OK, this is 2 for 2 on screwed up amps for me buying used (at least as far as I can tell). I hooked up the Aragon 8008bb amp using the RCA inputs and my usual Goertz python MI2 speaker cables for the output. I hooked everything up correctly and turned on the amp. It was OK until the output came on, then the amp makes a consistant thud thud sound (thru both speakers), then pauses, thud thud, pauses, thud thud......You get the idea. I can hear something clicking inside the amp when thud occurs. Also, when I turned on the pre-amp and switched to the output selction the thud stopped for a minute, then started again. I tried to play some music to see if it would output something besides the thud. The amp does output sound, but only when the thud happens, you can hear the music combined with the thud.
I need peoples' help to figure out why it would be doing this please. I am thinking it's not grounded correctly, but am not sure. I will try switching power cables and see if that helps at all. That clicking sound inside the amp must be a clue to what's wrong. Thanks for everyones' help with this.