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In Reply to: RE: Hammond 193L newbie impressions posted by email@example.com on May 07, 2009 at 04:40:56
The chokes used are 5 Henrys or greater, so their impedance at 60 Hz is greater than 1800 ohms and the current at 120 volts is less than 64 mA (reactive).
These chokes look like power transformers but without secondary windings. Their parasitic capacitance is what makes them act as filters for high frequency electrical noise.
You may add a fuse if you like, but be aware that many fuses degrade audio performance.
At 60 Hz, a 193L just sits there in parallel with a reactance of 3015.33 Ohms.
We are talking steady state behavior, not transient.
It's probably the 'shock absorber' properties that make the difference you are noticing to line transients ?
The 193L will make the power factor ever so slightly more inductive, for whatever this may do to the loads in parallel. Maybe irrelevant.
Whether this makes an improvement, is probably another audioasylum subjective tweak.
Think of it's analogue as a capacitor charging up to a steady state DC value. Then what ?
My only question remains, why 193L ? Why not a smaller or larger value inductor ? Is that exact value of L important, and why so?
I fail to connect this tweak with the behaviour of an inductor at 60 Hz, to me it seems like the an "emperors clothes" tweak.
Inductance is almost always applied in series to choke out HF noise in power conditioners. Not much happens electrically in this scenario, apart from a very small increase of an almost un-measurable power factor degradation.
When you factor in the rest of the active residential AC loads, it get's lost in translation so to speak.
The fuse is for safety.
You can use a 1/4 amp or less, simply to protect the rest of the equipment in parallel.
The AC branch circuit breaker on the outlet may not trip in time if the 193L happens to short, unlikely, but then we have fire extinguishers handy when we least expect to need them.
I forgot to add...
If the Parasitic Capacitance of the 193L Inductor (have you determined this value empirically?) is what makes the tweak work, there are dozens of Power Conditioners out there that have capacitors in parallel that provide all of the benefits you are striving to achieve (it seems.)
What then make the parasitic capacitance of an inductor so special?
Why not just put a capacitor in parallel ?
Just curious to understand the rationale here.
You have some Inductive reactance at 60 Hz doing nothing and the parasitic capacitance it has doing something.
Seems like a cheap tweak if you have a stray choke "inductor" handy to act as a surrogate parallel capacitor.
Could be expensive mail order for a 193L Hammond if you don't.
Something just doesn't add up here, or maybe none of the above matters in the search for the line conditioner tweak of the century.
Even though I am skeptical, I am going to try this tweak when I get home in early june.
Sometimes the science and the results don't correlate somehow in the tweakers world.
I have the largest Hammond Choke they sell I bought years ago, a 193Q.
Do you think that this 10H, 500ma choke is OK as compared to the model you are using ?
Will report back what improvements I can perceive with a before-after test.
Fuse vs. sonics is a debate I choose to stay away from. In my mind safety first.
The chokes I've seen have resonances around 5 KHz, IIRC. This means they look like capacitors above that point. The capacitance involves the magnet wire insulation and air, and it likely has fewer problems than the typical synthetic polymers (polyester, polypropylene) used in line-rated suppression caps.
The size of the choke determines the magnitude of the parasitic capacitance and the winding resistance. The smaller chokes seem to be less effective, so your big one should work as well as or better than the typical 193L.
I don't use chokes in my setup, as I've found good performance with R-C filters using the Wima metallized paper line-rated suppression caps.
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