I've had no problems over 4 years, I think it is. A wonderful amp that is not going to be changed. I can't afford to anyway, now I'm retired. I have to say I don't crank up the volume, I have neighbours. As JohnnyR implies, the tubes have the reputation of taking resistors with them, when they blow. Not happened to me yet.
I can not imagine that you won't be thrilled with your purchase.