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For sale is a very rare vintage Altec 443 SāFGUARD. This unit is a feedback eliminator according to an old 1968 Altec catalog:
"A frequency shifting device designed to reduce acoustical feedback in sound reinforcement, increasing the overall gain of the sound system. Reduces or eliminates unwanted oscillation. Makes many marginal sound systems more acceptable. Adjustable impedances and input levels. Weights 7-1/2 pounds, green. 3-1/2" H x 19" W x 8-1/4" D.
