Ricev’s, you have no idea of the gist here, where’s your proof, your the one who’s ignorant.
All you do is promote your own commercial and snake oil, and you’ve be deleted for it many times now.
For members that wish to know the truth, on fuses etc
Just change the fuse if old for a quality brand EE industry standard 50c fuse, as fuses (even the snake oil ones) do age after many turn on cycle surges.
Quick blow fuses aging and slow blow fuses aging left to right.
https://ibb.co/0ZtRv4J https://ibb.co/mbzs3RK
As for the wires yes too those also, especially to the ones serving the big current supply to those tube heaters, they now will also be getting blackened and getting hard under the insulation, as well as the where each end terminates. And yes they definitely could put in new $1 Bussman or Little fuses, as the old fuses would have seen some "massive turn on surges" and their holdersAnd the base section inside the amp, of those external bayonet 1/2 turn screw in ones
A perfect example of this
https://twoatsea.com/wp-content/uploads/2018/11/wire-corrosion.jpg
https://lh3.googleusercontent.com/proxy/RZfd90M57YGYP14HAgww8lLxP06o4k6yrqq4ewosKWqYdhBbIixYgrTwytDJ...
https://www.letonkinoisvarnish.co.uk/fuseholder_corrosion_big.jpg
Cheers George