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Old 28th April 2012, 09:14 PM   #1
Ducs is offline Ducs  Canada
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Default AC Line Filter

What do you guys think about installing a ac line filter before the power transformer. I am talking about something similar used in computer power supplies that doubles as a ac inlet. See pic below

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Old 28th April 2012, 11:06 PM   #2
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Some of the "Golden Ear" crowd seem to think that they muddle up the sound.

Personally,I'm all for them. Keep the nasty crap from all the switching supplies,out of my amp. Never really noticed a big difference in sound,with or without,but it's good peace of mind.
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Old 28th April 2012, 11:13 PM   #3
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I've got 'em in all of my tube amp projects; they were leftovers from old work prototypes. The ones I have are Schurter 4A rated medical jobbies.

One thing that I have wondered about using them is......although they may be rated for say 4A, you could easily have pulses of greater than 4A depending on the conduction angle of the power supply rectifiers & caps, and I have no idea if they are still effective at high (pulsed) currents.

I did not use one in my last project, a Mini-A from the Pass Labs forum. (Class A SS).
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Old 28th April 2012, 11:43 PM   #4
Ducs is offline Ducs  Canada
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Great...I am planning to use a Schurter power entry module with a switch, fuses and a filter - all in one package makes everything simpler and cleaner
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Old 30th April 2012, 03:27 AM   #5
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I don't build anything without a mains filter. Mains supplies are notoriously noisey. You want to keep that mains born noise out of your amp. This is particularly true when toroidal power trannies are used as they have huge bandwidth and noise couples to the secondary very well.
cheers,
Ian
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Old 30th April 2012, 05:07 AM   #6
Junm is offline Junm  Philippines
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Default noise filters....

i'm also planning to use these things.....are they good?
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Old 30th April 2012, 06:06 AM   #7
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Some may find interest in the following audioXpress articles by Ed Simon (aka simon7000) . . .
An On-Peak Power Supply, Pt. 1
A Line-Cleaning Filter, Pt. 2
An Isolation Transformer, Pt. 3

I went with the following as well as added varistors and surge absorbers. (Oh, and a pair of Bybee's for the overboard factor.)

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Old 30th April 2012, 10:05 AM   #8
kaputt is offline kaputt  Germany
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I used the exact thing pictured in my poweramp (300B-XLS SET). I than changed to an unfiltered socket and sound became much clearer and alive.
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Old 30th April 2012, 10:50 AM   #9
AndrewT is offline AndrewT  Scotland
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I have a variety from 1A to 6A fitted to all my audio gear.

I have a few high current common mode inductors to allow discrete building if I need more current ability.
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Old 30th April 2012, 10:55 AM   #10
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My opinion:
If you hear a difference between filtered and unfiltered comes because you know when the filter was there or not.
After rectifying there is a DC voltage on your caps, and there is no difference there with or without filter.
Since you amplifiers works on DC voltages, I think the sound difference is between your ears !
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