TUBE: EL86
SOURCE: sheets/129/e/EL86.pdf
FABRICANT: Mullard
ANNEE: October 1960 (1)
LANG: English (en)

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EL86 — OUTPUT PENTODE
Low impedance output pentode suitable for use in single-ended push-pull output stages and series regulators.
HEATER: Vh = 6.3 V; Ih = 760 mA
CAPACITANCES (measured without an external shield):
 cin   = 13 pF
 cout  = 6.8 pF
 ca-g1 < 600 mpF  (< 0.6 pF)
 ch-g1 < 250 mpF  (< 0.25 pF)
CHARACTERISTICS — Pentode connection (two columns):
 Va  = 100 / 170 V
 Vg2 = 100 / 170 V
 Vg1 = -5.0 / -12.5 V
 Ia  = 57 / 70 mA
 Ig2 = 3 / 3.5 mA
 gm  = 13 / 11 mA/V
 mu(g1-g2) = 9 / 8
 ra  = 23 / 26 kOhm
 Vg1 max. = -1.3 V
CHARACTERISTICS — Triode connection (g2 connected to a):
 Va  = 100 / 170 V
 Vg1 = -5.0 / -12.5 V
 Ia  = 60 / 74 mA
 gm  = 14 / 12 mA/V
 mu  = 9 / 8
 ra  = 645 / 665 Ohm
OPERATING CONDITIONS AS SINGLE VALVE CLASS 'A' AMPLIFIER:
 Va(b) = 200 V; Vg2(b) = 200 V; Rk = 215 Ohm; Ra = 2.5 kOhm; Rg2 (unbypassed) = 470 Ohm
 Ia = 64 mA; Ig2(o) = 3.2 mA; Vin(rms) (Pout=50mW) = 520 mV; Vin(rms) = 7.0 V
 Pout = 5.3 W; Dtot = 10 %; Ig2 (max.sig.) = 11.4 mA

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OPERATING CONDITIONS FOR TWO VALVES IN SINGLE ENDED PUSH-PULL:
[circuit: 5.6kOhm, 8uF, 1kOhm, 120 Ohm, 50uF, Ra]
 Vb = 300 V; Ra = 1.0 kOhm; Ib(o) = 66 mA; Ib (max.sig.) = 64 mA
 Vin(rms) = 5.4 V; Pout = 4.5 W; Dtot = 9.3 %
OPERATING CONDITIONS FOR TWO VALVES IN CLASS 'AB' PUSH-PULL — Speech and music:
 Va-k = 250 V; Vg2-k = 200 V; Rk (per valve) = 300 Ohm; Ra-a = 5.5 kOhm
 Ia(o) = 2x50 mA; Ia(max.sig.) = 2x55 mA; Ig2(o) = 2x2.0 mA; Ig2(max.sig.) = 2x13 mA
 Vin(g1-g1)rms = 26 V; Pout = 18.5 W; Dtot = 4.5 %
Continuous sine wave drive (three columns):
 Va-e = 190 / 220 / 250 V
 Vg2(b) = 190 / 220 / 250 V
 Rk (per valve) = 220 / 270 / 390 Ohm
 Rg2 (common) = 330 / 1000 / 1800 Ohm
 Ia(o) = 2x61 / 2x59 / 2x51 mA
 Ig2(o) = 2x2.8 / 2x2.7 / 2x2.4 mA
 Ra-a = 2.6 / 3.0 / 3.5 kOhm
 Pout = 13.3 / 15.7 / 17.4 W
 Vin(g1-g1)rms = 24 / 29 / 39 V
 Dtot = 2.3 / 3.3 / 4.2 %
 Ia (max.sig.) = 2x69 / 2x69 / 2x64 mA
 Ig2 (max.sig.) = 2x10 / 2x9.7 / 2x8.7 mA
 Vin(g1-g1)rms (Pout=50mW) = 930 / 920 / 960 mV

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LIMITING VALUES:
 Va(b) max. = 550 V
 Va max. = 250 V
 Va+g2 max. = 250 V
 pa max. = 12 W
 pa+g2 max. = 13 W
 Vg2(b) max. = 550 V
 Vg2 max. = 250 V
 pg2 max. = 1.75 W
 Ik max. = 100 mA
 Rg1-k max. = 500 kOhm
 Vh-k max. = 200 V
 Rh-k max. = 20 kOhm
DIMENSIONS / CONNECTIONS — B9A Base (Noval), 22.2 mm max dia; 71 / 78 mm max height.
Pinout (B9A): a (top, via internal? shown as side a); pins:
 pin1 = IC; pin2 = g1; pin3 = k,g3; pin4 = h; pin5 = h; pin6 = IC; pin7 = a; pin8 = IC; pin9 = g2
 (electrode view: a top; g1, g2 sides; k,g3 h h bottom)