All,
I replaced the input cap in my ST35 down to a 1.5uF; and the world is good ! I was able to get the correct bias numbers, and my plate voltage is down to 377v. So, no more worries.
That being said - what bad could come out of having the amp on, with your source off ? As it sits now, I have the amp connected directly to a CD player; as I haven't made a preamp yet. My girlfriend's phone rang, so she shut off the CD player, and left the amp on. It sat like this for 15mins or so.....
Thanks,
Steve