OUTPUT PENTODE

Output pentode rated for 25W anode dissipation, intended for use in ac. mains operated equipment.

E134

HEATER Vh Iii

CAPACITANCES

coat

cmn

ca-gi cgl-li Ch-k

6.3 V 1.5 A

8.4 pF 15.2 pF

<1.0 pF <1.0 pF 11 pF

CHARACTERISTICS

Pentode connection Triode connection (g2 connected to a)

V„ 250 V V0 250 V Vgz 250 V I;, 70 mA V, :3 0 V Vgi -15.5 V I„ 100 mA gm 11.5 mA/V Ig2 15 mA ra 910 S2 Vgi -12.2 gm 11 ra 15 iag1-g2 11

V mA/V

kit

µ 10.5

Vgi max. (Igi = +0.31LA) —1.3 V

OPERATING CONDITIONS AS SINGLE VALVE CLASS "A" AMPLIFIER

Pentode connection

Va 250 300 V Vg2 250 300 V Vg3 0 0 V Rk 106 190 S2 Ra 2.0 3.5 k≤1 Ia 100 83 mA Ig2 15 13 mA Vin(r.m.s.) (Pout = 50mW) 500 450 mV Vinlr.m.s.) 8.0 8.2 V

* Pout 11 11 W *Dtot 10 10 %

* ?out and Di01 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 a reduction in power output of approximately 10%.

JANUARY 1964 Page D1

E134 OUTPUT PENTODE

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 kit Rk (per valve) 500 S2 Ra- a 7.0 kit la(o) 2 x 55 mAF Ig2(o) 2 x 9.0 mAF Vin(gl—gl)r.m.s. 55.2 V Pout 40 W Dtot 4.5 % la(max.sig.) 2x74 mA lg2(max. sig.) 2 x 9.0 mA

Distributed load conditions for minimum distortion (with screen-grid tapping at 43% of primary turns)

Vb Rg2 (per valve)

430 1.0

430 1.0

V kit

Rk (per valve) 470 470 12 Ru- a 6.0 6.0 k12 l a(o ) 2> 62.5 2 x 62.5 mA 1g2(o) 2 x 10 2 x 10 mA Vin(gl-gl)r.m.s. 35 50 V Pout 20 34 W Dtot 0.35 2.5 % Ia (max, slg.) 2 x 65 2 x 70 mA Ig2(max. sig.) 2x10.2 2 x 14 mA

OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL

Fixed bias

Vb 375 400 V Vg3 0 0 V

*Rg2 600 800 12 Vgl -33 -36 V Ra—a 3.5 3.5 k12 la(o) 2x 30 2x30 mA 1g2(o) 2x4.7 2x4.5 mA Vin(gl—gl)r.m.0. 46.7 50 V Pout 48 54 W Dtot 2.8 1.6 la(max. sig.) 2x107.5 2x110.5 mA Ig2 (max. sig.) 2x 23.5 2x23 mA

*Screen-grid resistor common to both valves.

JANUARY 1964 Page D2

OUTPUT PENTODE E134

Cathode bias

2

2

Vi, 375 Vg3 0 * Rg2 0.47

Rk (per valve) 260 Ra_a 3.5 la(o) 2 x 75 'g2(o) 2x12.5 Vin(gl—gl)r.m.s. 40 Pont 35 Dtot 1.7 Ia(max. sig.) 2 x 94 Ig2(max. sig.) 2x19.5

*screen-grid resistor common to both valves.

450 V 0 V 1.0 Id

465 S2 6.5 k[

2 x 60 mA x 10 mA

54 V 40 W

5.1 % 2x71.5 mA

x 22 mA

OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL Triode connection (g2 connected to a, g3 to k) with separate cathode

bias resistors.

With Rk bypassed

Vb

Va Vg3

Rk (per valve) Ra—a la(o) Vin(gl—gl)r.m.s.

Pout Dtot Ia(max. sig.)

With Rk unbypassed

Vb

Va Vg3

Rk (per valve) Ra—a Ia(o) Vin(gl—gl)r.m.s.

Pout Dtot Ia(max. sig.)

APRIL 1962

(( M`u`llaarrd i

V

430 V 400 V 0 V

440 S? 5.0 kL(

2x70 mA 48 V 19 W 1.8

2x75 mA

430 V 400 V 0 V

440 ~≥ 10 Id)

