I2U7 TUNG-SOL | Alldatasheet
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fide COATED UNIPOTENTIAL CATHODE Jo B. x ae ky . is HEATER i (6) 16 2.6 VOLTS 0.15 AMP, (| rey [Max 12.6 Vou Xe Ry) + og AC OR OC ws ai] is Ns) ty {Max ANY MOUNTING POSITION & 2S 1 ne GLASS BULB BOTTOM VIEW MINIATURE BUTTON Pin ease on THE 12U7 CONTAINS TWO INDEPENDENT MEDIUM MU TRIODES WITH UNIPOTENTIAL CATHODES IN THE 9-PIN MIN(ATURE CONSTRUCTION. EACH SECTION 1S INTENDED FOR USE AS A GENERAL PURPOSE TRIODE WHERE THE HEATER AND PLATE POTEN— TIALS ARE OBTAINED DIRECTLY FROM AN AUTOMOTIVE BATTERY. DIRECT INTERELECTRODE CAPACITANCES wine wirvour TRIODE UNIT 42 smiguo ests “snieuo GRID To PLATE: (6 To P) 1 15 met INPUT: G TO (HK) 18 16 wut OUTPUT: P TO (HK) 2.0 0.40 but TRIODE UNIT 42 GRID To PLATE:(G TO P) 15 1.5 mut INPUT: G TO (HtK) 1.8 1.6 aye? OUTPUT: P TO (H+K) 2.0 0.32 pat RATINGS InveRPRETEO AcconoING TO OFSIGH CEATER svSTEW CLASS Ay AMPLIFIER HEATER VOLTAGE* (APPLIED TO PINS #4 & #5) 12.6 volts MAXIMUM HEATER-CATHODE VOLTAGE £30 VOLTS i MAXIMUM PLATE VOLTAGE 30 VOLTS: 7 MAXIMUM CATHODE CURRENT 15 MA. i MAXIMUM GRID CIRCUIT RESISTANCE j FIXED BIAS OPERATION 0.25 MEGOHM CATHODE BIAS OPERATION 1.0 ‘MEGOHM “THIS TUBE 1S INTENDED TO BE USED In AUTOMOTIVE SERVICE FROM A NOMINAL 12 VOLT BATTERY SoURCE. The: Eaten’ ts! Taenerone gestaneo 70 orenart OVEN THe. 20.0. T0 29-9. voLvact ance ‘encountessh Inerhis Seayicts we mesiauw MaTines. OF THE TUSE PROVIDE FOR AY AoLQUATE: SARE EREROR SuEe Hat "fae Tose sue "witwstane Tae WIDE VaayMTvON TW SUPPLE VocTACES™ Cour saveo o¥ FoLtomine eAce TREO TUECTATE THE ECRETRON TORE BTVTSTON BLDORTTELOS HES UERTETS eet APIO ADEE PONTE BE
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS CLASS Ay] AMPLIFIER - EACH SECTION HEATER VOLTAGE 12.6 vots HEATER CURRENT 0.15 AMP. PLATE VOLTAGE 12.6 VOLTS: GRID VOLTAGE fe) VOLTS: PLATE CURRENT 1.0 Ma. PLATE RESISTANCE (APPROX.) 12 500 ‘OHMS TRANSCONDUCTANCE. 1 600 UMHOS AMPLIFICATION FACTOR 20 GRID VOLTAGE FOR Iy= 10 WA (APPROX. =15 yours AAA EEE Cerra Pry ry yy ee Lt Li TTT ty yt yy | LT PrTT TTT LT] [Terre rye yy LTT ETT TTT). Co PT TTT TTT Tyr | CT TTT TTT LT] LT errr yy Tet PTT Tey [Ty CEPT rey yyy er 4 [ {| SERRE eee eee LT SERS eee eee Ao of Cerrar yr a ene CPT rp Py rye = TI PTT rs COP eae EE a pe s& Ll HA -H-HH {| pee ener ceeasn z[T LT tT Ty yy Ed pzai Cs Zea LT PT TT yyy ry Pzap=al a 0) LT SRR eae aera. LT] ee er ee per er eT Lt GRID VOLTS IH [TTT yet yyy ety | [TT] He Cre rrr rrr
0 ee a ee ee) Coo Co) pss = CL mcr Co HOE er ='i26 vores FEE er Cor go err COCOA Cr COCO oh eo cco COCO ECC Ze Cor HEE ee Co S000 See 4 0 ee ee eee eee i Oe ee CC COCO A Cor COCCCC OCCA As Cos ECC Cos, pte COO § CCE eer oA 08 ee Oe Ae Ae ee ee 0S ee Oe ee Ae any ae C= COCO eee COA ey SOO eA A COs CeCe Pee COO ee eee cor COCOA Ae ae sa Coy CCCCCCOA eee er ee Co phe ere et Cor COCOA ee ee CCr COO eet ea er ee Coo Hacer a Cer er er ere Coo DA er Ty Peer parte Tere terse Cor (Bet er ee ee er erred rH 0 10 20 30 40 50 60 | Coo PLATE VOLTS co a SURESTOT TORETRTE THES ELECTRON TUBE BIVTSTON BLOOHTTELD, BER SENSED epee ERT ES TSO PATE TONY