VAC preamps - too expensive?

Anyone changed the fuse in the Master preamp (same as others?)? Does the tray come all the way out? If not, does the fuse insert from the bottom? I changed it a couple of months ago, probably before I put it in my cabinet, but am not succeeding now and don't want to use more force until I know more. Thanks,

@kmmd Unless the design has changed, the Master's fuse holder is a bottom feeder. So unless the unit is on an upper shelf, it needs to be pulled out and flipped over to change fuses. I installed a QSA red/black. While I had liked the AM Ultimate, the Ultimate Premier seemed a design change toward neutral with an emphasis on presence. At least the latter entails an upper end bump, the opposite of what creates a sense of warmth. Alfred at Highend said that if I didn't like the UP, the Master wouldn't please either. 

Yes, I’ve just replaced the Purples in my Lampi dac and VAC preamp with the QSA. Extraordinary difference.

The "bump" I referred to is how sound is engineered, from what I read. True neutral is a perfectly flat response curve. Apparently, most people would not like the sound of that. So for a more palatable, "balanced" sound, a little bump is added on each side of the middle. If more gain is given to the bass, that means warmth. If more on the upper side, that means greater sense of presence and detail, as I understand it. For example, when the SR Orange came out, the initial review on Agon noted that instead of the Red’s "neutral" sound, which I didn’t like, the Orange seemed to include a mid bass bump, because it had gained a bit of warmth. That was continued with the Purple. One upshot of this is, as I understand it, that when audiophiles speak of neutral, what they’re unknowingly talking about is a frequency response that has been modified from flat, and not necessarily in a balanced way.