Twisting DC Heater Wire

[WntrMute2]

Is it necessary? I'm building a phono-stage and am wondering if I need to twist the D3A and 5687 heater wires?
TIA
Dave

 

[Lingwendil]

Not needed, but won't hurt anything.

 

[rayma]

Not really (unless there's significant ripple on it), but the wiring is still neater when twisted.

 

[cogsncogs]

I always twist 'em, whether A.C. or D.C. on the heaters.

 

[kodabmx]

Twisted AC is better than poor "DC" in straight lines... without a giant cap or a MOSFET pass filter (or an SMPS in the first place), most times you're better off with well twisted wire and AC current.

 

[scottjoplin]

Twisted is good practice in case there's any airborne noise.

 

[Mark Tillotson]

Twists will reduce/prevent both pick-up and outgoing interference, for DC heater wires only pick-up is possible of course as DC doesn't generate changing magnetic fields. Noise pickup on the heater is unlikely to have any effect for an indirectly-heated device.

 

[WntrMute2]

Thanks all. I think I'll twist them mostly as they will layout better. My first attempt with non-twisting them looked irregular and sloppy.

 

[Ti83]

It certainly makes the wires a lot stiffer and therefore easier to route. If the wires were thick (nice margin wrt to ampacity required) and solid (as opposed to straned) and otherwise thoughtfully restrained, I bet untwisted would be ok.

 

[AllenB]

Twisted is good practice in case there's any airborne noise.

It would be interesting to see some information on whether the common mode C_hk route is more of a concern than the heater current mode.

 

[wiseoldtech]

As was and IS good practice when running heater wiring, particularly with preamp circuits, twisted pairs AND routing/dressing intelligently is the best result.
Down against the chassis, away from signal wiring.
It's the way that its been done for decades.