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?

mitchb

Inescapable FACT: No one understands exactly how electricity works.   

      That’s why there’s so much Electrical THEORY.     

People risk their lives on electrical theory, just as they do the theory of flight. I suspect you might mean 'hypothesis' rather than theory.

OK you got me, you win, 10ga OFC spools cable is just as good as SRs speaker cabling. I suppose you hooked it all up and did a side by side on two identical systems too? GIVE ME A BREAK, you did NOT. Second if you can’t hear the difference in a UP-OCC/teflon weave from your 10ga OFC spool wire. QUIT trying your hearing is SHOT.

My hearing certainly isn't what it was, but I hear differences easily enough. However my employees' hearing is much better and they couldn't hear any significant difference either; neither could the guy that lent us the cables! That might be different if the speakers were 4 Ohms but they are 16. That makes a big difference.

 

@atmasphere -

     Perhaps I should have said, "That's why there have been so many theories and theorems."

                                                               ie:                                                                                     https://en.wikipedia.org/wiki/History_of_electromagnetic_theory

     Many folks are still wrestling with the High School level understanding, of shoving electrons around, in a conductor.

     Such that do, are still stuck with theories proposed in the 1800s.

     To help you understand the difference between a hypothesis and a theory, a copy/paste from another post:

     The goal of the Scientific Method: to answer WHY observed phenomena occur.

                           The steps of the scientific method include:

         1) asking a QUESTION about something you observe.

         2) doing background research to learn what is already known about the topic.

         3) constructing a, "hypothesis".

         4) experimenting or testing the hypothesis.

         5) OBSERVING the results

         6)ANALYZING the data from the experiment and drawing CONCLUSIONS*.

   ttps://www.indeed.com/career-advice/career-development/scientific-method-steps     

     When one of the Sciences runs into a phenomena, for which it hasn't yet figured out a method of testing (experimenting) the HYPOTHESIS, or: can't yet understand (analyze) whatever data might been found during experimentation, there can be no categorical, answer* to the question, "WHY?", and a, "THEORY" is proposed.

             *Without definite conclusions, there can be no categorical answers.

           "I suspect you might mean 'hypothesis' rather than theory."

 

I thank everyone for a little spring in your step.. I thought I was going to fall into a coma these last couple of months.. :-) LOL

From Kimber about Kimber KAPs:

"All values of Kimber Kap have a red lead at one end. The red lead should go towards the +DC voltage, or away from the –DC voltage. In coupling (DC Blocking) applications the red lead is the signal output end (it will be the same as the +side of an electrolytic capacitor in this position). In a loudspeaker crossover, the red lead should go towards the drive unit + terminal.

The capacitors can be used safely in either direction but the marking indicates which way will minimise hum pickup."

This can be figured out with 99% of NP caps. Kimber just realizes some measurements aren’t accounted for in the OLDER "this is how it works" crowd. Does it make a difference? I repeat from KIMBER. "indicates which way will minimize hum pickup.".

It’s showing where the outside of the film wrap is. Kimber seems to think there is a direction in a NON directional cap. :-) I just happen to agree with the manufacture too. Stealth Caps work VERY well in the right direction. I just installed a set in the Cary and added Deulund .01 bypass (in the right direction).. The umbilical cable was replaced with Kimber and I rewired both preamp and power supply in the right direction. It was wired in both direction from the factory. It’s not now. How does it sound?. Like it need 200 hours to break in.

BTW I’m running my monitors at 12 ohms (static). 400Gan for the summer. What a nice sounding amp.