Tips and Jottings
Setting Out Panels. . HEN marking panels, prior to drilling, paste a sheet of paper over the face, and mark lightly with a pencil. After drilling, this paper can be
washed off, leaving no.marks or seratches. A pencil. line on ebonite forms a conductor, and if run between terminals or screws, may cause @ loss of sensitivity. Calculating Bias. WHEN no particulars are available, a rough guide as to the correct grid bias to be used can be easily calculated if the amplification factor of the valve is known. Multiply the amplification factor of the valve by two, and divide into the B voltage available for that valve. Allow for Voltage Drop. IT the case of a valve, in the anode of which is a resistance, such as the arrangement in a resistance-coupled amplifier, the voltage applied to the plate is considerably less than that of the B battery, due to the voltage drop across the resistance. This is of more importance when using a valve of low impedance, as the drop will be greater. Allowance must be made for this drop when applying grid bias,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290111.2.76
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Radio Record, Volume II, Issue 26, 11 January 1929, Page 27
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187Tips and Jottings Radio Record, Volume II, Issue 26, 11 January 1929, Page 27
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