Pass Labs and Fuses


I continue to enjoy my Pass Labs Int-60 amplifier with my horn based system. My listening area has been intensively treated for acoustic - speaker interaction and it is always a joy for me to listen to a Dialed In system.

For my latest listening experiment I decided to evaluate the sonic differences using three fuses in the Pass amplifier. A brand new Bussman fuse, a Synergistic Research Blue fuse and a Synergistic Research Orange fuse. I keep this amp on 24/7 as suggested by the manufacturer. The Blue fuse has over a 1000 hours on it and the Orange had a 160 hours (continuous playing time) on it before any listening evaluations. The Bussman was listened to for the first time immediately out of the box.

The Bussman fuse did a fine job. But going from the Blue fuse which I had been using to the Bussman, there was a definite change. With the Bussman the sound was now more two dimensional. Instruments were not as full bodied. The depth of the soundstage was compressed front to back. I was more aware that I was listening to a recording versus being in the room with the musicians. The music was less emotionally involving. I did for completeness sake reverse the direction of the new Bussman fuse several times. It did consistently sound better installed in one direction, not huge but it is there.

Comparing the Synergistic Blue Fuse to Orange Fuse was similar to my past tube rolling experiences with my 300B tubed amplifier (but cheaper to carry out). Different tubes change the sound and these different fuses change the sound. Both of these fuses brought out more of the music that the Pass Labs amp was playing when compared to the Bussman fuse. Before any serious listening was undertaken, the fuses were evaluated for best sounding direction - and they both were directional.

The Orange fuse really is exceptional in it’s ability to let me enjoy the music and who is playing what. The detail of Willie Nelson’s nylon strings on his guitar had much better dynamics and richer texture than I have previously heard using the Blue fuse. His Stardust album continues to impress me.

When listening to music that has more musicians playing, such as on Sierra Una Noche, I can more easily distinguish each instrument and it’s contribution to the musical whole. Also in this live recording that uses only two mics, I get a better feel of each musician’s distance from the microphones and that they move toward and away from the microphones while playing. These factors allow me to forget I am listening to a recording of an event. With the Orange fuse, I feel I am at the event as it is playing.

This fuse experiment was fun to do and educational.
Feel free to call.

David Pritchard
575-644-1462

128x128davidpritchard

Showing 39 responses by georgehifi

 us wise old owl types that KNOWS these things are directional.
Yep, a one way brain, can't see the forest for the trees.
What Peter can't you tell???? The other fusers, will be up in arms.

THERE IS NO RIGHT WAY. (it an ac mains fuse, mains alternates direction "60 times in a second" you'd have to pull it in and out and reverse it at the same rate to see if it's directional 😵)

Cheers George
Telling it like it is, voodoo snake oil BS that’s become "almost accepted" in hi-end audio by the gullible.
That not even the manufacturers snake oil themselves will come on here and stick up for their own product, with some sort of EE proof to this ****, it’s up there with Scientology as a hoax. Happy New Year to you and yours!!
And here they are the rest of the (shillers), errr I mean magic circle club.
Immediately there was a change in sound. Noted was and increase in dynamics, more precise localization of instruments, and increased depth of soundstage. There was a decrease in clarity in the midrange. A significant change was obvious.
This is just too obvious for words

Of course it did, as there must be new color coming and they have an over supply of "Orange" and have asked their shills "to push hard"
 
"For two weeks until end of December, we offer an ORANGE Quantum Fuse Special. BUY 2 ORANGE Fuses and GET another one FREE."
Merry Christmas George
You too Boxer, admin must have thought where there’s smoke there’s fire, they're not stupid, he was slapped on the wrist a couple of months back for doing the same thing and went quite for a little.
The proof’s in the fire sale of Orange voodoo fuses and his timely post. That was "oh so subtle" NOT!!
"Immediately there was a change in sound. Noted was and increase in dynamics, more precise localization of instruments, and increased depth of soundstage. There was a decrease in clarity in the midrange. A significant change was obvious."
What a load of snake oil voodoo BS.
Cheers George

There is a purchase 2 get 3 Orange Fuse promo on offer for a short time period.


Of course there is, people are starting to wise up to this voodoo snake oil BS and they have an over supply, wonder what the next color will be.  
George,
Do you know if anyone has tried an SR fuse in one of your products? It would be interesting to hear if it made an improvement to the sound quality.
You obliviously don’t know that there is no mains fuse, the only AC mains fuse is the one inside the fuse box outside the house and the AC service fuse on the poles in the street.
And if there was an AC mains fuse then the answer would still be no, as a fuse is not a diode, it’s a piece of wire.
And to do any voodoo experiments, you would have to do all those other fuses as well, and probably the one/s back at the sub station. That’s why this fuse voodoo is such snake oil.

