emster"two of the amps have had intermittent output problems which I ascribe to either overheating in the cabinet or a short internally."
What makes you think there is a short circuit in you're amplifiers that is highly unlikely it is much more likely that they are overheating why don't you take them out of the cabinet and/or use a proper fan to cool the amplifiers to prevent this problem but also Bel Canto is known for quality problems but I would check the most obvious problems first before arriving at the difficult conclusion that they are junk and should be discarded.
What makes you think there is a short circuit in you're amplifiers that is highly unlikely it is much more likely that they are overheating why don't you take them out of the cabinet and/or use a proper fan to cool the amplifiers to prevent this problem but also Bel Canto is known for quality problems but I would check the most obvious problems first before arriving at the difficult conclusion that they are junk and should be discarded.