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Old 21st February 2012, 02:12 PM   #1
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Default Heater wiring idea?

Hey there,

looking around in the lab I had another idea concerning heater wiring - probably someone has already tried, but I didn't find anything in the forum:

MJ says in his books that heater wiring should be twisted as close as possible ie. as close as the insulation allows.

What about using magnet wire / enamelled copper wire with sufficient cross section for heater wiring? Due to the very thin insulation layer, it should be possible to get a very thight twist with that.

What do you think?

Best regards,
Andreas
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Old 21st February 2012, 03:03 PM   #2
lechuck is offline lechuck  Netherlands
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Hi Andreas,

I have never tried that type of wire for heaters, but heck its DIYaudio so give it a try ;-)

Personally I am using regular solid core UTP wire for most heaters (2A AC seems to be no problem for this wire). I twist my wire by using a drill, the wire gets twisted evenly and is very tight.

Regards,
Anthonie
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Old 21st February 2012, 03:06 PM   #3
jrenkin is offline jrenkin  United States
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I would worry that the enamel would fracture when twisted really tight.
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Old 21st February 2012, 03:46 PM   #4
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@jrenkin agreed! also if a drill is used then the issue of stretched coating can arise..I would not use enameled wire but do try it out
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Old 21st February 2012, 03:54 PM   #5
M Gregg is offline M Gregg  United Kingdom
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Just my thoughts,

Not a good idea..The current is an issue and heat at the termination. Also do you have fuses in the heater circuit because its a sure way to stuff the power Tx with a short..It tends to happen very fast with a poof of smoke and the TX is stuffed.. The insulation is not meant for this kind of application.

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M. Gregg
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Old 21st February 2012, 04:22 PM   #6
M Gregg is offline M Gregg  United Kingdom
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If you want to improve heavy or signal heater connections,

Use silver plated PTFE single core, It has a smaller cross section for the same current and can be twisted quite close..You have to use common sense with the compression with a drill. However its far better for both power and pre tubes.

Also the insulation is better with heat than PVC.

I guess I should add you can use Example (Three strands of red and three of white and twist togeather make the three red off as one cable and the three white as the other) You have a high current "flexible" heat resistant high current cable.
Small flex is also good (silver plated PTFE)..It dosen't stay in place quite as well..

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M. Gregg
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Old 21st February 2012, 04:34 PM   #7
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I wouldn't worry about this too much. Almost any wire that can pass the power and be twisted is ok. Run it near the chasis corners, stay away from grid wires and keep it tightly twisted up to sockets.
Proper layout is way more important and DC for heaters might help. But for simple diy preamps and amps AC heaters are enough.
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Old 21st February 2012, 05:27 PM   #8
DF96 is offline DF96  England
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Uniformity of twisting is probably as important as tightness, and layout as others have said. It would be poor engineering to concentrate too much effort on just one parameter, especially as that carries risks of shorting.
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Old 21st February 2012, 07:14 PM   #9
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Meh...

Thought it would be a great idea - but no one likes it *sniff*

Guess I'll use plain insulated wire as everyone else then...

Best regards,
Andreas
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Old 21st February 2012, 09:45 PM   #10
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Rundmaus View Post
Meh...

Thought it would be a great idea - but no one likes it *sniff*

Guess I'll use plain insulated wire as everyone else then...

Best regards,
Andreas
LOL,

Well it was a good try..

Regards
M. Gregg
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