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AC filament advice…?

Posted by JerryG (A) on April 25, 2007 at 07:06:37

I would like to try common mode chokes right at the output tube sockets. (I have a couple rated for Buddha’s power line conditioner from wayback) The Welborne lab star chief schematic shows this being done….

My modded Tulip amp uses 45‘s, fixed bias and there isn’t a lot of room under the chassis. The filament is AC voltage, and not DC. I’ve measured 0.5 ohm resistance across each leg of the choke (it looks like 20 gauge uninsulated wire) and wonder if that will decrease the filament voltage too much?
Can the choke actually increase AC hum from local pick up?
Is this safe to just solder tack it in and try?
Thanks in advance
Jerry

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