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In Reply to: Re: That won't work posted by JANDG on April 27, 2007 at 20:55:29:
Inside the chassis, the shield only needs to be grounded at one end (or in the middle somewhere). This is low frequency energy; wavelengths are very long and a few inches of conductor looks like an infinitely small point.Perhaps the main difficulty using shields inside the chassis is the need to be sure they don't touch anything. They need to be routed and secured to prevent shorts. Equipment manufacturers in the '50s and '60s somethimes use a single, hollow shield tube to route filament wires from the rear (where the power transformer is typically located) to the front of the chassis. This helped minimize hum pickup by the low-level stages. The shield tube was usually secured by longish solder lugs riveted to the chassis. The lugs would be wrapped around the tube and soldered.
I use shielded cable myself sometimes, but it's a nuisance. For filaments, I nearly always use twisted pair as Ron suggested.
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- Re: That won't work - Triode_Kingdom 06:49:05 04/28/07 (0)
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