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In Reply to: pi filters and choke filters for tube filaments posted by lotsmorebetter1 on May 14, 2023 at 16:34:14:
will insure that whatever ripple is left at the end of the filter is a sine wave. A cap input filter produces saw tooth ripple and that is very audible and hard to listen to.For my 300b SET amp filament I use a LCRCL filter and the ripple is a very low and is a sine wave.
I think DC filament heating gets a bad rap because it is normally not done right. Many designs just have a bridge followed by a big cap. Not good!
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/14/23
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Follow Ups
- A critical inductance choke input filter.... - Tre' 19:02:42 05/14/23 (22)
- My experience as well! - gusser 15:29:52 05/22/23 (1)
- "Dirty DC for filaments is worse than AC." Absolutely. nt - Tre' 09:39:25 05/23/23 (0)
- What size choke are you .. . - John PA 11:59:32 05/15/23 (3)
- RE: What size choke are you .. . - Tre' 13:18:05 05/15/23 (2)
- So what you are saying is. . . - John PA 12:20:31 05/17/23 (1)
- RE: So what you are saying is. . . - Tre' 15:32:29 05/17/23 (0)
- Agree with Tre - garymuffley 09:20:50 05/15/23 (0)
- RE: A critical inductance choke input filter.... - lotsmorebetter1 20:36:59 05/14/23 (14)
- RE: A critical inductance choke input filter.... - Tre' 07:03:00 05/15/23 (13)
- RE: A critical inductance choke input filter.... - lotsmorebetter1 10:58:20 07/10/23 (6)
- RE: A critical inductance choke input filter.... - Tre' 06:59:45 07/16/23 (5)
- RE: A critical inductance choke input filter.... - lotsmorebetter1 09:26:09 07/16/23 (4)
- RE: A critical inductance choke input filter.... - Tre' 16:09:01 07/25/23 (3)
- RE: A critical inductance choke input filter.... - lotsmorebetter1 16:15:31 07/25/23 (2)
- RE: A critical inductance choke input filter.... - Tre' 16:20:06 07/25/23 (1)
- RE: A critical inductance choke input filter.... - lotsmorebetter1 17:02:24 07/25/23 (0)
- RE: A critical inductance choke input filter.... - Ian L 14:55:29 05/15/23 (0)
- Have to Disagree - Triode_Kingdom 11:17:16 05/15/23 (4)
- UltraSonic AC - banpuku 12:43:35 07/10/23 (0)
- Very interesting! - Salectric 02:06:54 05/18/23 (1)
- RE: Very interesting! - Triode_Kingdom 08:15:41 05/19/23 (0)
- RE: Have to Disagree - Tre' 13:41:55 05/15/23 (0)
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