OK, I brought the Variac up to 45V, and the output reading was at 7 volts. It was rising as I increased the voltage from the variac. Just to double check, I disconnected the speakers, and the out put voltage dropped to .05V with the variac all the way up to 120V. BTW, I have a volt meter inline with the dimbulb tester so I can see exactly what the amp is getting. Thanks for your time with this.