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Old 13th August 2007, 02:21 PM   #1
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Join Date: Jun 2007
Location: Australia
Default Shielded input cable

Hi all,

I have designed my amp so that the input jack is at the back of the chassis but I need to run the input to the front of the amp (internally). Should I use shielded cable or does it not matter?

As an aside, for anyone who has been following my very slow progress, my chassis arrived from the metal shop a couple of days ago. I must admit the fabricators (although terminally slow) have done a very good job and copied my plans exactly. It is extremely robust. I now know that 3mm aluminum is actually quite solid, it is perhaps a little over engineered! I will post a couple of photo's in the next day or two.


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Old 13th August 2007, 05:46 PM   #2
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Join Date: Aug 2006
Location: Taxland, New Jersey
Hi Rob,
I would tend to use good quality shielded cable just because it is correct and proper design. Sometimes I make my own with a length of teflon/silver wire inside a piece of braid.

You could also try twisting two pieces of hook-up wire together, using one as a ground, and run it along close to the chassis keeping it away from AC power/filament lines. In either case, if you must cross an AC line, keep the wire intersection at 90 to minimize hum pick up.

Both of these procedures will add a tiny bit of capacitance to the input, but should not cause noticable rolloff if kept as short as possible.

Looking forward to any pictures.

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Old 14th August 2007, 10:37 AM   #3
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Tanks Victor,
Shielded it is.
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