Different Tubes and general purpose?

Agree. It definitely does make a difference in the sound of any component when a fuse blows. There ain't any. 

Another hack:

But, Miller is blathering about his favorite fuse vendor.

Blather? That’ll be the day. Point out the blather. If you can. If not then guess what? You are the one blathering.

I won’t argue whether a fuse can make a [slight] difference or not.

I see. So what will you do, then?

When I tried an aftermarket fuse, there was no discernible difference.

"An" after market fuse? Really? Which one? Sounds to me like you’re trying to call me out without having the integrity to admit you have no idea what you’re talking about, because you’ve never even heard a SR Orange Fuse. Right? More blather.

That was MY experience.

Right. Your experience with.... what? You haven’t said. More blather.

But, there is absolutely no way that a fuse can have a bigger impact than rolling tubes.

Based on... what again? Oh yeah. Your experience with "an" aftermarket fuse! Brilliant!

Rolling fuses would be low on my list of improvements to explore first.

Based on.... your experience with.... ?

Look at Miller’s system on AGon, and note that he isn’t even running original tubes.

OMG! Not even aware tubes do wear out and need to be replaced from time to time! Let me fill you in: even the original manufacturers tubes do indeed wear out and need to be replaced. More learning, less blathering, okay?

They have a sticker on them from theTubeStore.

Thank you, Inspector Clouseau.

They are still KT88s, but I think those are the only tubes that amp can run.

Correct. A dazzling display of blather.

Didn't dismiss. Didn't gush. Merely pointed out, quite correctly, where each is on the spectrum of performance options.

When you have to resort to misrepresenting (ie, lying about) the other fellow you know for sure you have lost.

gunners01-

Thanks millercarbon.  I ask as I’ve read plenty of articles about how there was notable, not step change, improvement in overall sound quality.   I get that that a lot audiophile purchases can either be snake oil or nearly inaudible changes.  
I have spent, at least in my world, a decent amount of $ on my system.  I’m largely pleased but I seam to be chasing the perfect balance and execution of several instruments in certain songs that seem to be not as crisp or prominent as i know they were recorded.  I would like to explore “tweaks” (i guess not upgrades) to my equipment that I’m hope can help me achieve what i want, without wholesale swapping out of equipment.  
My Harbeth HL5 plus sound incredible (coupled with a sub) on several albums (Fleetwood Mac, Tom Petty, New Order - Movement, the smiths - Hatful of Hollow), but on others (Big Country - the Crossing, or Led Zeppelin - 1st album) they seem to fail in the a really crisp and distinct mid range.  I could be the recording, but then again it may just be that these are speakers better suited for classical or jazz.  I was trying to explore other system changes to tease out more.

The components you have are fine. Especially the amp, which haven't heard but certainly is highly regarded. Guy in your situation, almost always better to pursue optimizing what you have rather than trading. Because what you will learn if you do this long enough, its always possible to elevate performance more with a few hundred in tweaks than you can ever get with even a few thousand in a different component. 

One thing you said has me concerned, or gets my attention. 

I’m largely pleased but I seam to be chasing the perfect balance and execution of several instruments in certain songs that seem to be not as crisp or prominent as i know they were recorded.

Being largely pleased is good, and a strong reason not to upgrade but to tweak instead. But "not as crisp or prominent as i know they were recorded." Two things wrong with that. One, you can't know. And two, it doesn't necessarily have to be the recording. Click on over to Better-Records.com you will find a whole business dedicated to just what I'm talking about. 

You're thinking of changing something in your system. Your system is the same for every recording. But you're not talking about every recording. So its not likely your system, is it? 

Also one of the biggest most common mistakes people make is trying to make a song or recording sound the way they think it should. This is actually the exact opposite of what they should be doing. The very best a system can do is.... nothing. It should pass the signal, amplify and reproduce, whatever it is. No editorializing! Every recording should sound different. Completely different. No two the same. Its a founding principle found in tomes like from Robert Harley and its a founding principle of my system. https://systems.audiogon.com/systems/8367  Its in the description. 

But improved midrange presence and clarity are always good. So what you do is get some fo.Q tape. https://www.ebay.com/p/1358280415 Synergistic Research HFT are even better but some audiophools get triggered when the best is recommended over and over again, even though it is the best, so we will switch it up a little. Besides the tape really is amazing AND it more perfectly matches your midrange crisp and prominent quest. HFT are more across the board improving clarity everywhere from extreme low end to the top. fo.Q tape is more focused on eliminating micro-vibrations that muddle up the midrange and treble, revealing fine detail in a very natural way.

One thing that's been noticed with those same recordings you mention, they tend to sound really good right up until it gets loud with a lot of instruments and singing all together and it all starts to congeal. Used to think this was just the way it is. Well, turns out not really. The difference, what cleaned it all up, wasn't component upgrades. Wasn't the Herron, wasn't the Koetsu, nor the CTS cables nor even the HFT. And for damn sure it wasn't no tube. It was a tweak. 

Saying "upgrade" does not make it upgrade. Changing tubes is not upgrading anything. Differences between tubes are slight or subtle at best. Someone here will jump on this so have to say yes there are differences. In the big scheme of things though you will hear much more difference changing the fuse inside the amp than changing the tubes.

That is to be taken literally. The difference in midrange clarity and detail from a $160 Synergistic Research Orange Fuse is a lot more than any tube you can find at any price anywhere. Don't take my word for it. Try one and send it back if you don't like it. No tube anywhere let you do that.

Then before messing with perfectly good tubes on a perfectly good amp look at Cones, power cords, contact cleaners and conditioners. There's a whole long list of things to do all of which will be far more effective than tube rolling. Which is by the way what its called. 

Tubes are not even that big a deal even within the tube amp itself. Transformers are far more important in determining the sound. Caps and diodes, as well. Tubes though are easy to plug in and out. They can be changed. So audiophools change them. Because they can. Which is exactly as good a reason as it sounds- no reason at all.