@ willgolf
your hum , it seams to me like you have a DC voltage on your mains, or picking up some sort of RFI or EMI.
And it could be, that the helix design does not filter any.
A power cord that does a kind of filtering could be a multi wire cable with “ cross-connections” of the wires.
I have good results with a 7 wire standard Ölflex CY 110 cable, 7G1,5.
It has 1 centre wire and 6 wires around this centre wire. G1,5 means, each wire is 1.5 sqmm (15 AWG).
Cross-connection means, you use from the outer wires no.1,3,5 and connect them to L, and wires 2,4,6 to N. The centre wire I only connect to ground on the mains plug, not the IEC plug.
This makes up to a 3x 1.5sqmm (4.5 sqmm) power cord. The CY 110 is shielded and the shield I only connect to main plug.
If your amps have an earth pin on the IEC inlet, you need to add a ground wire, min. 4.5sqmm, which I run on the outside around the cable.
It is a PVC insulated standard stranded industrial cable. Connected to good power plugs and giving it more time to burn in, you can get a really good performing power cord at a very low price.
The cable costs just 5-10€/m + plugs.
Since the wires are multi-strands, it sounds more “airy” than solid core, but not as tight as the OCC solid core. (After min 200h burn-in; I put them 2 week on my fridge before I put them in my stereo)
I use these on my HT Receiver and like them more than the Helix PCs in this application because of its “Shielded”design and the “filtering” effect.
Best IEC plugs would be FIM (not available any more), or SonarQuest silver.
your hum , it seams to me like you have a DC voltage on your mains, or picking up some sort of RFI or EMI.
And it could be, that the helix design does not filter any.
A power cord that does a kind of filtering could be a multi wire cable with “ cross-connections” of the wires.
I have good results with a 7 wire standard Ölflex CY 110 cable, 7G1,5.
It has 1 centre wire and 6 wires around this centre wire. G1,5 means, each wire is 1.5 sqmm (15 AWG).
Cross-connection means, you use from the outer wires no.1,3,5 and connect them to L, and wires 2,4,6 to N. The centre wire I only connect to ground on the mains plug, not the IEC plug.
This makes up to a 3x 1.5sqmm (4.5 sqmm) power cord. The CY 110 is shielded and the shield I only connect to main plug.
If your amps have an earth pin on the IEC inlet, you need to add a ground wire, min. 4.5sqmm, which I run on the outside around the cable.
It is a PVC insulated standard stranded industrial cable. Connected to good power plugs and giving it more time to burn in, you can get a really good performing power cord at a very low price.
The cable costs just 5-10€/m + plugs.
Since the wires are multi-strands, it sounds more “airy” than solid core, but not as tight as the OCC solid core. (After min 200h burn-in; I put them 2 week on my fridge before I put them in my stereo)
I use these on my HT Receiver and like them more than the Helix PCs in this application because of its “Shielded”design and the “filtering” effect.
Best IEC plugs would be FIM (not available any more), or SonarQuest silver.