CONNECTING AUDIO TRANSFORMER

Radio Record, Volume II, Issue 1, 20 July 1928, Page 13

CONNECTING AUDIO TRANSFORMER

fNouIry is frequently made as to the way in which a transformer should be connected up when marked IP, I8, ete. Failing any definite directions, it should he connected as follows :--O.P. to plate of previous valve, IP to B positive, O.S. to grid of next yalve, and LS, to negative of gridbias battery, or if no grid-hias, to the filament battery or terminal marked © positive, This arrangement is usually correct, but reversals of beth primary ‘and ‘secondary should be made in turn ‘if there is any suspicion that everything is not OI. The yalue of the fixed condenser shunted across the primary of the first andio transformer is not often stated by the manufacturers, but is often of importance in a circuit. Its yalue may be from .0005 to .001 mid,