Old Time Radios! Restoration and Repair PDF
Preview Old Time Radios! Restoration and Repair
Old Time e@ RESTORATION and REPAIR Old Time Radios! Restoration and Repair Joseph f. Carr TAB Books oi Contents Acknowledgments vii Tneoduction. viii 1 A brief history of radio receivers 1 sey axperinees E Sew inventions Broadcasting = Devrloymes of radiv x Crystid seis regenerative deteeton rectsets--Taned rio fxsgacry retciver Reutrodyne eeenivere Seeand-cenceating TRE sadins-Sepedhioteriniyee wevsivs ‘Vacuums tube radius 18 Radio ensteuction styles 2! Barly wueune cubes “20 3 Vacuum tnbes-—how they work 29 Bakon affect 24 Thernionie esnission of eects 36 The vacune mar dieaie 28 rathesles—Diude enmslevction inde apo Yeiode vacaum aes 57 Tetrede vacurn tates AE Pentende vacuauan cokers 4} 6 Beant pawer cubs 4a Gdhuy aeons fo vonsider $7 Moaleparpase thes 4% Tabs tases ant onvlapes 50 Testiog vacisn cubes | 30 Nenu habe esters Acstons- Transeo Shorredtess vestor Huts zane testers Lanmuerrial sabe testers Radin receivers: The basics 56 Ruta simals 5 ‘Bu tunes Toned radineroypineey radios 62 Suporierorraiene tacos 62 Radio esinuple a Radio power-supply cireaits 69 Bereoperatd seis ie power simples 70 Coutporeete of he ae prtyer py 31 Tanstormers~-Transfertier ennstruttiot shored -Recrigere Rg Tern Saints rections 28 looting ors revtfer rates Neitge regulon 3T side prver supplies 92 “A Abaltn Fhe endo yewor supplies 08 le shat rranstormer The audio section 95 nee raprestacers 95 rpliones-—‘suispen Audis prranpliier 1 Volusneneprol eitenits 10 ‘Vane contieis 08 Audio octput stages 760 (Classes ul audio power ampdiferChassa, power araplifize— Push: ll clase B and ofsss AB andio power wnphflors-—Screun Bid Fendleark caus Replacing rome, teae of RU gain 2 i ar wis 118 speakers vith permanent Inudspeakers 127 40 ‘The radio front-end: xi ampliliers, first detectors, and if amphifices 118 Tapmd resonnan cites £8 ‘Yectots-- Indian aa intact ise fueron ine ees Caples wed expacitanee Thre of copecitanceneDieck down voltage Cire sembols fn cupaetinse ised capaions tbe expr epishle fepimionsCoptltors in eatery ant eae apa eats Ue nesta ites 240 Serie sesamin, cic ‘taoeil BPAF macstormers £47 Canetration of RPAE transrc tanfonners AE ampier cuits 148 Scpetirtrodyte rcetiers Superbetersdee hraboorifarr circy~-Pent Canbining inductors. elias avail somant eireults Buniviorh of REAP 8 commune AM detector and automatic volume-conteol circuits 248 Review of ample sorduhation —15% ‘AM deloctors—-Fleysing al TeForest detentoe-—Piate delecia— (Griteak cicetors—fegenerulive detine-Sbater dian deteclors—Sofid-srate diode Searetoss Antonaaie volume controt eles | 176 ‘Tees lens 772 Radio repair bench west equipment 174 Milinoeees 77% ‘re COM The VIVI The DAE one Sateen 177 Sigua gowns 178 ‘ido gpunaiors—Punctan generaons--RE signa syesracas uselloscapes 152 de power mippties sa hes nstranents 189 Basic sadio tzoubleshooting 185 Hao the cad okay (rode wars aurwise} 29 Possersigad tipple hao Hs noasunable am-—Tanatde hawt ead ratio 170 Finding the detective sage 152 ‘Keak sind recepbon 280 it 2 B M4 Moworbosting 49 Noise peebtuns 195 Oscillations. 