HT1R Combo Tube Life

[Classicplayer]

I have this combo and have been playing it almost a year. Upon warm up, I detect (on and off) some brief static. It goes away within a few seconds, but is this a sign that the EL82 and/or EL83 might need replacing?

I know one of these two is utilized as a power tube. I don't dime the amp when playing, but I use the gain channel almost exclusively.

Classicplayer