Smoothing Out Hum

Radio Record, Volume V, Issue 26, 8 January 1932, Page 15

Smoothing Out Hum

THER are two vital factors where the smoothing of audio fre quency variations is concerned, namely, capacity and inductance. It often happens, due to one of several possible reasons, that hum is experienced when working a-set from an eliminator, and consequently extra smoothing is desirable. Unless the hum is very bad this smoothing can conveniently take the form of extra capacity. No alterations need be made to the eliminator.. All you need to do is to connect externally 2 mfds. fixed condensers across the *B-+-" output terminals and the "B-" output terminal. Another place where extra capacity gometimes helps is across the by-pass condensers of decoupling resistances,