Chokes Designed for Choke Input PSU's

sorenj07 · 24th October 2007, 10:51 PM

Does anyone have any good recommendations? I'm looking to build an amp with approximately 150-170mA draw (four 6V6-types).. I've used Hammonds in all my amps and have found that they tend to make the chassis ring, or buzz loudly, etc etc.

Eli Duttman · 24th October 2007, 11:03 PM

Sowter (England) offers inductors specifically intended for choke I/P service.

The Hammond 193Q is a (sic) 21 lb. behemoth, which is rated for 500 mA. Even with a 50% derate, it should easily do the job.

Viscoelastic mounting is probably a good idea, regardless of the make of choke you use. The 1st inductor in a choke I/P filter works HARD.

Tweeker · 24th October 2007, 11:13 PM

Electra Print offers chokes and custom chokes in the US.

Bandersnatch · 24th October 2007, 11:16 PM

hey-Hey!!!,
The UTC CG-103 is a 250 mA swinger. 5-25 Hy between 250 and 25 mA. There are Triad endbell versions in 200 and 300 mA and these will do a significant fraction of that in DC output. I used a Triad C-19, a 10 Hy/300 mA choke with 400-0-400 into it, and it delivered 220 mA comfortably.
cheers,
Douglas

consider also the Chicago 8200, an 8Hy/200 mA device, by the indictance curve I saw, it will tolerate input duty w/o complaint at the level you propose.

ray_moth · 25th October 2007, 05:28 AM

Are you sure you need a swinging choke? To my knowledge, it's only really necessary if the quiescent current is significantly less than the full output current.

sorenj07 · 25th October 2007, 05:33 AM

I'm designing in full Class A, and I'm using a small "tuning" capacitor (2.88uF total) so I'm not completely sure that a huge choke is as necessary here as in other amps, but I'll definitely check out those recommendations. I wonder if Edcor makes chokes

tbr · 25th October 2007, 09:44 AM

Lundahl chokes work here very good, too. Maybe a tad expensive, but very quiet!

Trout · 25th October 2007, 09:54 AM

How about the Triad unit from allied electronics?

16.00 US.
Triad 200ma

I just bought a couple of these for replacements in Fender guitar amps.
Triad Magnetics
Inductor; 6H; Smoothing Filter Choke; 150Ohms; 200mADC; 2-19/32In.H; 4In.W; 2-1/4In.D

They stock others that may be useful also.
Chokes

Trout

24th October 2007, 10:51 PM	#1
sorenj07 diyAudio Member Join Date: May 2006	Chokes Designed for Choke Input PSU's Does anyone have any good recommendations? I'm looking to build an amp with approximately 150-170mA draw (four 6V6-types).. I've used Hammonds in all my amps and have found that they tend to make the chassis ring, or buzz loudly, etc etc.

24th October 2007, 11:03 PM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Sowter (England) offers inductors specifically intended for choke I/P service. The Hammond 193Q is a (sic) 21 lb. behemoth, which is rated for 500 mA. Even with a 50% derate, it should easily do the job. Viscoelastic mounting is probably a good idea, regardless of the make of choke you use. The 1st inductor in a choke I/P filter works HARD. __________________ Eli D.

24th October 2007, 11:13 PM	#3
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Electra Print offers chokes and custom chokes in the US. __________________ Be sure your foil hat has a good low impedance ground.

24th October 2007, 11:16 PM	#4
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, The UTC CG-103 is a 250 mA swinger. 5-25 Hy between 250 and 25 mA. There are Triad endbell versions in 200 and 300 mA and these will do a significant fraction of that in DC output. I used a Triad C-19, a 10 Hy/300 mA choke with 400-0-400 into it, and it delivered 220 mA comfortably. cheers, Douglas consider also the Chicago 8200, an 8Hy/200 mA device, by the indictance curve I saw, it will tolerate input duty w/o complaint at the level you propose. __________________ the Tnuctipun will return

25th October 2007, 09:44 AM	#7
tbr diyAudio Member Join Date: Dec 2003 Location: Swiss Pampa	Lundahl chokes work here very good, too. Maybe a tad expensive, but very quiet! __________________ Thomas

25th October 2007, 05:28 AM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Are you sure you need a swinging choke? To my knowledge, it's only really necessary if the quiescent current is significantly less than the full output current.

25th October 2007, 05:33 AM	#6
sorenj07 diyAudio Member Join Date: May 2006	I'm designing in full Class A, and I'm using a small "tuning" capacitor (2.88uF total) so I'm not completely sure that a huge choke is as necessary here as in other amps, but I'll definitely check out those recommendations. I wonder if Edcor makes chokes

25th October 2007, 09:54 AM	#8
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	How about the Triad unit from allied electronics? 16.00 US. Triad 200ma I just bought a couple of these for replacements in Fender guitar amps. Triad Magnetics Inductor; 6H; Smoothing Filter Choke; 150Ohms; 200mADC; 2-19/32In.H; 4In.W; 2-1/4In.D They stock others that may be useful also. Chokes Trout

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