London Power ad

[-]
Search the Forum








(Advanced Search)

Question about filament transformer for bias supply in a Power Scaled Amp
#1
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?  Huh
Reply
#2
(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?  Huh
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
Reply
#3
Thanks for the reply Sherlock! That makes sense and was very helpful.
Reply


Forum Jump:

[-]
Come in where it's warm!
A warm welcome to tube amp modding fans and those interested in hi-fi audio! Readers of Kevin O'Connor's The Ultimate Tone (TUT) book series form a part of our population. Kevin O'Connor is the creator of the popular Power Scaling methodology for amplifiers.
Please remember these three principles: respect, sharing, community.
Not familiar with The Ultimate Tone book series? See discussion topics, or click here to visit London Power/Power Press Publishing.

[-]
Tube Amp Forum Hosted by London Power
London Power logo