7412533753

TUBĘ PROBLEM:    ■

Anamplifier    *

manufaciurcr was plagucd by noisc, microphonicsnnd hum that develoi>ed in the high gain stages of his amplifiers. Sonotone

Tracking Error in Stereo

(Cotitinue<l front )xi<je 72)

al 3.07 inchcs (thc geomciric niean). For cqual errors at 3.78 and 5.75 inchcs. thc arm should be tangcnł at 4.60 inches (again. thc geometrie mcan). Tliis analysis estahlishes thc two tan-gency points for an offset arm to be at 3.07 and 4.66 inches. As before, an undershoot dis tance u can ł)e found which will satisfy all of these condi-tions. The result is tha* a should equal V'L^ł - 14.3 - L.

Thcre are two important things to noto about this result. First, a will always be uega/ire for an offset arm sińce the square-root term will always be smaller than —L. A negati\e value of a means that an offset arm always requires an orers/ioot rat ber than an undershoot. This is in contrast to the

RCA Sound Tape

z/