My latest amp project is a 6C45 choke loaded driving a 211, B+ is 800vdc, driving the 211's at 60ma.Thus far I'm very pleased, but am getting a small amount of buzzing from the first choke.
Power supply is 1650vct --> 866jr's --> 6CG3 --> Swinging Choke ---> 15uf oil ---> Smoothing Choke --> 30uf oil. There's a 100K bleeder to keep the power supply in "choke loaded mode".
Both chokes are old stock Thordarson, rated at 350ma, well behind both the DC + Peak AC draw, so shouldn't be anywhere close to saturating.
Digital delay powers the 211's, 6C45's and 866jr's first, then brings up the B+, 6CG3 and 6106 (for driver stage) once the mercury has vaporized.
Ironically the buzz from the swinging choke is louder than the hum from the AC filaments.
Changing the choke would be tough, as the chassis is a tight fit, so I'm looking for other solutions.
I'm toying with either a snubber across the first choke, or a small cap in front of the first choke. I don't really want to up the B+ but have a bit of room (caps are rated at 1000v)
Any idea which (if either) would work best, and how to pick the correct cap value (and appropriate voltage ratings)??
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Topic - Choke Filters, and the Buzz... - Gary Kaufman 13:44:19 02/8/03 (21)
- Re: Choke Filters, and the Buzz... - mrfixit 11:35:41 02/9/03 (2)
- Re: Choke Filters, and the Buzz... - Gary Kaufman 12:02:40 02/9/03 (1)
- Re: Choke Filters, and the Buzz... - mrfixit 12:24:27 02/9/03 (0)
- Re: Choke Filters, and the Buzz... - Gary Kaufman 19:36:42 02/8/03 (4)
- Gary! what type of caps you use for snubbing across the chokes <nt> - Tanker 08:39:52 02/10/03 (1)
- Re: Gary! what type of caps you use for snubbing across the chokes <nt> - Gary Kaufman 14:33:10 02/10/03 (0)
- Re: Choke Filters, and the Buzz... - Brian C. 03:07:20 02/9/03 (1)
- Re: Choke Filters, and the Buzz... - Gary Kaufman 11:52:40 02/9/03 (0)
- Re: Choke Filters, and the Buzz... - Eli Duttman 17:16:10 02/8/03 (0)
- Re: Choke Filters, and the Buzz... - electronluv 15:29:51 02/8/03 (1)
- Re: Choke Filters, and the Buzz... - Gary Kaufman 19:31:41 02/8/03 (0)
- Re: Choke Filters, and the Buzz... - electronluv 15:23:19 02/8/03 (4)
- Re: Loctite Green - Topper 18:19:37 02/8/03 (0)
- Loctite 609 is a fine wicking glue too - Sector-7G 17:56:39 02/8/03 (2)
- Anaerobic adhesive - Andy N 07:58:02 02/9/03 (1)
- Re: Anaerobic adhesive - Sector-7G 15:00:21 02/9/03 (0)
- Re: Choke Filters, and the Buzz... - Vinnie 14:45:40 02/8/03 (2)
- Re: Choke Filters, and the Buzz... - Gary Kaufman 19:11:37 02/8/03 (1)
- Re: Choke Filters, and the Buzz... - Vinnie 15:11:04 02/9/03 (0)
- Re: Choke Filters, and the Buzz... - Vinnie 14:35:57 02/8/03 (1)
- Re: Choke Filters, and the Buzz... - Sector-7G 14:48:43 02/8/03 (0)