Fuse Direction for Pass Labs Amp and Preamp

Even crazy GeoffKait new that...

@helmholtzsoul, My man! Lol!

I understand you brother. As I know a bunch, and I do mean a bunch of Powerplant and Avionics Journeymen [master craftsmen (and women)] who work in the Aeronautical industry who were once called ’mechanics’. And these professionals fabricate everything on a rocket or a plane. Has anyone ever heard of Pratt & Whitney, Rolls Royce, Boeing?

Where I sit, mechanics of nowadays are more akin to surgeons than the stereotype of what a mechanic looks like and may be to some..

And to my naysayers and especially to the monitors here on Agon who showed me that it’s ok to debate here in a respectful like manner. How do you like me now?

Speaking of geoffkait, I think he's back? There's a @geoffkait20f6 and he sounds like geoffkait cause he just happened to mention NASA grade ceramic of DH Cones, speaking of Aeronautical Engineering? geoffkait is that you?

Happy listening, even to those that refuse to follow the scientific process of observation and experimentation, in their own systems, with their own ears, FOR FREE (ie: 30 day return policy, from some manufacturers).

@barts, how will you know if you don’t try? There are literally thousand’s of posts here on Agon alone that describe what they hear and how to do it. You don’t need an uber expensive fuse either. Try the Acme Special Coated Audio Labs Silver Cryo Fuses at $20 a pop.

Your ears are no worse than some of our long in the tooth members here, including myself.☺ It sounds as if you’ve already talked yourself out of trying. What’s the expression? Nothing beats a failure but a try? Remember this is a hobby and it’s supposed to be fun!

OP, in the SR fuse packing it clearly states to insert the fuse from the S to the R. Or left to right.

The first thing to do before you take the hood off is power off and un plug the power cable from the back of the preamplifier/amplifier. 

Only insert one fuse at a time and the first fuse should be closest to the IEC inlet and the power train.

Insert the fuse, plug in the power cord and power on, after some period of time you will be able to tell by listening if the fuse is in the right direction. Since these fuses are directional they will sound strident if they are in the wrong direction. If so, power off and un plug the power cord and simply reverse direction.

All the above applies to both your preamplifier and amplifier and my experience with the SR Purple fuses.

And please, don’t listen to the naysayers. It’s your rig and your money. Besides I’ve learned that the monitors here on Agon don’t mind and possibly prefer some spirited debate.

Especially with the so called know it all testers. You know the ones, that only believes something if and only if it’s measured some sort of way. There is nothing wrong with using your ears. Everything is not new audio part bias. As if.

These are the same electrical engineers who don’t believe in cryo treating metals works either even though the aeronautical (engineering) industry and others have been using these techniques since the 30’s, all the way down to the of tiniest parts molecular level to some of the most massive parts for rockets and jet engines.

You will find that in some fuse positions there may be no effect at all. That is one of the reasons to test each SR fuse at each separate position one at at time using only one SR fuse at a time with the original fuses. Is it time consuming? Yes. But you will find that in certain fuse positions no new or SR fuses are needed. As the original fuse is fine where it is. But that comes from a lot of trial and listening. 

And the ones you find you don't need, send them back for a refund before the 30 days are up. Just so you know, there is a buy two get one free sale on SR fuses for the month of April/2022 and they can be mix/matched too.