TUBE: EL34 SOURCE FILE: sheets/129/e/EL34.pdf MANUFACTURER: Mullard YEAR: data sheets dated January 1964 (D1, D2), April 1962 (D3, D4), January 1960 (D5 + curves) PAGES: 19 (pages 1-5 = data D1-D5, pages 6-19 = curves C1-C14) TYPE (per PDF): OUTPUT PENTODE ===== PAGE 1 (D1, JANUARY 1964) ===== EL34 — OUTPUT PENTODE Output pentode rated for 25W anode dissipation, intended for use in a.c. mains operated equipment. HEATER: Vh = 6.3 V ; Ih = 1.5 A CAPACITANCES: Cout 8.4 pF Cin 15.2 pF Ca-g1 <1.0 pF Cg1-h <1.0 pF Ch-k 11 pF CHARACTERISTICS Pentode connection: Triode connection (g2 connected to a): Va = 250 V Va = 250 V Vg2 = 250 V Ia = 70 mA Vg3 = 0 V Vg1 = -15.5 V Ia = 100 mA gm = 11.5 mA/V Ig2 = 15 mA ra = 910 ohm Vg1 = -12.2 V mu = 10.5 gm = 11 mA/V ra = 15 kohm mu(g1-g2) = 11 Vg1 max. (Ig1 = +0.3uA) = -1.3 V OPERATING CONDITIONS AS SINGLE VALVE CLASS "A" AMPLIFIER — Pentode connection (two columns) Va = 250 / 300 V ; Vg2 = 250 / 300 V ; Vg3 = 0 / 0 V ; Rk = 106 / 190 ohm ; Ra = 2.0 / 3.5 kohm ; Ia = 100 / 83 mA ; Ig2 = 15 / 13 mA ; Vin(rms)(Pout=50mW) = 500 / 450 mV ; Vin(rms) = 8.0 / 8.2 V ; Pout = 11 / 11 W ; Dtot = 10 / 10 % (*Pout and Dtot measured at fixed bias.) ===== PAGE 2 (D2, JANUARY 1964) ===== OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL Distributed load conditions for maximum output (screen-grid tapping at 20% of primary turns): Vb = 450 V ; Rg2(per valve) = 1.0 kohm ; Rk(per valve) = 500 ohm ; Ra-a = 7.0 kohm ; Ia(o) = 2x55 mA ; Ig2(o) = 2x9.0 mA ; Vin(g1-g1)rms = 55.2 V ; Pout = 40 W ; Dtot = 4.5 % ; Ia(max.sig) = 2x74 mA ; Ig2(max.sig) = 2x9.0 mA Distributed load conditions for minimum distortion (screen-grid tapping at 43% of primary turns) (two cols): Vb = 430 / 430 V ; Rg2 = 1.0 / 1.0 kohm ; Rk = 470 / 470 ohm ; Ra-a = 6.0 / 6.0 kohm ; Ia(o) = 2x62.5 / 2x62.5 mA ; Ig2(o) = 2x10 / 2x10 mA ; Vin(g1-g1)rms = 35 / 50 V ; Pout = 20 / 34 W ; Dtot = 0.35 / 2.5 % ; Ia(max.sig) = 2x65 / 2x70 mA ; Ig2(max.sig) = 2x10.2 / 2x14 mA Fixed bias (two columns): Vb = 375 / 400 V ; Vg3 = 0 / 0 V ; *Rg2 = 600 / 800 ohm ; Vg1 = -33 / -36 V ; Ra-a = 3.5 / 3.5 kohm ; Ia(o) = 2x30 / 2x30 mA ; Ig2(o) = 2x4.7 / 2x4.5 mA ; Vin(g1-g1)rms = 46.7 / 50 V ; Pout = 48 / 54 W ; Dtot = 2.8 / 1.6 % ; Ia(max.sig) = 2x107.5 / 2x110.5 mA ; Ig2(max.sig) = 2x23.5 / 2x23 mA (*Screen-grid resistor common to both valves.) ===== PAGE 3 (D3, APRIL 1962) ===== Cathode bias (two columns): Vb = 375 / 450 V ; Vg3 = 0 / 0 V ; *Rg2 = 0.47 / 1.0 kohm ; Rk(per valve) = 260 / 465 ohm ; Ra-a = 3.5 / 6.5 kohm ; Ia(o) = 2x75 / 2x60 mA ; Ig2(o) = 2x12.5 / 2x10 mA ; Vin(g1-g1)rms = 40 / 54 V ; Pout = 35 / 40 W ; Dtot = 1.7 / 5.1 % ; Ia(max.sig) = 2x94 / 2x71.5 mA ; Ig2(max.sig) = 2x19.5 / 2x22 mA (*Screen-grid resistor common to both valves.) OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL — Triode connection (g2 to a, g3 to k) with separate cathode bias resistors: With Rk bypassed: Vb=430 V ; Va=400 V ; Vg3=0 V ; Rk(per