Once in a while on ebay you can see a vintage ST-70 on sale, with a bunch of photos.
More than a few times, though, I've noticed the seller show the amp turned on to show that it's working fine, which is very nice, very upfront to do that, I think,
Buuuut, the amp in on without speakers connected to it
Nothing conneted to the input, nothing connected to the speakers output...
Obviously, the seller doesn't know much about tube amps I suppose. Isn't it risky to do something like that?
If the amp is on idle, what are the chance that it could cause some problems?
Thanx for any thoughts