Valve & Amplifier Design, EL34 (6CA7) Data, Mullard Valves

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Valve & Amplifier Design @ ValveData on SlideShare, EL34 (6CA7) Data Sheets from Mullard Valves.

Valve & Amplifier Design @ ValveData on SlideShare, EL34 (6CA7) Data Sheets from Mullard Valves.

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  • 1. OUTPUT PENTODEOutput pentode rated for 25W anode dissipation,ntended for use in a.c. mains operated equipment. PRELIMINARY DATAHEATER Vh 6.3 v Ih 1.5 ACAPACITANCES Cout 7.2 pF Cln 15.5 pF C&-gl <1.1 pF Cgl-h <1.0 pF Ck-h 11 pFCHARACTERISTICS Va 250 v v go 250 v Vgs 0 v la 100 mA Igo 14.9 mA Vgl -13.5 V gm 11 mA/V ra 15 kil (.I.gl-gO 11OPERATING CONDITIONS AS SINGLE VALVE CLASS "A"AMPLIFIER Pentode connection Va 250 V Vg2 250 V Vga 0 V Vg1 -13.5 V Rk 120 (1 la 100 mA Ig2 14.9 mA R. 2.0 k(1 V1n (r.m.B.) (Pout=50mW) 0.5 V *Pout 11 W V1n (r.m.B.) 8.7 V *Dtot 10 % *Pout and Dtot are measured at fixed bias and therefore represent the power output available during the reproduction of speech and music. When a sustained sine wave is applied to the control grid the bias across the cathode resistor will readjust itself as a result of the increased anode and screen-grid currents. This will result in approximately 10% reduction in power output.ISSUE 2 EL34 256-1
  • 2. OUTPUT PENTODE Output pentode roted for 2SW onode dissipotion, intended for use in a.c. mains operated equiPment.OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL Distributed load conditions with screen-grid tapping at 43% of primary turns V"J-VRk 430 430 v Rg2 (per valve) 1 1 kO Vg2+VRk 425 425 V 18(0) 2 x 62.5 2 x 62.5 mA 18 (max. sig.) 2x65 2x70 mA Ig2(0) 2x5.0 2x5.0 mA Ig2 (max. sig.) 2x5.1 2x7.5 mA Rk (per valve) 470 470 O V1n(gl-gl) r.m... 32 52 V R8-8 6.6 6.6 kO Pout 20 37 W Dtot 0.8 1.3 %OPERATING CONDITIONS FOR TWO VALVES IN PUSH.PULL Fixed bias Vb 425 375 y "Rg2 1000 470 O Vg2 0 0 y 18(0) 2x30 2x35 mA la (max. sig.) 2x120 2x120 mA Ig2 (0) 2x4.4 2x4.7 mA Ig2 (max. sig.) 2x25 2x25 mA Vg1 -38 -32 y R8-a 3.4 2.8 kO V1n (gi-g 11 r.m.8. 54 45 y Pout 55 44 W Dtot 5.0 5.0 % *Screen-grid resistor common to both valves, These operating conditions apply with a stabilised line voltage and allow for a 25V drop in the primary winding of the output trans- former at maximum signal. If there is an additional drop of 25V in the h.t. line voltage at maximum signal Pout=45W and 36W. The optimum anode-to-anode load under these conditions are 4.0kD. and 3.8kD. respectively.ISSUE 2 EL34 256-2
  • 3. OUTPUT PENTODEOutput pentode rated forc25W anode dissipation,intended for use in a.c. mains operated equipmentOPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL With separate screen-grid supply and fixed bias Vb(a) 500 800 V Vb(g2 400 400 V *Rg2 750 750 !1 Vg:J 0 0 V Ja(O; 2x30 2x25 mA la (max. sig.) 2x125 2x91 mA Ig2(o, 2x4.0 2x3.0 mA Ig2 (max:sig.) 2x25 2x19 mA Vg1 -36 -39 V Ra_a 4.0 11 k!1 VIR (g,-g,) r.m.B. 51 47 V , PC))1~ 70 100 W I Dto1 5.0 5.0 % , *Screen-grid resistor common to both valves. These operating conditions apply with stabilised line voltages and allow for a 2SV drop in the primary winding of the output trans- former at maximum signal. If there is an additional drop of 25V in the line voltages at maximum signal Pout=58W and 90W. The optimum anode-to-anode load under these conditions are 5.0k!1 and 11 kO respectively.OPERATING CONDITIONS FOR TWO VALVES IN PUSH.PULL Cathode bias Vb 375 V *Rg. 470 O tRk 130 O Vg. O V la(ol 2x75 mA la(max.sig.) 2x95 mA Ig.(ol 2x11.5 mA In (max.c5jgr) ! 2 x 22.5 mA Ra_a 3.4 kO V1n(gl-gl) r.m.8. 42 V Pout 35 W Dtot 5.0 % *Screen-grid resistor common tO both valves. tCommon cathode bias resistor. These operating conditions allow for a 20V drop in the primary winding of the output transformer and a 5V drop in the h.t. line voltage at maximum signal.ISSUE 2 EL34 1056.3