valve)=440 ohm ; Ra-a=5.0 kohm ; Ia(o)=2x70 mA ; Vin(g1-g1)rms=48 V ; Pout=19 W ; Dtot=1.8 % ; Ia(max.sig)=2x75 mA With Rk unbypassed: Vb=430 V ; Va=400 V ; Vg3=0 V ; Rk(per valve)=440 ohm ; Ra-a=10 kohm ; Ia(o)=2x70 mA ; Vin(g1-g1)rms=48 V ; Pout=14 W ; Dtot=0.4 % ; Ia(max.sig)=2x73 mA ===== PAGE 4 (D4, APRIL 1962) ===== OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL WITH CONTINUOUS SINE WAVE DRIVE Fixed bias (two columns): Vb = 375 / 400 V ; Vg3 = 0 / 0 V ; Rg2 = 1.0 / 1.5 kohm ; Vg1 = -32 / -35.5 V ; Ra-a = 3.5 / 3.5 kohm ; Ia(o) = 2x30 / 2x30 mA ; Ig2(o) = 2x4.4 / 2x4.4 mA ; Vin(g1-g1)rms = 45 / 50 V ; Pout = 42 / 51 W ; Dtot = 3.0 / 1.8 % ; Ia(max.sig) = 2x98 / 2x106 mA ; Ig2(max.sig) = 2x19 / 2x21 mA Cathode bias: Any of the cathode bias conditions published are suitable for continuous sine wave drive. DESIGN CENTRE RATINGS: Va(b) max 2.0 kV Va max 800 V pa max 25 W Vg2(b) max 800 V Vg2 max 500 V pg2 max 8.0 W Ik max 150 mA Rg1-k max 500 kohm Vh-k max 100 V Rh-k max 20 kohm Triode connected: Va max 600 V pa+g2 max (Va=500V) 30 W pa+g2 max (Va=600V) 15 W ===== PAGE 5 (D5, JANUARY 1960) ===== [Dimensions and connections] Marking 6299. Octal Base. Pinout (base diagram, bottom view): a=anode top; g2; g1; g3; k; h; h; kh — arranged: pin1=g3; pin2=h; pin3=a; pin4=g2; pin5=g1; pin6=NC; pin7=h; pin8=k (k tied to internal shield kh) Dimensions: 33.3 max dia; 98 max / 112 max height. All dimensions in mm. ===== PAGE 6 (C1, 1960) ===== [courbes seules] Ia, Ig2 vs Vg1; Va=Vg2 = 400/325/250 V ===== PAGE 7 (C2, 1960) ===== [courbes seules] Ia vs Va, Vg2=250V; Pa=25W; Vg1 0 to -25V ===== PAGE 8 (C3, 1960) ===== [courbes seules] Triode connected: Ia vs Vg1; Va=500/450/400/350/300/250V ===== PAGE 9 (C4, 1960) ===== [courbes seules] Triode connected: Ia vs Va; Pa+g2=30W; Vg1 0 to -35V ===== PAGE 10 (C5, 1960) ===== [courbes seules] Class A single valve: Va=Vg2=250 Ia(o)=100mA Vg1=-12.2 Ra=2.0k ===== PAGE 11 (C6, 1960) ===== [courbes seules] Class A single valve: Va=Vg2=300 Ia(o)=83mA Vg1=-18V Ra=3.5k ===== PAGE 12 (C7, 1960) ===== [courbes seules] PP distributed load, screen tap 20%: Vb=450 Rk=500 Rg2=1k Ra-a=7k per valve ===== PAGE 13 (C8, 1960) ===== [courbes seules] PP distributed load, screen tap 43%: Va+Vbg2=430 Vbg2=425 Rg2=470 Ra-a=6k ===== PAGE 14 (C9, 1960) ===== [courbes seules] PP fixed bias: Vb=375 Ia(o)=2x30mA Vg1=-33 Rg2=600 Ra-a=3.5k ===== PAGE 15 (C10, 1960) ==== [courbes seules] PP fixed bias: Vb=400 Ia(o)=2x30mA Vg1=-36 Rg2=800 Ra-a=3.5k ===== PAGE 16 (C11, 1960) ==== [courbes seules] PP cathode bias: Vb=375 Rk=260 Rg2=470 Ra-a=3.5k Ia(o)=2x75mA ===== PAGE 17 (C12, 1960) ==== [courbes seules] PP cathode bias: Vb=450 Rk=465 Rg2=1k Ra-a=6.5k Ia(o)=2x60mA ===== PAGE 18 (C13, 1960) ==== [courbes seules] PP triode connected, cathode bypassed: Vb=400 Ia=2x70mA Rk=440 Ra-a=5k ===== PAGE 19 (C14, 1960) ==== [courbes seules] PP triode connected, cathode unbypassed: Vb=430 Ia=2x70mA Rk=440 Ra-a=10k