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Old 7th July 2010, 09:46 AM   #1
ervinl is offline ervinl  Indonesia
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Default Small Tube Pre Amp - Power Supply Cable


What is best for power supply cable, to supply small tube pre amp (50-60 mA)? Two of single solid core, non solid core, or even a coaxial cable?

Could we gain advantage from coax cable to be used as power supply cable, since the current is relatively small, e.g. any advantage in audiophile term?

What is best: twisted or non twisted for AC, DC and/or signal? I'm still confused which should be twisted and which must not.

This may be in order to reduce noise radiation from cable etc (like carbon cable with thick coat in automative spark plug cable).


Ervin L
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Old 7th July 2010, 10:02 AM   #2
SY is offline SY  United States
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It's DC.

If you're worried about radiation from the cable, you should be taking care of that at the power supply end, rather than directing the noise into the preamp box. Make your raw supply clean and low impedance, then have local bypassing (or better, regulation) inside the preamp box. Then use good, low resistance wire, which does not need to be fancy, between the boxes. The wires can be run as a parallel bundle. Don't forget that you have heaters! And make sure that there's a good, solid safety ground connection between the raw supply and the preamp box.
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