Hello John,
I also had a time delay to allow filaments and other stuff to come up. This was usually the only transistorized part in the whole amp. But, I have to admit that I had often grossly exceeded the plate current abs max limit. This was in the college days when the $20 for a couple more tubes were an insurmountable hurdle. Or let's say a priority hurdle because $20 also bought you two crates of Grolsch :-)))