Kit6550 Soft Start

[Revoli]

My kit6550 has always liked a dramatic start at switch on. It’s not good for my nerves and can’t be good for the amp and I suspect has shortened the life of valves and other components. It would seem a soft start circuit might help. Can anyone guide me on this. I note some posts talking about this but no real detail or examples. Am I right and what’s the best way to do this…..

Many thanks