**The HELIX IMAGE Power Cable

DIY Power Cables - The "HELIX IMAGE" Power Cable

The “HELIX IMAGE” power cable represents several years of researching different cable architectures and materials.

I started looking at cable architectures a while back, initiated by an experience with a home lighting repair.

I was installing a new two way switch on a hallway light, the type with a switch at each end of the hallway (see diagram below). I decided to play it safe and use my multimeter to verify the open/closed position of the switches.

With the switch in the OFF position everything checked out, but with the switch in the ON position I found that there was a reading of 42 volts on what was supposed to be the "dead conductor" i.e. the red conductor in the diagram below.

page1image6056


I subsequently found articles on the web which verified that in this particular situation it is common for one of the conductors in standard household power cable to register an "induced voltage".

In the case of “conventional” power cable architectures, the live conductor and the neutral conductor tend to be side by side in extremely close proximity for the length of the cable, so is it reasonable to assume that noise will be induced between the conductors in a power cable?.
Would “noise pollution” also be present on the ground conductor, which, and depending on the design of a components circuit, might also have an adverse effect on sound quality?

Additional research revealed even more to consider regarding good cable design...

For more information on cable design issues please read the three articles below that talk about the many problems that challenge cables designers.

They will provide a great deal of insight into the many parameters and design techniques employed to build cables that excellent in their performance.

The articles are specific to Interconnect and speaker cables, but much of the theory also applies to power cables


https://www.psaudio.com/article/cables-time-is-of-the-essence-part-1/

https://www.psaudio.com/article/cables-time-is-of-the-essence-part-2/

https://www.psaudio.com/article/cables-time-is-of-the-essence-part-3/



The premise of the helical design concept eliminates the parallel conductors which minimizes cable issues to imperceivable levels!

BONUS! - the Helix acts as a Faraday Cage just for the signal wire!



But First My Disclaimer:

DO NOT attempt any of the assemblies detailed below unless you are an experienced
Electrical Professional OR Electronics Hobbyist - otherwise consult a technician!

YOU ARE RESPONSIBLE: for following local electrical codes. Failure to do so may result in personal injury, damage to equipment, or power cable failure which can result in fire.

YOU ARE RESPONSIBLE: for ensuring the cable selected is suitably rated for the power requirements of the component(s) it will be attached too !

YOU ARE RESPONSIBLE: for ensuring the IEC/Mains connectors are installed observing the correct polarity !
- failure to do so can result in poor operation, component failure or electric shock.


YOU ARE RESPONSIBLE: for ensuring the dielectric strength of the insulation on ALL conductors used, meets or exceeds local codes!

e.g. In North America - 600v at 200 Celsius for 120v 50/60 Hz supply


These Power cables are only to be used for
Home Audio Purposes and must not subjected to harsh environments and frequent handling, which generally require additional protective coverings.

The materials mentioned below comply with most codes for NORTH AMERICA ONLY!

Electrical codes in other countries may require the selection of different materials, therefore
YOU ARE RESPONSIBLE for following those local electrical codes.

YOU are responsible for ensuring “power related” assemblies are safe to use!

So what’s changed???
Since there is very little actual difference from a geometry perspective between the previous versions of the power cable and this renamed version I considered not assigning a new name, but then I realized

  • The Helix neutral has a larger diameter
  • the expandable sleeve over the cable assembly has been removed
  • the expandable sleeve on the Live Wire has been removed

Why remove the sleeve?
The nylon sleeve and heat shrink increases the Dielectric Constant (D.C.), which impedes cable performance

The only design element present in the other HELIX IMAGE cables which helps reduce D.C that has not been applied are the wood beads to centre the live wire in the helix.

As it turns out, removing the expandable sleeve, all of the heat shrink sleeve and increasing the diameter of the helix, seems to have elevated the performance of the power cable to similar levels of performance as the other HELIX IMAGE cables

And so the Power Cable inherits the HELIX IMAGE nomenclature !


What size wire do you recommend for various components?

I have found that using the 12 gauge Duelund wire will suffice for the most demanding components (e.g. amps up to 600 watts).

For Source components up to 40 watts I have constructions details further down this page that uses an 18 gauge solid silver wire that provides exceptional performance.

