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In Reply to: RE: $50 for the parts.... posted by Awe-d-o-file on July 28, 2016 at 19:31:03
I think Lloyd Walker deserves some credit for bringing this tweak into the public domain. It is audibly beneficial in my system. His stuff is often expensive but usually effective, in contrast to some others.
Follow Ups:
Lloyd does not deserve the credit. This simple circuit has been in use for a number of years. I have seen it implemented in amplifier output stages for many years. There was a company I think named Encom that offered them many years back as a add on to speakers. Basically a resistor/capacitor in series across the plus and minus terminals.
Edits: 07/31/16
They still made them a few years ago. Im pretty sure they used a cap and resistor in series like Walker.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Do you mean
I wouldn't guess that these are any cheaper than the HDLs.
The bare wire ones were a little over one hundred. Very basic wire and case. I think they are made in Asia, could be wrong.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Yep, I think I bought the Enacoms years ago for around $80. WAY cheaper than the Walker's. Don't know if they're as effective, but I'm not about to spend $700 to find out. The DIY option looks very interesting and a lot more practical from a financial stand point.
Yes you can beat the Enacom yourself for less than they cost using much better parts than they do.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Gonna do some for my system.
I know in the back of the Phase Linear PL400 there is a RC network that is very close in values to what has been recommended here. I know it's a Zobel but the values if I'm correct are either .1/.01uf with a 8ohm resistor on the speaker binding post. I have to double check. It's uses a Quasi-Complementary NPN output stage.
So I will do the one DIY version on your site with bare wire ends. :)
Not sure, but that network is probably there to keep the Phase Linear stable at very high frequencies and/or to protect the driven speaker from the oscillation of a Phase Linear if it goes unstable, which was known to happen if the load capacitance got to be too much for the amplifier.
Yo Cougar, I expect a full report!
LOL!
two 10 ohm (5 ohms) 1 watt resisters in Parallel and with a .1uf caps. So it's not as close in values as I thought. My Bad! :)
Hopefully this works out like everyone here who has made theirs.
What should expect or not expect to hear when I first connect them? more quiet background, depth or wider soundstage?
If they just brought the prices down to a reasonable level!
They have been around for a long time so I can only imagine that they are making the business model work AND they have some products that really DO work like the Walker SST silver paste. But it took me about 30 minutes to find an alternative that works just as well and that ounce for ounce costs a lot less!
I don't get it, but hey, if it's working for them and they have anough customers, who am I to judge? (I know...except I kinda just did...but I'm trying to be respectful here).
Your main point is probably correct; the idea is not terribly esoteric.
Agreed. I do have some clients that preferred my version to his. Auricap or Multicap RTX, Allen Bradley mil spec one watt carbon resistor, 12 gauge silver wire and Audioquest silver spades in a damped cardboard tube as a body with copper foil tape as a shield.
The resistor was the smoothest of all I tried. The caps were good but I didnt try crazy money caps. Al Sekela, who I was close with, told me about it. I have his parallel AC filter recipe too if you want it. Just email me.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
bless his soul RIP Al, miss you brother.
moray james
He was my mentor and I owe much to him. Thsnk you too.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Technically, a ceramic capacitor coupled with a carbon resistor would be the best choices, because they are stablest at RF. But no self-respecting audiophile would use such parts, regardless of the soundness of the theory. I use Russian SSG silver mica capacitors (because they too have a wide bandwidth before resonance, altho probably not as good as ceramic) and maybe a 2W tantalum resistor (can't remember). I taped everything to physically stabilize it, a la the wood case used by Walker HDLs.
I have not shielded mine. Nor do I think the HDLs are shielded, but maybe they are now you mention it. Did Al recommend that? If so, I will do it.
HDLs are enclosed on copper and yes Al recomended it. He was against putti g a drain wire from the copper to the ground terminal and I agree after trying both ways. Pictures of various ones I made on on the site. I also matched values on all parts and used good solder.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
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