Fired up the old twin today (hadn't played it in a few months) and the tremolo is very weak... I never use the trem much so I don't know how long it's been like this. I can hear the faint "tick tick" when the trem is on and it speeds up when I adjust the speed control and everything... but it's not actually tremoloing the signal. When I turn the intensity control all the way up it's just barely audible but you really have to listen for it. I tried another tube. Footswitch is good and switches off the ticking. I also cleaned the footswitch jack. Any ideas?