Chokes Designed for Choke Input PSU's - diyAudio
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Old 24th October 2007, 10:51 PM   #1
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Default 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.
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Old 24th October 2007, 11:03 PM   #2
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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.
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Old 24th October 2007, 11:13 PM   #3
Tweeker is offline Tweeker  United States
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Electra Print offers chokes and custom chokes in the US.
Be sure your foil hat has a good low impedance ground.
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Old 24th October 2007, 11:16 PM   #4
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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.

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
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Old 25th October 2007, 05:28 AM   #5
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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.
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Old 25th October 2007, 05:33 AM   #6
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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
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Old 25th October 2007, 09:44 AM   #7
tbr is offline tbr  Switzerland
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Lundahl chokes work here very good, too. Maybe a tad expensive, but very quiet!
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Old 25th October 2007, 09:54 AM   #8
Trout is offline Trout  United States
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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.

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