Most tube amps are supposed to be operated only w a load (speaker or resistor across outputs) but I have no idea if this applies to the momentary on-off approach Elizabeth advocates. Best approach is to use a variac and bring the voltage up very, very slowly to allow the capacitors to "re-form" (whatever that means). 2 years is not that long, you might want to ask Chris @ Parts Express who does a lot of modification work on SF gear and I think used to be involved with that company (maybe co-owner??).
How to restart tube amp and pre in boxes for 2yrs
I want to start listening to music again i have Sonic Line 3 SFS 80 and i was told to be careful before i plug in listen anybody have any idea wether it is true i have to recharge the amp and pre before using Ill wait for some answers before doing anything tks for any advises