USEFUL HINTS

Radio Record, Volume I, Issue 42, 4 May 1928, Page 3

USEFUL HINTS

1. For radio work use solder that is cored with resin. The resin forms an excellent flux for both copper and tin, and dries hard, leaving a dry joint which will not collect dust. See that the irou is sufficiently hot to melt the solder tu an extent that it will amalgamate with the surfaces of the wires to be soldered. 2. A fixed condenser across the headphone terminals may often improve the quality of signals, " " §. A fixed condeuser used in series with the aerial will, in most cases, improve selectivity. 4. Control of regeneration in a valve detector circuit can be made much smoother by use of a lower plate voltage and a higher number of reaction coil turns, 5. When B batteries begin to drop in voltage and crackling noises are eyident, the cells may be used for lounger periods by paralleling a large capacity fixed condenser of about 4 mfds, capacity with them. 6. Remember to use an insulating varnish on the wooden baseboard or on the cabinet, as many varnishes contain substances which wil cause lealaves. Shellac varnish can be used to best advantage,