Dave Bullet

My Cambridge 840w hums at home. I took it to the local university for a listening session and there was zero hum. I blame my AC at home...

I think that's usually indicative of DC riding on the AC mains input. Toroidal PTs are (particularly) susceptible to a DC offset. Check...

No one seems to do double blind testing. I realize randomly switching out a power route is non trivial, but as Danny claims the...