Parallel Feed Browning Drake

Radio Record, Volume II, Issue 53, 19 July 1929, Page 30

Parallel Feed Browning Drake

"An Excellent Receiver" [ #4va constructed the 2RF Parallel Feed shielded Browning-Drake, and wish to say that it is an excellent receiver, thanks to the staff of the Radio ‘Listeners’ Guide for supplying such a fine circuit. I did not adhere strictly to the specifications as laid out in the Guide, but any alterations I made were

only on account of having certain parts on hand, which I used instead of having to purchase more. I used the original size copper shield boxes which were 1lin x Tin. x 6in., and also the 3in. diameter coifs and a .0005 and two -00025 tuning condensers. I also used Imfd. condensers in place of the two 5 condensers in the plate leads of RF stages. The only other alteration I made was by earthing the 15th turn of secondary coils and neutralising off of the bottom of same which I found simplified neutralising considerably. I am using two 201A valves in RF stages,

an A615 detector, » PM6 first audio, ana two PM256’s in push-pull in last. and also an output transformer. I have given the'set a good test for a@ month now, ‘and the results are excel. lent .in-every way. It is.very selec. tive and exceedingly sensitive; I can tune in the main Sydney’ stations. aul day with enough volume to. be heard all over the house; in fact, last Saturday I and several friends were listening to the All Black match in Sydney on the inside antenna at 5 o’clock (this was direct, and not the .rebroadcast). The tone is one of the main features of this receiver, especially with a moving coil .or large "exponential horn speaker, '.

> La There is only one trouble I encounter, and that is the volume, which is :tremendous even: in the daytime, but I will endeavour to seek a remedy for that by writing to the Question and Answer corner. I can.strongly advise anyone considering building a yalve set to tackle the shielded 2RF Parallel Feed BD. and get some thrills. I alsovwish to congratulgte the staff of the "Radio Record" for publishing such a fine book as the New Zealand Radio Listeners’ Guide,’ which, in my opinion, is worth séveral times as much as the small sum charged for it-Parallel (Nelson).