Cheers George
My apologies George.
I wrongly assumed there would be no mains voltage involved in a passive device.
Thank you for enlightening me.

Common mistake, if you can read a circuit diagram, you’ll see that the signal (green) from input to output of each channel only goes through one fixed passive "light dependent resistor" (LDR), that changes it’s resistive value via a chemical reaction, to the amount of light that is shone on it from a light emitting diode (LED).
The only active part is the LED’s and what powers and adjusts them, the rest where the signal travels, is totally passive https://ibb.co/cCbDC5c

There are no active parts, no volume control, no resistive wiper contacts, no switch contacts in the signal path as active preamps all have.
Hence no fuses as no mains ac is used.
Wrong again, do your homework, yes it’s passive, yes it’s mains powered or can even be battery powered.

Na just put your BS hat on, but don’t forget 100hr burn-in, as AC mains is not alternating, "so these fusers think", and then for an even bigger laugh they turn the fuse around and swear it’s better one way than the other.
What a crock of **** , maybe you should change the fuse without disconnecting from the mains for an even better sound/hit https://youtu.be/aC6S_VuRNGk?t=13
I rang them to confirm fuse size they were extremely enthusiastic about both aftermarket fuses and wooden blocks underneath the amp.
If the fuse made the kind of differences you guys say they do here, they would be in the  Ayre EX 8  from the factory, being already at $6K. And as for the wood blocks 🤦‍♂️
They were just humoring you, they would have          themselves laughing after that phone call🤣, as they are technicians first and foremost, not snakes oiler's. 
Your negative cynicism is not helping the thread at all.
Really!! ya think!
They are totally positive to being correct, just negative to fuser snake oil voodooism.
Sorry george I thought you actually sold audio products.
Sorry, I didn’t say I didn’t, read again, I don’t have fuses in the Lightspeed Attenuator, (and if I did re my last post)

Cheers George

how did you even read that as an excuse?
That's why it's poor, doesn't even rate as one.

I will be reporting my experiences of the new SR Orange fuses shortly.
And this will be "sooo! much better than the Blue it's unbelievable"🤦‍♂️
I fail to see what a manufacturer coming here has to do with any of the above or your arguements tbh.
Simple just to back their product up with these claims here with any EE fact/s. Which ANY! manufacturer would be willing/glad do.
And just because they choose not to do so ( for whatever reasons that none of us are privvy too),
Sorry you got nothing with that poor excuse.
I do not know that yet George so I cannot comment yet.
But thank you for the enthusiasm!
Means a lot!

We all know what sort of answer that will be from one of the "magic fuser club", it’s almost written in stone.
And it will mean nothing!
So both yourself and Wolf have tried or been party to trying of aftermarket fuses and did not consider them a worthwhile sonic benefit.
Not just in sonics, but as a tweak with absolutely no Electronic Engineering foundation. And where even the manufacturers won't come on these forums and back the claims here.

Like I said before, there is not ONE manufacturer that would not hesitate in backing his product in debates like this with the claims made here, that's because AC mains fuses that have these claims are all just snake oil voodoo. 
georgehifi6 - do you know what brand fuse Gryphon uses? I think that is also interesting. Pass Labs uses Schurter Brand.
Yes I did ask to look at it, it looked just like a 50c Bussmann fuse like this, and my mistake they were 6.3A not 3A
https://ibb.co/QnZVtn5
NEVER tried a boutique fuse and NEVER will.

For your YELLING posting info, no I’ve never tried it, and no need to, but at my friends place for a day session with three others where he tried an SR Blue 3.15A fuse in his Gryphon Diablo 300, the fuse was taken in and out 3 x, even turned around once, not one out of the 5 of us could tell what was in compared to the original 3A, the owner "thought" he detected something on one of the occasions, but couldn’t be sure.

These removed post are just posts not even addressing the topic good or bad, that why they were removed. 
Then do your job correctly please Audiogon
Wow talk about suicidal, with statements like that, keep it up boys, you’ll dig your own graves,without me handing you the shovels.

Where are your >$150 fuse manufacturers now to back up your fuser claims, now that you really need them, like ships passing in the night, nowhere to be seen.


