7408 EDI | Alldatasheet
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@B ELECTRONICS —7408 reset BEAM PENTODE FOR AF POWER-AMPLIFIER APPLICATIONS The 7408 is a beam-power pentode primarily designed for use in audio- frequency power-amplifier applications. The tube is a direct replacement for BASING DIAGRAM the 6V6-GT, but features additional controlled zero-bias characteristics. @ © GENERAL A ELECTRICAL @ Cathode—Coated Unipotential Direct Interelectrode Capacitances} Neuts MECHANICAL BIA7AC Mounting Position—Any Envelope—T-9, Glass Base—B7-7, Intermediate-Shell Octal 7-Pin or B7-59, Short Intermediate-Shell Octal 7-Pin with carriers TERMINAL CONNECTIONS MAXIMUM RATINGS Pin I—No Connection DESIGN-MAXIMUM VALUES Pin 2—Heater Heater-Cathode Voltage in Nerd Number Heater Positive with Respect to Cathode Pin 7—Heater Heater Negative with Respect to Cathode Grid-Number 1 Circuit Resistance PHYSICAL DIMENSIONS Design-Maximum ratings are limiting values of operating and environmental conditions appli- . cable to a bogey electron tube of a specified type as defined by its published data and should "ie not be exceeded under the worst probable conditions. Max, The tube manufacturer chooses these values to provide acceptable serviceability of the tube, T_¥ making allowance for the effects of changes in operating conditions due to variations in the | iF characteristics of the tube under consideration. . 19 2 The equipment manufacturer should design so that initially and throughout life no design- ag MAX. maximum valve for the intended service is exceeded with a bogey tube under the worst probable| wax | operating conditions with respect to supply-voltage variation, equipment component variation, equipment control adjustment, load variation, signal variation, environmental conditions, and | t variations in the characteristics of all other electron devices in the equipment. mo The tubes and arrangements disclosed herein may be covered by patents of Generel Electric Company or others. Neither 1 with TEAL BAARERS the disclowre of any formation herein nor the sole of tubes by General Eleciic Company conveys any license under wi Potent cloims covering combinctions of tubes with other devices or elements. In the absence of an onprats writen egress ment to the contrary, General Electric Company assumes no liability for patent infringement erising Out of ony use of the EIA 9-41 fubes with other devices or elements by any porchoser of tubes or others GENERAL @@ ELECTRIC
CHARACTERISTICS AND TYPICAL OPERATION CLASS A, AMPLIFIER Plate Voltage oo... oe. cc cc vv vcdeeeeeee ee eeceeeeeceeeeeeeeeeeeseeeee esses 60 250 Volts Screen Voltage... 62.06 eee 250 250 Volts Plate Resistance, approximate... 6. eee eee 50,000 Ohms Transconductance. 2.2.0 nee ee etn OS 4100 Micromhos Load Resistance... 6. eee 5000 Ohms Total Harmonic Distortion, approximate... ee 7 Percent * The equipment designer should design the equipment so that heater voltage is centered at the specified bogey value, with heater supply variations restricted to maintain heater voltage within the specified tolerance. { Heater current of a bogey tube at Ef =6.3 volts. Without external shield. AVERAGE PLATE CHARACTERISTICS 140 ry co 70 Hayes deeeeedaaeete Cees tas fecee eet feaeeee Gee eee Age ag taroeee ett Foi $a EoSOUUESEES ozs ouS52"57"=cnacezez luted cated eteT ented sated statastes dees ites tsesztsessszts ME E oo EE EEE areata eaceae EEE eee Eau EEE HE et aeeT aa ae Faia st t8asereccntsfad eg fesebazer Teed aQaQe{orsvesseeeseestersscosca seus anes stay ctatstesassctatettl MAME = 7 Leet ss SREERESS: ceegeuenee ea iar
