Show large wire necessary for A C filan f in the construction of seta th 1 10 be operated from battea question of the size of thet wire rarely enters this 3 1 to the comparatively low corn quiren for each tube and that a slight difference in the i applied to each tube males to no difference in the operation receiver I 1 in the case of receivers i A C tubes the situation Is qu ferent the current required bi tube Is very much higher T type for example draws lo 10 peres if an attempt Is made crate several filaments in n with a single twisted cond neto nang successively to the nv i several difficulties will arise dueso the higher current tl a correspondingly higher voltti along the filament this mean quite a potential difference ia ast 1st between the first and the las if the wire is small enough t deuced filament current may be ahe really serious in however Is that this drop in tin ment circuit Is impressed aa i e m f on the tubes in the usual circuit ai ment llis ll Is trouble Is quite the radio frequency amplifiers 1 set may be perfectly quiet incoming signal A carrier wll be received and the hum dimmei ly becomes noticeable this la t the A C e m t modulating tin rier this Is then rectified t detector and becomes audible to overcome this two things ji be done first large wire shoe used to make the drop very i A then to prevent the difference in to different tubes occurring leal approximately the same lengths A be run from a common point it say three stages of E j frequency amplification are asci the feeder should go to the se i stage from a common point pai i bax inches from the socket two i of twisted conductor should ben the first and third stage tube i where tie leads ahei i proximately the same length iso 18 wire will be found satis f tory in other cas about should be used volume control means for radio s experimenters who have attric to adapt some of the volume ce used in D 1 receivers t i C sets have found that it was p ble to get a good w volume point this trouble oc when the volume control Is circuit of a radio frequency tube of the detector this control 0 consists of a variable resistance s ed across one of the tuned carral the reason for inability to ari the signal to zero Is that the pi line is acting as a line of the can current type acting as the lanei in wired wireless and high frequency signal into the through the plate supply unit may be sufficient signal impress the detector to give good even when the volume control 1 for no signal to overcome this it Is necess offer a very high impedance to radio frequency currents to ck them out A radio frequency ci should be inserted in the radio quency plate supply lead at tin celver A 01 or 02 mica condes should then be connected from th celver side of the choke to the return lead potentiometer I 1 speaker should not be placed above radio 5 the quality of programs now L able deserves the best possible clency in reproduction it is known fact that the tone talked Is dependent not only 0 efficiency of the speaker but 0 position in the room another well known fact Is ta Is undesirable to place the spead erectly above the radio set thiis easily tested by moving the sp about over the top f the set it will be noticed that distortion curs as the speaker colls come the radio frequency field of alie frequency tuning units ahe shortness of the auit sp cord often Interfere es with plad reproducer to best advantage 1 this Is now easily over con means of efficient extension caw dally for this purpose on sale tt radio stores household pussy cat 1 now blamed far st A new which may B the fur fly in debates among rad Is one advanced by a ton fan that the W cat may be an overlooked sw of discord in radio as well as alley v As I 1 remember it n aarnham the capital fan i la 11 much electricity on alie arched back of ahls B of the feline family why y the source of static in the low er as well as when she para stuff on the backyard fence |