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Is there a DIY thread from back in the day? Anyone know?
Thanks. You literally plug the thing into the wall where your equipment goes. Seems way easy. Never did see if anyone uses a fuse or not...I can't imagine not using one.
I must be missing something?What do a choke designed for high voltage, low current DC power supplies have to to with AC line power?The old linked thread is way to long on posts and way to short on safe useable information.
I borrowed a pair of 193m's from Big Red Machine to try with my SS Mono amps, and tried searching for an answer but no luck. Both chokes have a pigtail thingy, and i am using two outlets (one for each amp). It looks like the pigtail plugs into the amp, amp power cord to the end that plugs into the amp, and I assume the other end is where the choke would plug into? However, is it appears some people plug the choke into the same outlet as the amp. I'm not sure what to do, any help would be greatly appreciated.Pete is out of town, so I can't ask him. I will be returning the chokes next week and would like to be sure I went about things the correct way.Mark
As you probably already figured out you put the leads on the choke, thingies, in a male a/c industrial grade plug. I got mine at Lowes for around $9, which are returnable if the chokes don't meet your expectations.
Mine just has two black wires; one goes to the line plug terminal and one to the neutral plug terminal.
OK, so I read the linked thread, and I still don't understand any of it.
Wow, this is a really old tweak, and a good one IMO. I'm kind of surprised that some of the regulars here have never heard about it. Here are two of many posts from AudioAsylum, which try to explain what is going on with a choke across the AC line :http://db.audioasylum.com/mhtml/m.html?forum=tweaks&n=146122&highlight=Hammond+193&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fforum%3Dtweaks%26searchtext%3DHammond%2B193http://www.audioasylum.com/audio/tweaks/messages/17/172219.htmlAs for the fuse, Richard Gray used to supply their units with a fuse. I think they have moved to a magnetic circuit breaker now. This is probably the only way they can sell the product UL listed.
here is a quote from Al S. from the above link:"These devices have significant low frequency winding resistance (57 ohms for the 193L and 63 ohms for the 193M), so they do not present a short-circuit to high frequency noise. They appear to work by damping high frequency resonances with the winding resistance, as the core behavior drops out above about 5 KHz."Now Al is a pretty knowledgable dude, and the wording above does not inspire much confidence in how a choke used in parallel "appear(s) to work". Or if it really does anything at all.
Simply wire it to a line cord and plug it in to your audio circuit. It will improve the sound if you have RF noise on the line. You can spend a lot more money for slightly better performance.
I don't have a 193L handy, but I do have a 193H. I connected it to a resistor and a signal generator, and swept the frequency. The choke impedance rises with frequency to 5 KHz, then it drops.Many power transformers I've tested this way have a maximum frequency in the 40 to 100 KHz range, so Alan is correct that the Hammond chokes are superior as AC noise filters. However, the real reason they work so well is that their cores are not built for wide frequency response
I found that I have a pair of Hammond 193H chokes acquired for another project. These are 200 mA instead of 300 mA, but are the same inductance (5 H). The DC resistance is 65 ohms instead of 57 ohms.I wired these up with junk cords and plugged them in to the circuits feeding my Atma-Sphere MA-1 monoblocks. There was an immediate improvement in the midrange. It became easier to hear the separate piano strings in the decay of notes on Shirley Horn's _You Won't Forget Me_.
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