Tubes Asylum

RE: A critical inductance choke input filter....

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lotsmorebetter1

A

In Reply to: RE: A critical inductance choke input filter.... posted by 10607 on May 15, 2023 at 07:03:00

I would like to return to the question of choke filtration, specifically, the point of using this design "properly" for filament supplies.
Given the level of filtration/regulation afforded by the LCLC configuration and that afforded by a VERY quiet voltage regulator, is using them both on a filament supply redundant? And if so, which part, the regulator? or the LCLC filter?

Follow Ups:

RE: A critical inductance choke input filter.... - Tre' 06:59:45 07/16/23 (5)
The filament or heater of a tube doesn't change it's current draw so regulation is not needed except for eliminating ripple but my filament supplies don't have much ripple to start with.

My B+ supplies for the voltage gain tubes in my system are LCLC plus constant current source feed VR tube shunt regulated.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
- RE: A critical inductance choke input filter.... - lotsmorebetter1 09:26:09 07/16/23 (4)
  Thank you for your response, it was helpful. You said that your filament supply's current doesn't change; what filter configuration do you use? Pi filter or choke? If you use a pi filter with less regulation, don't you also get more noise? So would it not be helpful for noise to use a very quiet regulator?
  - RE: A critical inductance choke input filter.... - Tre' 16:09:01 07/25/23 (3)
    My filament supplies for the direct heated tubes are LCRCL and my heater supplies for the indirect heated tubes are LCRC with critical inductance input chokes and a lot of capacitance. In both cases the ripple is almost non-existent.
    Tre'
    Have Fun and Enjoy the Music
    "Still Working the Problem"
    
    Edits: 07/25/23
    - RE: A critical inductance choke input filter.... - lotsmorebetter1 16:15:31 07/25/23 (2)
      Thank you. That is very helpful. IN both of your situations, does the resistor do anything to remove some of the noise, or is it only to reduce some of the voltage?
      - RE: A critical inductance choke input filter.... - Tre' 16:20:06 07/25/23 (1)
        
        In Reply to: RE: A critical inductance choke input filter.... posted by lotsmorebetter1 on July 25, 2023 at 16:15:31
        
        Both. The resistor value is chosen to dial in the voltage I need and a resistor before a cap will allow the cap to better filter the ripple.
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        
        Edits: 07/25/23
        
        RE: A critical inductance choke input filter.... - lotsmorebetter1 17:02:24 07/25/23 (0)
        
        In Reply to: RE: A critical inductance choke input filter.... posted by Tre' on July 25, 2023 at 16:20:06
        
        got it, thanks.

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