Hi Fi Tuning Supreme fuse-Burn In?

Question to the OP. Given some "break in" time has passed, has the sound opened up or become more smooth? I have just put in a hifi tuning supreme fuse into my tube phono preamp a couple of days ago and I'm experiencing the same observations. Sound is much clearer and more detailed but somewhat thinner and a little bit too aggressive in the highs. My cart is an AT which is on the bright side and the change in fuse has highlighted this trait.

I would give your fuse change 100 to 150 hours of having a signal run thru it. Also, you should try the fuse inserted in the other direction to see if you like the sound better.

If your sound is still too bright, I would suggest buying a Synergistic Research Blue Wall Outlet that is sold with a free Blue fuse. This combination will improve the details and soundstage and yet the music will be more relaxed and have better flow. The emotion of the music will increase and so will your enjoyment. I have tried the HiFi fuses and while better than most original equipment fuses, I now use the Synergistic Research Blue fuses.

And if you do not like the change in sound, you can return them for a full refund.

David Pritchard

Thanks for the response and suggestion on the SR blue fuse David. I have quite some time to go then as my guesstimation is that I have about 25 hours on it only. I’ve switched the fuse direction 4x and I’m pretty sure it’s in the right orientation. I’m getting much clearer and neutral sound but some vocals seem compressed and the bass got tighter but lighter. When I switched the fuse to the opposite direction the highs become almost unbearably sharp. These are my observations after listening today. 

Its my first fuse upgrade so wanted to get my feet wet so to speak with a moderately priced fuse and hear for myself if there is a change. Still hoping it will smoothen out as it burns in as I’m undecided if I like the change that I hear. 

Tip of the day, if you have any other fuses in the system, even stock fuses, they also degrade the sound if not in the right direction. 

Absolutely correct. Anytime you have access to a fuse that was not been tested for the best direction it is a worthwhile  experiment to listen with that fuse in both directions. 

David Pritchard