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" CS ee says” 5 ‘ Lh I scaEE SESS Suen He 3 EAM a iestseisotveeestcz cee eet EAL oe Se fete Hat i HH = t & ee Un Fee tee eee ee ag so ho Se cea ge TEESE: Ea BAIS e ci ee UES ene esi ae } rE eae aageaeewetaerae aa eee eared 200 ieee cegesceerasnees eset fsesseresseeersl . = ae Hoss reed iners K=556 11-101 10-2 av LATE VOLTAGE 18 voUTS “00 500 ue Se aaa PLATE CHARACTERISTICS APait 18, 1960 SSd54EESEESRESS Eegesabsi0lan0/ H4E8000080 0008) GtsbabSCCTl SHH ey = areo vacue FE eigen geata gs Oat] eee EE pares ea eeeecerteeea| ast eeessceeet eran creas ttFes, = 250 VOLTS TTT HH E Soo eS Eo cst’ cotcernessezset ned sescaseseesces! PH ed SHES SESE tasaz asada eazezeses = Ht a ee et eure fetoert sated cuafssetertestt fpiatesti = igi falcata estes armed events a ect Ef 200 SH eeareaseesp| = 60 fo 5 Se = Bae aera eee gate ee ve NH GSetasuidagdeessasviaeeonstiiseteeeseseerssees ses oasadeteategenasat tecataeessteltrauiietey ee ae pee seanaanseececdsese ever! isa Pee eee ae ees cena a BBERE GEARED! Sooceeeeee fy aun ueeeuuuuessenuesueeeeeers bas netanr enters ae a ree ee eae : areeeg rae ag ae eg ce etch cee 2 ee eres ° cea ae eg raeeg g a seeseetd ESSRICESose AH K-55611-TOL10- iat 300 4 sabesseieazzere
3 LATE VOLTAGE IN VOLTS 90 500
APRIL 15, 1960
408 ARACTERISTICS
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AVERAGE TRANSFER CHARACTERISTICS 7 Page 5 Tory TA PRS ESET Ee err ea rae et ee eee Sd5dGzani GStEaSsSGtE jest utzes totes EAI ESN tapad irazazeaig teat stare insta teess svat fost Eset ede eS SEU PSSST elu ES beet eee SERA AERAAESEA ETH! HITT Ed FEE HTH ati iiaaaa PEC pepe HHEHT c= raveo vanve Pfs aes bff cceeceseal Rem oesfeesssial EEHECEY ef = 250 veers IE i J TETE! mina Sceevasessuees Feerl aba] HET) Eds> 181 bees Bata : Levert 10 & ee sree ate came aie Ea eae : EHH Hina THESE SHEE Eee] 3 BH Hal aera ed Bday = HUES EIS | AS AGetiane] 2 esta Fi tan teat eas: fea besa eeees cesteseed sets cocts ect ese] 00) 00 mie Fasessise:OH0Sueda¢aceass seed ieee ttt inen Ht HHH FatEanatat nuns EARAHAaGaLTEETGTETI SSSEBEER ED EESEs i as casei Pope 6 = A : pdsesdezs fs ed cba ote tes Ftedd ones ofess esos zed fetal aaa rsnanst@y fess ecesteae’ avtsveiniticel ET Et FE Eo eoto eee Oto eee econ NOM BERG epee ceeetocteeese-cteeeecoeescsts! Seaeesessrtcoscecsescesensceamaeual lads a easel nares ay ae 1 PAH HEH Sb & S Healt Ha resaasree Ee ae aa ie er i a en ee acd ES En eae ceca ee a aed eal emcee gas oecaatocetcudentesat as es aestontersaeqy edad sti Suese*2 04 nsizsatee=reciemeat pao>cattatieet Eng se este ef ere ar PO te eran EI ce ee Oo ee -40 —_ 30 20 =10 0 K-55611-TD1 10-6 GRID-NUMBER 1 VOLTAGE IN VOLTS APRIL 15, 1960 OPERATION CHARACTERISTICS oo D8 EEE ERS HHHSH oH Hae EPTE e, = 250 vours = asec aeee ides! inal HEH esdzaeNaa4ea0/ 2ezaii aatisel Sg fae Bc SE EEE Peer SESE ee, = 250 vours Heo = 8 24 SEE Ec EST ef? = -12.8 vorrs = FS Pompeessesteazs feces eons iv tg stdecztideeat oesttiiaafeterstes ate Eig = 88 vours truss} 0° 5 ORES a ae EE ete ey) EE Sate esearch 2 ae ag ce eaemeaatieia Si ar a ear ae ee — "REE Eee | = Sosa gest cessed ctciaz? Eevee aiid cea tated casa fay afaarafaaseeceseeegeceeee e2eq eid fad aad fad a a eaadfaasracs: PPO FM Sead geez GnuTadnsessas sce suet aeapny cea-pcenaetsefacesaened]eveeezece’ eeoleadasnasste w a cee ace feet eeu ee perl ed eee i asi) ff cesataa sec aaidi fest ceeetcessd #feseated les dazzed tees fetes tonestsst comes eetgsazezttacs RG RSsadabaeesssat tat csedatatanseneedatedstesas svatateest Gueseitetainded ctazstosed cessienas ccctsroced| to Sami 22sec dst ocsasascocat tac sagidssnsstted oteateteCagea aseeeosvese?tzccaq eestseeed tezstitt sae Sssdts eatnstsstessedentere7yaq)Mc(T2csineetetestresy cocgazeazzsnsestesstectes ometst tes asesststs ME seta ueussssaduasazsrseuneussaadaiassd savas asses eset avetesiteea cesta tees evatad roves stan-ercestzst= aE ° 0 2000 4000 6000 8000 10000 LOAD RESISTANCE IN OHMS APRIL 15, 1960