Sounds okay otherwise. But a very steady shhhhhhhhhhhhhhhhh = new tube time, yes? Had it five years and still on the stock ones, so I guess this question is as dumb as its asker. But is shhhh'ing a common symptom of shoddy/worn-out tubes? It's always done this to a degree, but is now much more prominent, especially if any EQing is done to boost its mids. And it runs apace w/ vibrato. Turn that up, and the shhhhhh'ing becomes shhSHHshhSHHshh, as per the vibrato speed setting. So, put a whole new set in (as I'm inclined to do), or do the one-by-one to see if it's only one or two tubes that need replacing? Thanks for your advice.