From a recent review ....
"Designed and built in the United States, the Model 7100 uses a modular design you can clearly see through the chassis vents. Each channel has four discrete output devices and 20,000 microfarads of filter capacitance. So, for seven channels, that's 140,000 µF total, which is a big number in anyone's book. The unit's high current power supply is driven by a 1.2 kVA toroidal transformer with separate windings for each channel."