You can use 16 gauge Duelund wire for most lower powered Source Components up to 60 watts with additional cotton sleeve as detailed below for the Solid Silver live conductor.

IF you have
very powerful amplifiers (ie. in excess of 600 watts) and you are also using low impedance speakers (e.g. 2-4 Ohms) you may want to consider using...

  • 2 x12 gauge (i.e. 9 gauge equivalent) Duelund wires for the live wire and
  • 3 x 12 gauge Mil-spec wires for the neutral



Materials...

The materials listed below will build a 5ft power cable that is suitable for use with Power Aimplifiers rated up to 600 watts.

  • LIVE Conductor: Duelund stranded 12 gauge wire with Polycast insulation
    • However, if you want a more budget oriented power cable you can use 12 gauge Mil-spec wire from Take Five audio
  • NEUTRAL Conductor: 30 feet of stranded Mil Spec 12 AWG Silver Plated Copper Wire, Cryo Treated, Red - available from Take Five Audio (TFA)
  • GROUND Conductor: 15 feet of green 12 gauge mains copper wire from Home Depot
  • 2 feet of 1” black Heat Shrink sleeve
  • 1 Pair of SONAR QUEST CRYO Ag Audio Grade Silver plated IEC plug + US main plug
  • eutectic solder suited for electronics use - or WBT 4% silver solder can also be used
  • 10-12 gauge copper spade/fork connectors
  • For Spade/Fork terminals take look at the Grainger Web site and in their options check box select TERMINAL TYPE: Standard, WIRE RANGE: 12-10 gauge, INSULATION TYPE: Bare and SEAM: Butted
  • Fork Terminals - Spade Terminals - Grainger Industrial Supply
  • 1 5ft x 3/8”(10mm) or 1/2” (12.5 mm) fibreglass rod - available from Home Depot

Screen Shot 2015-11-15 at 4.31.10 PM

The Sonar Quest connectors have heavy Silver plating on pure copper contacts that provide excellent clamping and transmission of electrical current - available from ebay

I use an approximate ratio of 3:1 of Ground/Neutral:Live conductor

e.g. for a 5ft power cable I use 15ft of Ground and 30ft of Neutral Conductor



How To Make Them...

To determine the “Direction” of the Helix - see Inside The Helix Geometry.


The Neutral Conductor...

The Neutral Conductor is made from two lengths of the Mil Spec 12 AWG Silver Plated Copper Wire listed above.

Why two pieces? - this effectively make the neutral wire a 9 awg conductor, which I have found performs much better than a single 12 gauge wire, resulting in faster dynamics, better bass performance and control and more natural imaging.

Cut the 30 ft length of wire into two equal length pieces.

On the 3/8” or 1/2” rod, wind the neutral conductor in a helix configuration, space the windings about 1/4” apart and remove from the rod.
Repeat the winding process with the second piece of wire.

pc1


With the second coil of wire still on the rod...
- Attach the first coil to the second coil with a 10 gauge spade connector
- Wind the first “coil” of wire between its windings as shown below

Remove the two “intertwined” coils from the rod

pc2


The Ground Conductor...

On the 3/8” or 1/2” rod, wind the green GOUND conductor in a helix configuration, space the windings about 1/4” apart and remove from the rod.

pc3


Attach a 12/10 awg spade connector on one end of the Live conductor, crimp and solder in place.

Thread the Live conductor through the centre of the red coil(s)

Attach a second 12/10 awg spade connector on free end of the Live conductor, crimp and solder in place.

Attach a second 12/10 awg spade connector on the two free ends of the neutral conductor, crimp and solder in place.

Wind the green wire between the “double winding” of the neutral conductor as shown below.

Place 12/10 awg spade connectors on both ends of the ground conductor, crimp and solder in place


pc4



Cut two adequate lengths of 1” heat shrink tubing and place over each end of the cable assembly to provide a surface for the plug clamp


Here are two of my power cables positioned on cable lifters...

PC 001

NOTE: When Attaching the Sonar Quest connectors to the cable assembly...

PLEASE ensure you adopt the correct polarity - your life may depend on it!!!



Mains Polarity




Assembly Notes...

