Duelund conversion to DIY Helix Geometry Cabling

@williewonka, Hi Steve, a friend has asked me to make speaker cables for his system. The speakers are my design at 96dB sensitivity and driven by a Manley Stingray tube amp providing 40W ultralinear and 25W triode-connected which is how it is always used.

I have some Acoustic Revive cable which is twin 19awg. The red insulation they use is very easily removed by simply freeing one end and pulling, so no nasty nicks from a trim blade. Used as the live = 16awg with 16awg TFA wire for neutral. Would this, in your experience, be enough to adequately drive the speakers? If not I could add a 3rd wire the same as the other 2 bringing the copper cross section of the live wire to 1.96mm sq. closer to 14awg. This is more trouble and expense but will do if that’s what is needed.

While shopping for ptfe tube I came across some ePTFE which is aerated. I emailed them for the Dk which they claimed between 1.3 - 1.5. It may be useful.

@lemonhaze - the 16 gauge signal would be fine, but I would double up on the neutral. The Helix works best if the neutral is a heavier gauge than the signal conductor.

or buy some 14 gauge from TFA

regards

@williewonka thank you for your help.

Do you think doubling for xlr would be as interesting as it is with RCA?

@abolive, double signal wires for sure, but I found doubling the neutral on the single ended RCA cable only made a marginal improvement.

For me, the amount of improvement did not justify the additional effort, complexity and expence.

If you are intending to use a two wire signal conductor would make sure each signal wire is twisted in opposite directions and insert each conductor inside a cotton sleeve.

Is the budget allows use solid  occ silver

Regards, Steve

@williewonka, thanks. I have just enough TFA 14awg to make a 2.5 : 1 ratio helix. Would this be detrimental in any way?  Unfortunately I don't have the time to order more.

A year ago when I ordered from TFA the package took 5 weeks to arrive. It gets to Dublin in a few days then goes on a tour of the country. Things happen slowly in rural Ireland. Our street has no name but our cottage does, An Acra Beag, which is Gaelic for 'a small acre'  Stuff gets delayed.

@williewonka   Thank you very much,

Yes I was thinking of doubling only the signal wires.

When you say twisting in opposite directions, it means clockwise for the +ve and the anti-clockwise pour the -ve?

@abolive - that is correct

@lemonhaze - the ratio, 2.5:1, will work well

.regards, Steve

@lemonhaze - actually, that ratio is what is posted on my website.👍

If required you could reduce it to 2:1, because unlike interconnects, where the signal and any induced noise would be amplified, making that noise an issue, whereas any induced rfi/emi induced into the speaker cable would not be heard above the amplified signal from the Amp, so the number of turns is not as important.

So, interconnects a ratio of 3.1 is recommended

And for speaker cables 2.5:1 is recommended

Regards

Thank you @williewonka 

@williewonka, great thanks. I will be visiting my home country South Africa for a few weeks and will take the speaker cables, a PC and a pair of IC's with. I will also be visiting my mates at 'the old farts club' a bunch of good guys who are not cable deniers and will be able to report on their impressions when I return. One of them owns Mark Levinson monos and Magico 5 speakers so it will be interesting and fun.

@williewonka you asked "Any Thoughts? Steve"

I know that there is a spirit of investigation on this thread and there will be discoveries made as a incremental way forward and quite possibly backwoods.

I introduced a individual to PC Triple C, they have not looked back, they also know my interest in Helix Design and FINEMET as an alternative to Ferrite.

With all the good things already happened they bought into SAEC SL 5000 Cables, which I feel ticks boxes in relation to my own interests shared. .

The Supplied RCA Connectors were compared to KLE RCA's and KLE were the chosen type.

The investigative mind did not rest and other RCA's were considered of which WBT Low Eddy was a selection.  

This RCA was the new chosen design and the idea to couple it to a purpose produced same design interface Connector took on a must try out on a list.

This is where I was introduced to the evolving use of SL 5000 CCC > OEM RCA  and SL 5000 CCC > WBT's. ( I missed the period of KLE's being in use)

I trust the system owners judgement and I know the system very well.

