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RE: Heaters in series?

Posted by vetmedrobert@gmail.com on August 6, 2017 at 09:04:24:

What would be your objection to using one filament supply? Both tubes are in the same channel. I could understand objections in terms of channel to channel intermodulation of some sort, but that isn't the case here.
I have had a lot of trouble getting this to work as configured and feel like I am close to getting it to work like I want it to. Perhaps I will try your suggestion regarding plate choke once everything is dialed in and I am happy with the sound.
As regards connecting primary and secondary goes the primary leads are actually brown and blue. The connections as I have it are reversed from what you describe. I don't believe there is any absolute phase so as long as each winding is in phase relative to the other it probably won't make any difference. At least I have not detected any treble rolloff as I have it hooked up.
Thanks for all your help and suggestions.