[TV MAN]

We need to start a singing radio group! I play the guitar, so maybe get a few vocals? Anyways, Mike, I did try mounting the trans vertically, and even a Thordarson vertical replacement I had on hand and it still transmitted some hum. Not as bad, but it really seems those poly spacers did the trick. There's something about contact that makes this happen. What's so weird is that this chassis is non magnetic. A magnet wont stick to it. It is super hard metal too. So how can that transmit this hum? I mean, if it's strong enough that I could pick up the hum holding an output tranny with my hand and putting it near the chassis, it would pick it up! Of course it would pick it up if I held it close to the power trans, but it was actually strongest if I held the tranny near the center of the chassis - right by the preamp/driver area! Oh, grounding the power trans didn't change anything, nor clipping that green mystery lead to any part of the chassis.

I'm prepping a little more powerful amp build using a similar SS chassis, but decided to go with a vertical power trans on this one. Oh for what this is worth, the hum seems to pick up more with a smaller output trans verses a larger, higher wattage transformer. I'll do a more thorough write up in a new thread once I get this figured out, but am a little puzzled that I haven't found any write ups on the 'net - anywhere. I did even experiment setting a power trans and output trans on a plain piece of steel connected to my headphones, and was quite surprised at how the two interacted. It wasn't what I would have expected and may be able to share some valuable information when it comes to home built amps.