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Show AMPLIFIERS Amplifiers, which are devices defied de-fied to Increase the volume of sound, ,re very simple affairs and while they "'ay be bought ready-made any per-Sl'" per-Sl'" can construct one in a few hours at much less cost. The most expensive tv of an amplifier Is the bulb or mini-tube and as such tubes as i'vrs are much cheaper than others " "re exactly as good for ami.-liricn-w-though less elliclent in the send-S send-S set money can be saved by using '" A one-step amplifier, on such set as described previously, will ! y Increase the clearness and """ess of messages and by adding 0 or more, and using a loud tone c'i'n r pllone' music, singing, etc., or n Prot,uoed t0 mi a hu'Se ri""" 'all. In using two or more steps ' amplifiers it s merelv necessary In Fi'i "Ue tlle fil"st' wllk'n ls s''own 'n n f T,le "ly tlllnS t0 lle borne fur, 's nlwa's to turn the trnns-f(,r"''s trnns-f(,r"''s ut r'Sht angles to each other dee'Kh SUP" Tllis is essenti;l1 in stul r l brCllk up the nl"f-'"ctie ni-'ul-s In- )reve,lt the machine from squeal-n squeal-n J roarhig. Another point to bear leidc !i ls Uu,t the shorter the grid he more efficient the whole. 5rck e 'Sure, A Is a jack or plug-tl,e plug-tl,e wlll-'1' Is connected as shovvn. ''"Ck t'ter &rnis a n lelng connected (lew0 f'le Phone connections on the l,v (n"r or "''iginal receiver set. Then. Wtwelf" the P'lig of the phone Q u,ese (a a) the contact with li B Is broken and you can nsten-in as usual, while, by removing the plug and placing it at C, the message is amplified before you receive It. Hp. 5S Then if a second step is used connect c c to the jack corresponding to A on the second amplifier, as at b b, and so on. The transformer D should be purchased ready-made and connected as shown and according to the directions accompanying it. In the figure. D P represents the primary terminals and D S the secondary terminals of the transformer and which will be found marked V and S on the transformer binding-posts E, m the Illustration, is the grid; F the ampli.y-Ing ampli.y-Ing tube plate; G the B batteries o 4", volts; H the storage battery, and I the rheostat. Fig. SI. The same six-volt storage battery used on the detector set supplies the current for the amplifier nnd the connections to which are shown at H. Although V, 1- eak is not essential to this nn.pll-Her nn.pll-Her one may be used if desired and should be shunted In as shown at K. ( O e le which you should always f re- tember in setting up nn nmpl 1 r o , .her radio apparatus is to keep all wires as short and direct as p.s,b!e r otherwise the set will howl an j 77 Another thing is to keep all 1 free and clear and where the, cross keep them well apart Al , never run two wires paral el I ' w ; e avoided and if it cannot be a ' ,.m, them parallel for as ihon a di tance as possi'ile. |