The WBT's used as a the Cable Termination and on Chassis has changed my whole thought process about what can be achieved and what really can be achieved, the impression left is very good.

Maybe it is just one of those leaps one has to take, there is also the analogy where if nothing is ventured nothing is gained.   

I have built the Helix cables for a few years now and have tried the many combinations suggested as they were made available on Steve’s site. I have recently switchover a Neotech 2 x AWG18 UPOCC power cable for a 14 AWG Duelund PVC on my Bryston 3.14 DAC streamer. I am quite surprised by the results. The Duelund seems to handle the sound texture way better than the Neotech version. Less harsh on the high frequencies, better instruments separation and a small increase in the spatial details department. My guess is that the cable type have more noticeable effects on low level source components than preamp and amp. Experimenting is the only way of finding what suits your ears.best.

@norco74 and @pindac - gentlemen, thank you for your posts above. They contain excellent information, in that they provide alternate thoughts/products/feedback for other readers to ponder and try out.

As I have said many time throughout this thread, if you have a favourite wire or connector, then try it. The forumala posted on my web site is just a starting place.

But for me it is also the final state of my nation. The expense (time and money) has been significant and I like the sound I now have, so for the time being I’m sitting back to enjoy the music.

I would encourage people to try different wies and connectors, because they all make a difference. You may find a combination that may or may not suit your ears, so be aware that it can be time consuming and costly in order to select te combination your ears find most satisfying.

The really nice thing is - the Helix Geometry makes those differences very noticeable, which makes everything a little easier.

Regards - Steve

Steve,

Please recommend optimum Inner diameter for PTFE tube to use with 14 AWG Neotech OCC solid core wire / with PVC Insulation which will be stripped out /

That will be used for producing Hellix speaker cable using 2 x 14 AWG Neotech Positive and 1 x 10 AWG Mil spec sivler plated copper wire

@sasho - please use this wire calculator in furure to calculate wire diameter

Wire Gause Calculator

As yu can see the diameter of the 14 gague wire wil be 1.6277 mm

so the inside diameter of the tube should bs around 25% larger, which is 2.034mm

You will not get an exact match, so opt for the one closest to the calulated amount

Regards - Steve

Regarding solid wire for power cables, aren't we afraid of possible failure? It is verboten by many country regulations 

@abolive - generally speaking - you are correct - i.e. for power cables.

Those regulations are primarily to protect the consumer and guard against cable/component failure

Any cable that connects a component to the mains for general sale has to conform to a set of guidelines that pertain to flexibility, insulations and current carrying capability, etc... This is because the regulators do not know what use/abuse that cables will be subject too. 

• e.g. there are cables that can withstand harsh chemical abuse - like Furutech - which is UL Certified
• but there are also cables designed specifically for audio use - such as DH Labs.- which does not appear to be UL Certified

The "deterrent" seems to be UL or CSA or BSA Certification, which is normally required by insurance companies. However - the power cable on that lamp from china sitting on oyur bedside tables is probably not UL certified

If you look at my website you will see warnonogs pertaiing to building the Helix cables.

Audio cables are not "generally" subject ot a lot of flexing. and the higher the quality of copper used will allow the capability to be flexed more often.

If you build the cable yourself you should have a pretty good idea of the kind of abuse it can take, so it is up to YOU to make sure it will perofrm well.

Solid wire can take a lot of bending and straightening before it fails, so it should be OK for audiophile use

Regards

@williewonka thank you for your reply, I feel reassured 😊

@abolive - just to assure you further - If you make a cable using good solid copper wire, the cable will adopt a "natural. curve" once attached to components.

You can of course use a tighter curve if space is a premium, but even a really tight bend in the cable should not approach the right angled  "L" shape reqquired to fracture the wire  when used under "Normal Use" 

To get copper wire to fracture, I had to use a pair of pliers and force an "L" shape in the wire, and then wigggle it back and forth several times

But to be on the safe side, just allow the cable to show you it's natural curve and use that

Regards - Steve