Now that I have one (a 25 ART professional tube mic preamp) I'm getting very nice sound in low volume up until I push it too hard and then I'm getting a distorted clipping, farting type noise.
I can't seem to get a good loudness that I would expect from a power amp rated at this many watts without the ugly breakup. All the voltages check out and everything has been rebuilt.
The speaker is tested and goes wicked loud on my solid state stereo and is 8ohms. I think there might be something sucking output to ground as there arent many ohms from the outputs to ground?