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In Reply to: RE: Virtual Umbilical... posted by caffeinator on June 11, 2017 at 06:38:14
I've been thinking about the same thing. The chassis for this will be constructed from an aluminum extrusion with a 3" X 8" cross-section. I bought a 4' length, so I can cut it to practically any size. If it's about 14" deep, that would allow positioning the PT and power supply circuitry a reasonable distance from the phono section. I'm planning to shield the phono tubes (all 9-pin), and it might also be possible to add a small mu-metal shield around the PT. I think this will work well. :)
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Hi Triode Kingdom,
I've had a project on the back burner forever with similar design parameters...a pre-amp I plan to put in a rack-mount case, which is almost 19" wide, I think. Obviously plenty of room to separate the noise-makers from the noise-takers.
Btw, I recently took a class about EMI/RF interference - it was great and went a long way to explaining a lot of typical layout and wiring practices. One fundamental tenet was to, whenever possible, shield or otherwise mitigate noise sources, as opposed to noise 'victims.' I suppose one could always do both, especially if weight and cost aren't huge factors (this was an aerospace-centric class; weight is obviously critical), but often the biggest overall dB/$ payoff will be had when attacking sources.
Distance is a key strategy, since, depending on the type of noise, typical diminution is on the order of 1/(separation distance) or even 1/(separation distance)^2...you get the idea. Shielding can also yield significant benefits, as can good wiring practices.
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