Why do I use spade connectors? -

  • First, trying to attach the mains/IEC connectors to a large gauge cable is very difficult,
  • More importantly - the spade connectors prevent detachment from the connectors in the event of unforeseen stress being placed on the connectors.
  • I have also found that the spade connectors that are crimped and soldered actually improve sound quality.

For a more secure crimped joint, I always crimp from the back - as shown in the image below, which prevents the collar from opening.

Crimp-022


I use pliers as shown in this image that applies an extended crimp along the whole length of the spade connectors collar

imgres


Cables that are more suited to source components can use lighter gauge conductors, but be sure to determine their power requirements and select a gauge that can handle it with headroom to spare.

Can you use other brands of IEC/Mains connectors?


Of course. Some people might prefer to use Furutech, or Oyaide high quality connectors.

Others may prefer to use something more reasonably price, like the Vanguard range of connectors.

I believe the Sonar Quest connector line provides exceptional sound quality for a reasonable price.

Power Cables for my Source Components...
Most “Source components” - like CD players, phono stages, DACs, etc.. draws significantly less power than amplifiers. They typically consume up to 40 watts

So, they do not require a 12 gauge power cable !


Most source components have a “less capable” power supply than amplifiers.

So their performance can be improved using a better “quality” power cable !


The following are details for building the
HELIX IMAGE - SOURCE power cable as follows...

  • The neutral wire is dual 14 gauge silver plated Mil-spec wire
  • The ground wire is a single 14 gauge copper wire - I now use the Mil-spec wire - it retains the coil shape
  • for neutral and ground wires - use a ratio of 4:1 neutral to signal to provide adequate helix coverage
  • The Live conductor is an 18 gauge solid silver wire from VH Audio - with mains insulation, i.e. 600v
  • you will also need cotton sleeve to space the live conductor evenly within the Helix coil
The construction techniques are almost identical to the standard HELIX Image power cable above with the following modifications.

First - the 18 gauge Solid Silver wire with the AirLok insulation can be purchased from VH Audio...
https://www.vhaudio.com/unicrystal-occ-silver-wire.html?gclid=EAIaIQobChMI-JqsneOm6AIVzP_jBx0yAw1IEAAYASAAEgIRovD_BwE

NOTES:
  • The AirLok insulation of this wire is rated at 600V and has a lower Dielectric Constant than Teflon
  • DO NOT use wire with cotton insulation - they are not rated for mains use in power cables

So - for a 5 ft cable you will need...
  • 2 x 20 ft of 14 gauge Silver plated Mil-spec wire from Take Five audio
  • 1 x 20 ft of 14 gauge Silver plated Mil-spec wire from Take Five audio
  • 5 ft of UniCrystal OCC .99999 Silver Wire - AirLok Insulation
  • 11 ft of 1/8” cotton sleeve
  • 14 and 18 gauge Spade connectors - auto supply stores normally have very cheap spade connectors
  • a small length of 1/8” heat shrink tube with adhesive
  • some masking tape
  • quality solder - I now use eutectic solder, but high content (e.g. 4%) silver solder can also be used

Follow the instructions above for creating the neutral and ground helix coils

The LIVE wire takes a little morw effort...

Cut the cotton sleeve one inch shorter than the live wire and thread onto the wire
Using a small piece of masking tape, secure the cotton sleeve to the wire
Power 6

Thread the second layer of cotton sleeve over the first layer
- this is more difficult, but only thread about 1” at a time

Power 5

Note: the length of the second layer of Cotton sleeve expands, so a slightly longer length is required

REMOVE the masking tape !

Both ends should look like this...


Power 4

Cut a 3/4” length of the Heat Shrink (with adhesive) and stretch one end, using a pair of needle nose pliers

Power 3

Place the heat shrink over the double layer of cotton sleeve

Power 2

Apply heat to secure the cotton sleeve to the wire with the heat shrink
- try NOT to burn the cotton sleeve
Power 1

Thread the live conductor into the Helix neutral and ground assembly and attach the spade connectors to each end

Attach the mains connectors and you are DONE!

So why do they work?

