Okay, I built these and posted about them a few months ago. They sounded great until I finished a stereo version. The stereo version is dead quiet and on par with any audiophile amp out there in the same power range.
I cannot kill the hums at all. Any suggestions. These run 459v on the Kt88 plates, and 159v on the 12AU7 plates. The 12AU7s have about 5v on the cathodes, and the KT88s have about 42v. Any suggestions? I deliberately cut the filament wire on the 12AU7 to see if it was a filament hum, but got nothing so far. Here is the top layout, and I'll take pice of the bottoms so you can see them tomorrow:
Here is the bottom:
Thanks for any help guys,
Blair