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Re: shared versus separate filament suppies....

Each chassis has it's own star ground. The only ground between chassis is the IC (or in the case of separate power supply chassis, there is a ground wire that feeds to the star ground in the receiving chassis). The only chassis that is earth grounded in my system is the preamp.

BTW, I keep the filament (even when they are DC) in a separate wire from the B+ when running between PS chassis and signal chassis. I like to shield the B+ line. Filament supplies can be very noisy and you don't want that getting into your B+.

Tre'
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