It’s pretty simple. First you try it dis way. Then you try it dat way. Den you might even consider dat other way.
Fuse Direction for Pass Labs Amp and Preamp
I am going to re fuse my Pass X250.8 and XP-32 with Synergistic Research purple fuses in a couple of days. I was hoping to get advice on a rule of thumb for direction of the fuses. My instinct tells me to start by installing the fuse by the direction of the lettering on the fuses. I am thinking that the direction should be the lettering left to right with the beginning of the lettering facing out of the amp and the end of the lettering facing into the amp. Does this sound right?
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- 75 posts total
When I bought the Duelund CAST-PIOs for my Carys; I asked which lead was the outer foil. "Doesn't matter!", they said. I've had a habit of testing everything for noise/best performance, before committing to an install, for decades. Just an FYI (If one doesn't own an O-scope): Just rig an RCA lead with gator clips and plug it into one of an old receiver/integrated's PHONO inputs, with the volume all the way down. With a speaker attached, of course. Hook up the cap's leads and LIGHTLY grip (especially films) the sides of the cap, while slowly raising the volume. Keep it real low! Change the component's input selector, and switch the cap's leads (don't move the volume). Switch the selector back to PHONO. One direction (when the outer foil's lead is connected to the Positive Phono lead) will result in much more hum. For the lowest noise in a signal circuit; connect the outer foil to the lower impedance (signal source). OH, and: It REALLY DID matter! More info: https://www.aikenamps.com/index.php/where-to-connect-the-outside-foil-on-capacitors |
I tested a pile of SR fuses years ago and noted the results here. They’re dangerous (rated wrong at times so they blow, leading to suggestions that you should use a higher rating than the gear called for...wow) and useless nonsense. Some have claimed their system sounds "out of phase" when the proper fuse direction is wrong or bloviated about how astonishingly fabulous the fuses "sound." Hey, it’s a FUSE... Why haven’t they caught on among manufacturers or most of everybody else? Hmmm...I recently bought a Pass XA25 and called Pass Labs to ask some dumb question and wound up having a great conversation with ’em, but really...I suggest you call Pass and ask about fuses...let us know what they say... please... |
- 75 posts total