The power supply of an amplifier tends to be very well designed and built, because of the power requirements at play, whereas the more affordable source components, tend to be built to a price point and therefore the power supply is very often not as “capable” as the rest of the circuit.

The rest of the electrical components are very often just as capable as those in the amp, but in operation, their performance is impacted by the inadequacies of the power supply.

So if you use a very good power cable on a source component you can mitigate some of the inadequacies of its power supply.

The solid silver wire used for the Live conductor has an IACS rating of around 106% compared to copper at 100%


What is IACS? — it’s a measure of the conductivity of various metals relative to “Pure Copper”, a standard developed for copper wire producers, annealed copper having a rating of 100%

So the silver wire in these cables is able to respond more quickly to transient signal demands.

ALSO - the insulation on this particular silver wire has a dielectric constant (D.C.) of 1.4, compared to Teflon at 2.1.

The continual change in polarity of the alternating current charges and recharges the insulation much like the dielectric in a capacitor, which induces noise into the conductor. A lower D.C reduces the amount of noise generated internally within the conductor itself.

However, solid silver wire is very expensive, and I am a frugal being, which is why I have only selected it for power cables that will be used only on my source components.

But you could use multiple strands of the solid silver wire for the live conductor to increase the current handling capability - e.g. 4 x 18 gauge strands would equate to a 12 gauge conductor

What improvements did I observe?

  • There was a significant improvement in the details of “venue acoustics” - i.e. echoes and reverberations
  • dynamics were noticeably crisper
  • the image was noticeably larger front-to-back and there was more precision of artist location within the image
  • there appeared to be more “air” around each performer
  • clarity was improved, i.e. you could hear more of the fine details and layers within the music

I recommend making the single 18 gauge cables...


ONLY - if your component draws less than 40 watts - WHY?

The 18 gauge solid silver wire is rated at around 1 amp - HOWEVER - transient spikes can result in significantly higher current draws, which can impact performance or even overheat the cable.

For components rated BETWEEN 40 - 80 watts - use 2 x 18 gauge SOLID SILVER WIRE (effectively 15 gauge).

FOR USE WITH AMPLIFIERS
- you could use 4 X 18 gauge wire for the live conductor - that would effectively make it 12 gauge conductor.

Can I just Upgrade an existing 12 gauge HELIX Power Cable?

Yes - just replace the 12 gauge Live conductor with a single 18 gauge conductor
- HOWEVER - mark the cable in some way to identify that it has the small gauge live wire that is NOT suitable for amplifiers

NOTE: The 12 gauge wire used for the neutral and ground wire when upgrading a 12 gauge power cable in this manner, is NOT detrimental to cable performance if using the 18 gauge live conductor.

The Journey...

I’m a frugal person with a distinct dislike of overpaying for something as simple as a piece of wire!


I started making my own cables many years ago from Bulk cable with reasonably priced connectors.

I first tried Furutech bulk cable and then stumbled upon DH Labs, which I believe offers similar performance for about 1/3 the price - how could you not like that.

I then investigated a braided architecture which proved very effective, even using plain old Romex house wire.

Finally, I tried the Helix Architecture, which has proved to be the best performing power cable architecture to date.

I have now implemented this architecture on all my cables that have anything to do with audio.

What do they sound like?

The “HELIX IMAGE Power Cable” is a high performance power cable that allows connected components to perform to the best of their abilities.

They assist components in delivering ultra fast dynamic performance, exceptional clarity, expansive imaging and a very deep and exceptionally well controlled and very natural bass performance.

How Long is the Burn-In Period?

It is imperative that these cables are allowed adequate time to settle and burn-in...

  • they will sound extremely good on initial installation
  • after about 60 hours they allow more of the micro details in the form of venue specific reverberation captured in live recordings, or applied by very talented sound engineers, to clearly be heard.

The end of the Road?

My hope is that this design will be embraced and enhanced by the DIY Community and encourage them to experiment with different conductor materials and configurations to tailor the sound to their own liking.


For Helix cable spec’s please see Its More Than Just Numbers - Isn't It?

My Review System:



page6_blog_entry61-page6_blog_entry60-page6_blog_entry52-page6_blog_entry40-two-thumbs-up-2 Give them a try - and - Enjoy The Music! Happy