Jottings

Radio Record, Volume V, Issue 31, 12 February 1932, Page 23

Jottings

HEN adjusting the capacity of a compression type condenser in 4 wave-trap, use a long-handled screw: driver or chisel-edged skewer, so thal the hand is well removed from the coil. ONE disadvantage of a large coupling condenser is that it is rather liable to cause grid choking. [* R.C. coupling the value of the anode resistance is not the only important one, for the size of the coup ling condenser and the resistance of the grid leak both have an important bearing upon the quality. A USEFUL safeguard against threy hold how] in a short-wave set is thy: provision of a .5-megohm = resistanc.: across the secondary or the audio transformer. ONE of the great advantages of R.C. coupling is its compactness. Resistances can be placed side by side without féar of interaction such as would arise with transformers.