Like I said any audio equipment manufacture, with "legit products" would be busting down the door with backup for their product that's being debated, but not the fuse ones, they are like ships passing in the night, not to be seen.
This is a shill fest, that's all there is to it.
If you fuser's really believe what you preach, then get the manufacturers to come on here and debate your claims.
Like I said any audio equipment manufacture, with "legit products" would be busting down the door with backup for their product that's being debated, but not the fuse ones, they are like ships passing in the night, not to be seen. 
Wolf, not even the manufacturers of the >$150 (50cent) fuses are backing any of the claims the magic circle fuser club are saying.
If you look at any "legit" audio product discussed, the manufacturer is always only too happy to give input when anything is debated, but not with the voodoo fuse ones, no way.

Cheers George

Let me guess.....is the one behind it upside down compared to most?

I guess that’s me, would be nice if I had that much influence from down here, I’d use it much more, with this malignant, snake oil, voodoo, rubbish.

And it's the same old magic circle fuser club every time, that come up with monotonous regularity each different color of the >$150 fuses sounds 100% better than the last.

Unbelievable they say, but make sure it’s around the right way, and had at least 100hrs burn in time, before you judge it!!

Even the non technical and gullible aren’t that stupid to be coned by this rubbish
Mods!!
This thread, needs to be shut down, it's turned toxic just like all other fuse threads have. None, not one, especially SR fuse manufacturers have come onto these forums to stand up to what BS they (and the magic circle club) say these fuses can do
 
And it's very dangerous for non technical to be playing around with ac mains fuses, and trying them in different directions frantically, forgetting just once to unplug mains before touching the fuse. 

Cheers George
Same old die hard fuser’s magic circle club, nothing has changed, except for their "Team Leader", oregonpapa who was wrist slapped and had threads closed for, well, you guess and make up your own mind.
I’m very disappointed Georgie Boy
I’m shattered, that a snake oiler is disappointed in me.

What do you call this your selling to the same gullible fusers for $129
http://www.machinadynamica.com/machina31.htm
and these 
http://www.machinadynamica.com/machina62.htm
http://www.machinadynamica.com/machina47.htm
and many other BS voodoo c**p

Yeah this is definitely one that should be in the "scammers" forum, along with SR-HTF's, Bybee Quantum Purifiers .
And let's not forget the daddy of all voodoo snake oil crap, all those years ago the:  
"Shun Mook Mpingo Disc" from decades ago that started the "Audio voodoo snake-oil revolution"

Cheers George
or how much carefully worded hyperbole is generated to shill for SR.
+1 Wolf, he’s taken over from oregonpapa, who was slapped on the wrist for doing it.

I agree with you that fuse direction loses all meaning in an alternating current (AC) application.
Yes this **** about fuses is just snake oil voodoo speak and it’s dangerouse for the gullible non-technical to be playing around with, and needs it’s own place, maybe here at geoff’s website. 
http://www.machinadynamica.com/machina31.htm
Where he and david can get sued if someone gets zapped, in there feverish attempts to hear differences when fuses are turned around, forgetting to turn/unplug from the mains.

Cheers George

Modjeski is a few paradigm shifts behind the power curve.
NOW!! that's rich, coming from you. https://youtu.be/YTY26k0CA0I?t=5
I have used a Blue Fuse in my Pass XP-20 preamp. It was easy to choose direction and, when in the correct direction, contributed to superior performance versus the stock fuse (which was also checked for direction and removed and reinserted as a check).
How is it that one way it sounds better than the other-way??
When the AC (clue here "alternating current") is changing it direction 60 x a second?? You would have to be changing the fuse direction also 60 x a second to prove what you said that it "it sounds better one way than the other".
bdp24
Nelson Pass and Roger Modjeski (Music Reference) are two designers responsible for some of the best sounding amplification available today, and neither "believes" in fuses having a sound. What a coincidence.

geoffkait
It’s a cry in’ shame 😭 those two guys don’t believe in fuses or wire directionality 🔛  Too bad those two guys are so stubborn. They’re probably not good listeners. 😁

That’s why they are "Nelson Pass" and "Roger Modjeski", and you are __(pause)__well, Geoff Kait??, snake oil peddler https://ibb.co/YcrfSsM

Pass uses fuses on their lower powered amps and breakers on their higher power
Yes normal quality industry standard $2 fuses, no voodoo fuses for Mr Pass. 
Cheers George
“stand proud of the boards”
 stands off the board so when it fries it doesn't blacken the board with burn marks.

New English dictionary.
" 5. ADJECTIVE [ADJECTIVE after verb]If one object stands proud of another object that it is attached to or next to, it extends beyond it.  "cretin"
On the rest of his amps Mr Pass was kind enough to use no fuses.
If not he probably used fuse-able links, many do these days and they look like resistors and usually stand proud of the boards some are even smd. Or he could have used circuit breakers, no voodoo fuses.

Cheers George