193 ‘Merophonies~-Chirps a high-frequency oseibations istertion £02 Ladpeaker—Defocrive rsetgn mbes Shorted eutinyde bypass caqacitons=-tipen a ineveaser-vale resiators Skene ar bulge ‘pling capaciears—Shotied ot apen cuipattrustorraer winding nile npeltatons Cher Troubleshooting imermittent problems 206 iewing the Senate 207 Mechanically Srreceice-n— Thermal imervtten Problonis will TF ane RE scasbnens 222 Radio aligomaeat techniques 2 A roi revivers HF Compl Ue signal generate tothe Fon Sig rn dovl indiator AS! algoatent procedure P31 aad teccivers Stren tals —Abiemment sing aa namie “higuiveal avg seen getanstor set scion align 228 ‘Alignnent fools 23 Pancdosion | 23 sera Repairing water damage to radios 232 Gioaing steps 227 faing rreordies 250 Testing 228 Electrical salety ng che workhench 238 Feceicas shock 233 What to do for on eleettieal shock viewn 92 Hows mocie cerrent ws far” 2400 Tigh currant, ow vootaye sae? 2a Comenon kazartows cleetrical shock ssiationls 25 Some cares for the prublewss 2s! Some general advice oe safely 7 Conctasien, 24 Appendix; Component color code 246 index 252 Acknowledgments AIRY SSG He Te CA CONSUL, ay Fut Seas a HST PK PRES 70 Electatiey Division for use of material tron The Jee-cr American Radia Relay League 225 Moin Street, Neh irom ihe 52 eaten et swish thank Jobe con Ginny Sane, who typed snajor postion ave mauussript for me, ani-Soe Kogster of the Mi Adlon Avaiqae Beio Club, who owl me 2a photograph radios Irsew bis colicin far dhuskreuons ie this en, Introduction Fs A UPTL: nic ANC RRTISG FE4E A GUE a8 YON AME TO WAL FERC A RAMI antique mle club mvctingaed see rude receivers lint fannie on when they were ander wrersentg descabunl ag niciques ww tiagsers! Bur lassie end antiqne rade zoe vers popular tatty, ard mea sieusands of people naw collect and restore golden alsies, Althomyh Fcomaenced my ra.ko repair carver 19 1859, | worked ding fromm BU aneleL upto Ube Batest ele Hotes as oF nearly been ago}, The period thal { servieert radios span ahe waetkens tute age uth cashest YAU afte integrated elveitge, We you read absnut erumblestanding relivy of any eta Sn shis bok, yon eae getting the story Irom ne whu was veal deve Mier the nial shock of advancing sage] discovered that only a fr poopie sit nove tae old skills nome lo Keep ‘ese sets in pou sepa ancl working propedty, ronee yee ene ts nak, yo wll al be a ulated scembua of the sonal (ht pruners Wark again. I's nbW een tasistors) are Topelitiy growing! ast who con make those old roluively ensy fur ulmost anyons, sven thous totes ( ailing of Bie pee ‘The bist chapter of this hock iea brint history wf ral receiver design, staring wsithiie Brant rafievensand wppers that Narcon and ober easly pionegisused, ip bsthe ioe smperneierodyiy recetver. Fox a while during abe 1820s, number OF ehfionent slesigns were offered, Mast uf these designs are covered ia chugging 2. Wie ‘ill abe take 4 adek loo a radio yevetvers over the decartrs in chapter Z, vt gengginta ne mich dees Jecheter 4 discuss dhe tasiethoory of vari bes Tris hure test we will evaver an asulent taehuns uudeestnd classic ard antique sation. Chapters & Ugongh § go into cota on varumn tabs creaits fad an radi is wl eae shou! PF exif we: a ante a ena a ts bs bac 8 varleats detoeuar accalls Varies the aunamudie gan wntso} AGC) a utlio arapiiers and preampliiers are covered i Chaguer ®, Ts digemsston wil raige trons zhe early beadphoue vaplliry 4p tale desis iat approached high nee. nidspenkersaareabia cox ned ashe andi ehapler Ja capler 1 ant find an extensive diseassivn af power supply cieuite need in vadies. Bi Phy su: sou, ar interest er nuked, AIM an vlassic roel ate se ech ana very engagtiog hobby. and chose whe can cepa orretitd ost sets ure espcetlly valued #y de somminigy of antiue reco fans. i A Brief History of Radio Receivers RSbID AND TELENIVON AISGNCANNG AE SO WIRESERPAR TUDSY AND HAVE HRC ‘9 fauniiae, chad we alien (ake them Tor gested. Live satelite coiraue on alt comers of ih earth is rontine. Bat ac bee time ralig~arien levi calion—vas gations agrlecitiys. Pew thiews eam ght Uke pbc imeagieiee: lb val 35208 Je radio hronleasting, Kinw a few witsmisiase—~cflan 38 ne soe 3 cranks Ty anc melgbburs—ratio grove can Emon