  • 4. OUTPUT PENTODE Output pentode rated far 25W anode dissipation, intended for use in a.c. mains operated equipment.OPERATING CONDITIONS AS SINGLE VALVE CLASS "A"AMPLIFIER Triode connection (g2 connected to a, ga to k) Va+VRk 375 v V 0 v R~a 370 O la 70 mA Vgl -26 V Ra 3.0 kO V1n (r.m.s.) (Poul=50mW) 1.7 V Poul 6.0 W V1n (r.m.s.) 18.9 V Dlo1 8.0 %OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL Triode connection (g2 connected to a, g3 to k) V,,+VRk 400 430 V V83 0 0 V *Rk 220 t250 .0 I,,(o) 2x65 2x64 mA I" (max. sig.) 2x71 2x67 mA V81 -29 -32 V R"_,, 5.0 10 k.O V1n (81-81)r.m.s. 44 48 V Poul 16 14 W D1o1 3.0 <1.0 % *Common cathode bias resistor. tUn-bypassed.LIMITING VALUES Va(b) max. 2.0 kV Va max. 800 V Pa max. 25 W Pa max. (max. signal speech and music) 27.5 W V lI(b) max. 800 V VII max. 425 V pgo max. 8.0 W Ik max. 150 mA Vn max. (In=+0.3!J.A) -1.3 V Rn-k max. (cathode bias) 700 k.Q Rn-k max. (fixed bias) 500 k.Q Vh-k max. 100 V Rh-k max. 20 k.QISSUE 2 EL34 1056.4
  • 5. OUTPUT PENTODEOutput pentode roted for 2SW anode dissipation,intended for use in a.c. mains operated equipment. ~ 92 91 a HC q2 h h q3 k Oclal Bas,ISSUE2 EL3~ 1056-5 ~
  • 6. OUTPUT PENTODE Output pentode rated for 25W anode dissiPation, intended for use in a.c. mains operated equiPment.ANODE AND SCREEN-GRID CURRENT PLOTTED AGAINST CONTROL GRID VOLTAGEISSUS;2 EL34 1056-6
  • 7. OUTPUT PENTODEOutput pentode roted for 25W onode dissipation,intended for use in a.c. mains operated equiPment. ~ ~ 0- I > > ." O "i """ - " ..." :: > O II I~ ,0.:~.. 0 a.. HE ~ ~ ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITH CONTROL-GRID VOLTAGE AS PARAMETER Vg.=250VISSUE 2 @ EL34 357.7
  • 8. OUTPUT PENTODE- Output pentode rated for 25W anode dissipation, intended for use in a.c. mains operated equipment. ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITH CONTROL GRID VOLTAGE AS PARAMETER Vg2=360V cW ~ISSUE 2 EL34 357-8
  • 9. OUTPUT PENTODEOutput pentode rated for 25W anode dissipation,intended for use in a.c. mains operated equipment.
  • 10. OUTPUT PENTODE Output pentode rated for 25W anode dissipation, intended for use in a.c. mains operated equipment. ~(.;.w.J (000000 00000 O Oj)~O~OO--m ;!i , .+~.. I l .I 0 2 -:1 ~ , -ti :J, I I ~ >-- + ~ ~ ~- -o .-! ~:, 1. »c:~$ :;. ~~.~! c :. .. ]~ . & ::r;. , ., ~ ~Ei 05::=. !(VUI)1 0 ~ ~ (..IU,)(I6-I!).!~ ~ o o 0 . ~ NPERFORMANCE OF TWO EL34 IN PUSH-PULL WITH DISTRIBUTED LOAD CONDITIONS. SCREEN-GRID TAPPING AT 43% OF PRIMARY TURNSISSUE 2 EL34 105610 @
  • 11. OUTPUT PENTODEOutput pentode roted for 25W onode dissipotion,intended for use in a.c. mains operated equipment. . ~ c 0 > Q E ° OM ::;. ~: ~ + (vw)I ~ l""A)U!A ~ 0 . ~ ~Ofo) ...0 ~ 2PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS AND Vb=375VISSUE 2 e EL.34 1056-1 f
  • 12. OUTPUT PENTODE Output pentode rated for 25W anode dissipation, intended for use in a.c. mains operated equipment. ;; 12 .,"; " , " (Vw)1 9 9 8 o -~- " - , ( .."A ) U!A O -0 0 . ~ (010) .O.a ~ ~PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS AND Vb=425VISSUE 2 EL34 1056-12
  • 13. OUTPUT PENTODEOutput pentode rated for 25W anode dissipation,intended for use in a.c. mains operated equipment.PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH SEPARATE ANODEAND SCREEN-GRID VOLTAGE SUPPLIES AND FIXED BIAS V"(b)=SOOV, Vg2(b)=400VISSUE 2 EL34 256-13 @
  • 14. OUTPUT PENTODE Output pentoderated for 25W anode dissipation, intended for use in a.c. mains operated equiPment.PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH SEPARATE ANODEAND SCREEN-GRID VOLTAGE SUPPLIES AND FIXED BIAS Va(bl=800V. V"(b)=400VISSUE 2 EL3. 256.11 1@
  • 15. OUTPUT PENTODEOutput pentode rated for 25W anode dissipation,intended for use in a.c. mains operated equipment.PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH CATHODE BIAS AND Vb=37SVISSUE 2 EL34 1056-15 ~
  • 16. OUTPUT PENTODEEL34ISSUE 2 EL34 1056-16
  • 17. OUTPUT PENTODEOutput pentode rated for 25W anode dissipation,intended for use in a.c. mains operated equiPment.PERFORMANCE OF TWO EL34 IN PI,JSH-PULL TRIODE CONNECTEDISSUE 2 EL34 1056-17