the "Fix It Now" pile. Maybe I'll try it before I start on the "Back Burner" pile of equipment (not EVEN going to say how many pieces live there).
There are higher voltage Schottkys around, but they are pricey. I actually got some samples of the Ixys FBS10-06SC Schottky bridge which is rated for 600v 6.6a! Parts Connexion sells them but they are expensive, for $60 they better be amazing! I havent gotten around to using them yet, I guess they could be used in a preamp, dac or even a small Tripath amp.
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