What is the pipe shield?

Shield is a device used to filter out noise causing interference with radiofrequency (RFI) from vacuum pipes in electronic circuits. Most pipe shields are cylindrical covers that slip through the vacuum tube with a ground mark or base that connects to the tube socket point. The tubular shield works on the same principle as the Faraday Cage, ie absorbing and abolition of interference before the tube is picked up. Vacuum tube shields are available in a wide selection of designs; Some are relatively simple, envelopes with one suitcase and others are more complex, multilayer or covered varieties. The tubular shield also often doubles as a cooler and distracts the thermal energy developed by a tube.

Electromagnetic interference (EMI) or RFI has long been users of electronic devices, especially those who use amplification devices. EMI is the main contributor to a university floor or natural noise level in amplifiers, especially to tubular fromSubject silvers to a huge recovery of popularity. Latent EMI sources are also constantly increasing, while the radio frequency spectrum becomes stronger every day. They also add to the homes such as vacuum cleaners, vacuum cleaners, blends, TVs, mobile phones and even bug zappers, to EMI soup, which causes hum, hissing and howling even the best tubular amplifiers. However, there is one simple device that can maintain the noise floor of the tube amplifier as low as possible - a modest shield of the pipe.

Shield tubes work on the same principle as Faraday Cage and usually consists of a conductive envelope that covers the vacuum tube. Faraday Cage is basically a hollow conductor whose walls are used to absorb and cancel the wandering external signals. The Shield tube works in the same way by stopping Emi-induced signals to sometimes enter the inner circuits of the vacuum tube. MostFrom these shields, they are designed from simple metal sleeves that slide over the vacuum tube, although more complex examples with conductive covers and complex profiles are also common.

once in place, the sleeve absorbs most of the EMI signals inducing hum, thereby reducing the noise from the amplifier. The tubular shield has a special value on tubes that have the highest profit values ​​such as pre -combined pipes. The use of pipe shields on these tubes often serve as a cooler. The planted tubes with high gains are really hot and the pipe shield can help disperse a large part of the heat, protecting both the tube and the rest of the perimeter.