The Screen-Grid Browning Drake

Radio Record, Volume II, Issue 34, 8 March 1929, Page 30

The Screen-Grid Browning Drake

RE letter in "Radio Record" about sereen-grid valve and primary coil in Browning Drake 4, I have had success as follows and hope it might help someone else, writes a correspondent. . I screened R.F. stage and took out neutralizing condenser. I have 3in. sec. ondary of 60 turns and I made a 45-t...n even-wound primary about 2 7-8in., so that it just slipped inside secondary. This made the set howl too much, so I made a 23in. primary same as above and from that time I have had good results. A primary coil with more

turns (say 60) might be better, but I have not tried it. My aerial is set more for the Australians. than the Americans, but I have three of them using: 90 volts B battery. I am not a D.X. chaser, I just logged these from curiosity. WENR, Chicago, has been heard between 40 and 50 yards away from the door. I have wired another set like this besides my own and the owner has gone "D.X, mad" since, so I cannot complain. [In view of the interest created in the screen-grid Browning Drake, it will be fully described in the next edition of the "Listener’s Guide," now in preparation. While this is in preparation we would like to hear the views of any correspondents who have, made up the screen-grid model.~ ff Technical Ed.]