[Jukebox-list] "Clips"-was-Cartridge Installation on Rockola1438 ?

[Jay Hennigan]

Don Tutt wrote:
> Hello Britt
> 
> Try your idea of wrapping the ground wire around the signal wire.
> Several difficulties might result.
> If the combination of wires is too heavy you might have tracking 
> problems. If too stiff you might have trip switch problems.
> Because wrapping a ground wire around the signal wire does not fully 
> protect the signal wire from electromagnetic fields, I would suspect you 
> will notice an increased hum .
> 
> Trouble in any of these areas might mean you should replace the wiring 
> with new sheilded wire that is light enough and provides easier ability 
> to solder to the sheath.
> 
> Do you understand how to properly prepare the end of a sheilded cable 
> for soldering to signal wire and to sheild...?

Carefully strip back about an inch of the outer jacket without nicking 
the shield.  You can delicately cut a ring around the jacket with an 
X-acto knife or slit it lengthwise if needed.

The shield will be one of two types.  It may be braided forming a 
diamond pattern or just fine wires in a spiral.

If the diamond pattern, bend the wire in a U right past where you 
removed the shield.  Pick an opening in the braided shield with a 
toothpick and poke the insulated center wire through it.

If a spiral, just move the insulated center wire to one side and twist 
the shield wires together.

In either case, at this point you should have a Y, with the legs of the 
Y being the shield and the insulated center conductor.

Wrap a rubber band around the handles of a small pair of long-nose 
pliers to hold the jaws closed when you let go.  Clamp this on the 
shield right near the point where it enters the jacket.  This is to act 
as a heat-sink so the heat of soldering doesn't melt things.  It also 
helps to hold things in place.

Solder one clip to the shield on the free end of the pliers.

Strip the center conductor and solder another clip to it.

A small length of heat-shrink tubing can help stabilize the joints.

For stereo, make a short jumper with two clips and a 1/2 inch piece of 
wire.

Plug the shield onto the LG pin.  Jumper the L and RG pins with the 
jumper-clip wire.  Plug the center conductor pin onto the R pin.



--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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