Which SR Blue or black Fuse

@glupson I recently had an AC fuse in my IEC connector blow when switching from triode to UL mode. Turn on and switching surges popping fuses is not as uncommon as you may think.  In fact you can search the forum and find others here posting about it over the years.

I've had plenty of fuses blow because my amp has a massive power supply and the most basic in-rush current limiting. I've gone through about half a dozen this year. 

If you need a reference from a tech who's fixed the damage exotic fuses have caused, talk to Ramtubes. 

I had a Hifi tuning fuse  blow up for no reason  A few years back. 
 Why bother taking the risk, even if it’s minuscule, for absolutely zero gain? 

Sounds like operator error. No offense. There’s a reason for everything.

 You’re right, I probably installed in the wrong direction! 😁