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Joe, could you post the link to Larry's gound scheme so I can take a look? Thanks Lummox, post some pictures of how you solved the grounding/hum issue. The photo I posted earlier wasn't mine, it was just an example I took from this post: http://www.diyaudio.com/forums/tubes-valves/211731-heater-wiri...

Hi! Did you twisted you heater wires? (I can't really see that in the photos) I mean, something like this: [img:900:675]http://www.charlestonarea.com/octane/2-21-2006/12AX7_heaters.jpg[/img] What layout did you use? Check if you have a good grounding scheme. If you could upload some bigger and clear...