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+--- Thread: Question about filament transformer for bias supply in a Power Scaled Amp (/Thread-Question-about-filament-transformer-for-bias-supply-in-a-Power-Scaled-Amp)
Question about filament transformer for bias supply in a Power Scaled Amp - makinrose - 02-06-2020
This might be dumb question....I'm typically using a DC elevated heaters like what is shown in TUT 3 and TUT5. If I need to run a filament transformer for the bias supply off of the heater supply do need to remove the DC elevation or use caps to block the DC?
RE: Question about filament transformer for bias supply in a Power Scaled Amp - Sherlok Ohms - 02-06-2020
(02-06-2020, 02:05 PM)makinrose Wrote: This might be dumb question....I'm typically using a DC elevated heaters like what is shown in TUT 3 and TUT5. If I need to run a filament transformer for the bias supply off of the heater supply do need to remove the DC elevation or use caps to block the DC?Hello Mr. Makinrose
From what I understand no question can be dumb unless it is the one not spoken - then 'dumb' as 'mute'.
Regarding the filament winding: The winding is isolated unto itself and the heaters or filaments draw their power from it as expected. The loop of the winding to the load and back is complete and whether this loop sits at ground or above or below makes no difference to that loop. If you add another load like a transformer to this loop, the new winding is just another load to the main PT winding and again, neither care if there is any tie to the rest of the world.
I believe this is where Canadians would say, "Beauty, 'eh?"?
Cheerio
RE: Question about filament transformer for bias supply in a Power Scaled Amp - makinrose - 02-07-2020
Thanks for the reply Sherlock! That makes sense and was very helpful.