| OCR Text |
Show Where Trouble Comes in ! Altering Your S. C. Set ' The trouble in altering the single circuit set lies In getting the tube to ! oscillate at the high waves, and also hi the loss of volume and distance reception when dry cell tubes are used. In trying to overcome these two things the ultra million circuit has been suggested sug-gested at different times, but this circuit cir-cuit in Its standard form also has, shortcomings, making it little better, If any, than the tuned plate circuit. The receiver described herein is an improved ultra million circuit that fills Secondary Circuit Connected in Ultra Audion Manner. tin' bill both in ease of oscillation and In distance of reception. A glance at tiie circuit will show to the fan that ll is a two-circuit tuner with the secondary sec-ondary circuit connected in the ultra mulion manner. , The primary and secondary coils of the set are the stator and rotor respectively re-spectively of an ordinary variocoupler. The secondary tuning condenser may be the one formerly used in the aerial circuit of the old single circuit tuner. The other variable condenser has a capacity of .001 mfd. This condenser is included for the purpose of eradicating eradi-cating the fault of the old standard ultra audion circuit, i. e., uncontrollable uncontrol-lable oscillations. The two fixed condensers shown in the secondary circuit must be good mica condensers that will not blow-when blow-when the B flattery is applied, otherwise other-wise the tube used in the set will be burned out. The grid condenser and leak are standard. It is suggested that the constructor experiment with tie grid leak in thUs set after he has arned 'he tuning. Trv various values and also try shifting It from its present position to one wherein it is connected from the grid to the negative neg-ative or positive filament. New York Sun. |
