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Quantum Science Audio light blue fuse; $71, what a bargain!

I wanted to start a new thread about the more affordable versions of these fuses. I don’t doubt that the higher end versions are amazing, but most of us aren’t very likely to be able to hear them for ourselves. Fortunately, pretty much anyone who is serious about building a musically enjoyable and engaging system can get a good taste of what they’re all about.


I’ve had the light blue QSA fuses ($71) in my CD transport and DAC for over two weeks, now. They replaced SR blue fuses, at around twice the price, and easily bettered them. I am expecting one more light blue tomorrow, to replace an SR orange in my amp. I’ll give an update on that, once I get it installed and listen.


Meanwhile, here are a couple quotes from my posts on the other thread:


“What I am hearing is; voices & instruments are more solid and lifelike, with increased natural detail and sense of space, better dynamics, and a more relaxed overall sound.”


“Just got in a second light blue fuse for my DAC. So far, more of the same improvements I got in my CD transport. Very nice!😃 One thing I appreciate is the break in seems to be pretty quick, without any of the nasties you get with some other stuff. Pop it in, and you’ll hear improvements in short order, at least that’s been my experience.”


I am continuing to greatly enjoy what these fuses bring to my system, and am really looking forward to getting the last one in my amp.


tommylion
georgehifi's avatar
georgehifi
10,312 posts
 


This is "snake oil" to the max, to those thinking about being sucked into this voodoo. Just read this, it's all you have to do to keep an ac fuse in good order.

To those "non technical" members that are interested, do not listen to fusers, listen to the techs of this industry that design the audio products you have.
AND YOU WON"T SEE THEM ON THREADS LIKE THIS AGREEING WITH THESE FUSERS
Just clean and tighten your fuse holder and re-new your fuse (if old) with a good quality 50cent Bussman, Littlefuse or similar.
As with "many switch-on surges" they do deteriorate, bend, stretch and get crusty with electrolysis formations on their fusible wire elements before they give out, as these pics show of a fuse wire element ageing over time show. https://ibb.co/9NbTwqK
(even the $$$ boutique ones will age just as much also)
Cheers George

 
tommylion OP
874 posts
 
Frank,

Glad you're liking the yellow. I'll probably upgrade to them when I can. Meanwhile, the stones have done amazing things in my system. I’m thinking there may be a “synergy” going on with them and the fuses, possibly with PPT products as well. They certainly all play well together.
thecarpathian's avatar
thecarpathian
4,498 posts
 
Frank,
 did you go straight to yellow, or did you get a blue first?
grannyring's avatar
grannyring
6,506 posts
 
I put the Light Blue fuse in my preamp yesterday and listened for a couple of hours. I did not like the sound as much. I then reversed the direction and everything fell into place beautifully. No doubt these fuses are directional. We could hear it immediately and by immediately I mean within 30 seconds of playing my first demo song.
The blue fuse replaced a stock fuse which was also new. The SQ improvement is just so obvious that anyone who cares could hear it after one song. Mids more fleshed out, stage is larger, sense of ease and natural flow improved. I like the Blue and will buy another for my dac.
grannyring's avatar
grannyring
6,506 posts
 
I have an SR Orange in my dac, so it will be a comparison between the two. 
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