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Re: shared versus separate filament suppies....

Thanks Tre', this will be very useful. Since your last post I installed a second filament transformer for the 300b's. It may be safer now, but the hum is much worse. I am guessing it's a grounding or layout issue, so that is what I will start on next. Know of any good web sites on how to do star grounding layouts? Also, do all the filament leads to the tubes from the filament trannys have to be separated? As it is now I have bundled them from the PSU chassis to the front end chassis and then spread them out. Wondering if that could be a source of hum?
Thanks!
Vince

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