iasiry an only a fest reBng decades, Early ratio was calla ree es “ann ails in sone parts fhe world Beexause it allowed lovedistance vomsmunientions ke the felegrap, bu wishout Ihe sane. able wirws stem froin pula to ict, Wieless teleyraphy aivo athowed service to paints neg normally upon to Jac vleuraphy, such as rerseke mount eeoas and Ships ate, ka Jer Cues probably mariners who Gra hese rea aloes i er Dractiea use of winless selegraply yeu, Howeter, advagees were nade, shed. shoe, s wench coummy the techanlogs vine reaty fr a petiod of fi Steet progress. Ockily eramgh- mich of dhe easly adic . barn.” ant need sane rac companies tmemifectored easipancal im such infra ‘Quarters up aot oe: Es Nineteenth-Century Experiments ‘ne ofthe sce, possibly the ve fist male of gles commanition Docuredn the Unite Stalestn S07 Cag mse West Cigna 8 Wasiuyan Odeo sap Mahlon oui tew site Ue varied arse spate af eoppee 1 2 Msi Histone af Butin Rooters 220" A wite sannnered the kite <0 groundealsllsaromeler below. On azorker tan 13 eles aa asinine songs eas erected, When ae af thew “rans ows exe wih elevtekity, tbe «bse gulvaxometer evieesee, Kelvaling & svnuver! sina Unfacunatey forthe foto oF cts Locia’s work revived ony wate cot for bis esnocery wnel much lve atts The skepties Weae ceaninesd=-wien Ho one eink iy onger Jeny she lence Dat ireloss tolegraphy 6 possi ilies aine-eente-cenimy expertments were cerrind ott hy sedentie gents seh as Mickel Parulag, Sichola Tesla, nad Heatich Herta, Here manote generate signals as hide ax 350 Mélz ond transmil vom aeress sho este proving positively that witeless wlogranly sas possible. Hat Herts 4 healing esperimeris were nuvee scent investiga! iwas Jefe to others to cvalive tne art af witeless communications, fo dia Ite 180%, an apergeriy talian inventor ranted Guglete Maveont strand investigations an! experimen tha niet in his achieving es Tame in the radio world, fle frst esperimented with wazcless ever shore dy out ib yards ot tess. -actos the garten af his Father's bene it ta, gourd hy the [allan governient, Marcott woo himself cad is appara er Rogfand, were in 1805 he reached ass a distance of sere 2 res Ove Ue uty Plaip wah his veeless relegraph. Starcond rapidly inereased ts dstance tur? miles, and hy she und of 4407 achieced distances of 19 mes bu soa, Ja ISB), Marconi secupted 8 suggestion of Sir liver Lodge and insert & transformer device cand a Bruntiy cules betwoon the antenna aavt the deter “Thus pews arrangement ienpriave Hin saciery af die ever and nade i gmraiele for Myzeont ta ransmit aazaas the Engh Chanel —a distance af 32 gules, Finny Marconi was tally tor the Big ts Laas Extaeted oles ia the jee maya lion aransatlantic tetegrapiy: nd than prastical bento 20 Transatlantic Wireless ee cous! of Nowtznusitind in December ts wundstept ane cole ~o phat pace Lor all but natives te avd. ful it wasus Newfoundland chai Gegliclno Sarcontwtay ia fhe late tall of EN, steiteeat St Jotiye op Feemimbor in conducts workbchenaing, msquthnent-ctramatlandic Seueless” fratioy lelageaphy. Prior Ws that tine. ve Jess iad hewn Hee roore thee expertmenal eimeatins ory aver eelatively short fistances. Marvoni Nad ecened she Amzcieau heuugination x Sese gees waive bee FAS. when hag wretoss telexapiy apparas ne ose e cepert he rests le biteeralionsl Yacht Races olf Bw cous! of New Jersey. Bor the fst rine. these ashore couldlave "real tine” reparuotassce 2 prupress ff shure ate] ncaa, The sacoass of this even ke te Gemonstations tell Staes Navy etuturand November i928, Mare us ork enannaredeceuiser, we bates 2 patorpatn ‘ot aa sar run a Higa Tight, aves, Sew tens. The fest
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