2x70 mA 48 V 14 W 0.4 %

2 x 73 mA

Page 03

E134 OUTPUT PENTODE

OPERATING CONDITIONS FOR TWO VALVES IN

WITH CONTINUOUS SINE WAVE DRIVE

Fixed bias

PUSH-PULL

Vu 375 400 V

V53 0 0 V

R52 1.0 1.5 kS2

Vgl —32 —35.5 V

Ra_a 3.5 3.5 kS

la(, ) 2><30 2 x 30 mA

152(0 ) 2>< 4.4 2 x 4.4 mA

Vin(g1—gi)r.,n... 45 50 V

Ponr, 42 51 W

D0 t 3.0 1.8 °,,

la(rnax. sig.) 2>< 98 2 x 106 mA

Ig2(rnas. sig.) 2x19 2x21 mA

Cathode bias Any of the cathode bias conditions published in this data sheet 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

pee max. 8.0 W

l max. 150 mA

R51—x max. 500 kQ

Vi,_(, max. 100 V

max. 20 k12

Triode connected Va max. 600 pa-i e5 max. (Va = 500V) 30

Pa- g2 max. (Va = 600V) 15

V W W

APRIL 1962 M~uullaarrd

Page D4

OUTPUT PENTODE E134

62991

g3

gl

kh h

g2

g3 k

Octal Base

h

All dimensions in mm

Th

33.3 max

x a E N

JANUARY 1960 (1) Mullard

V Page DS

O

e

O

OUTPUT PENTODE E134

EL 34

Ia

192

-40 -20 0

i.M

-

1

4130

O U) N

V91(V) -60

i (m A)

400

300

200

100

0

ANODE AND SCREEN-GRID CURRENTS PLOTTED AGAINST CONTROL-GRID VOLTAGE WITH ANODE AND SCREEN-GRID VOLTAGES AS

PARAMETERS

~1 Muul laarrd

JANUARY 1960 (I) Page Cl

E134 OUTPUT PENTODE

O, -

> > In N N

1

> O T

1

I 1

0

0

0

0

0

i ,I> In

1 1 1 1 1

I I

0 >a

i 1 1 I

1 1 I I

1 1 1

1

1

1 11 I

I

/Pt1 Pt I

1 ,

InCMN P

a°

t I

8

/

i

> >o

O V

0 Ih

O O N

0 0

O

oa E 0) CM

O O

ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITH CONTROL-GRID VOLTAGE AS PARAMETER

JANUARY 1960(1)

~1 M`u`llaarrd

V Page C2

OUTPUT PENTODE E134

EL34

Triode connected

I

Io

(m A)

200

150

100

50

ANODE CURRENT PLOTTED AGAINST CONTROL-GRID VOLTAGE WITH ANODE VOLTAGE AS PARAMETER WHEN TRIODE CONNECTED

JANUARY 1960 (1) Page C3

EL34 OUTPUT PENTODE

V M J W

Triode connected

InM

1

>

O

>

In

>

O N

>

In N

8.4

r I

I 4. I

1

1. 1 >

1

4"

1S.

I

1a m C

O O V

O O M

O O N

O O

O

O Q H E

O O O

N 8 O

ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITH CONTROL-GRID VOLTAGE AS PARAMETER WHEN TRIODE CONNECTED

JANUARY 1960 (1) Page C4

OUTPUT PENTODE E134

(O

a 0 O \

N

H 1 ■

'—U

'U I—. ~w■ Iw■

O M

W 'I I'

3

a~

O

m

(O

a

N

O

O O 1') N

O O

YI c E 2 ' >ya `

N 0 O

PERFORMANCE OF EL34 WHEN USED AS A SINGLE VALVE CLASS `A' AMPLIFIER. Va = 250V

JANUARY 1960 (1) Mauullaarrd

V Page CS

E134 OUTPUT PENTODE

PERFORMANCE OF EL34 WHEN USED AS A SINGLE VALVE CLASS 'A' AMPLIFIER. Va = 300V

JANUARY 1960 (1)

- 1 M`u`llaarrd

V Page C6

OUTPUT PENTODE E134

Io 0)rnM

r17

w

'^ o c o m

L a

caC-Oy

~ U

OC L o rn E

C Yd n

a O ~ d aL L o

O ~3N

*P

er

val

ve

0 8 N

8

O

3 3 O a-

O v

O

0 N

O

O

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH DISTRIBUTED LOAD CONDITIONS. SCREEN-GRID TAPPING AT 20 OF PRIMARY TURNS

JANUARY 1960 (1)

l~ M`uulla/rrd

V Page C7

E134 OUTPUT PENTODE

o ~- a

rnaO a

00 C rnO Ca •aye 9 aC

L

U y

S~~ mo

V N ~a

7 L N~

a 3a

* *

a

a

>

0 a

a M J W i

I

I

i 1

$Y E

O O O

O~ N

C >

O

a

M

O N

O

O

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH DISTRIBUTED LOAD CONDITIONS. SCREEN-GRID TAPPING AT 43% OF PRIMARY TURNS

JANUARY 1960 (1)

f l M`u`llaarrd

V Page C8

OUTPUT PENTODE E134

I

HE c o 0

>

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS V7, = 375V

O

0

JANUARY 1960 (1) Muliard

Page C9

E134 OUTPUT PENTODE

m C)rnM a

> a

Ca

a

3 a a°

O v

1 N

O

O

os-a (O O N O

H E

8 O O

N

O

O Y (O

01

C>

>

O

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS Vb = 400V

JANUARY 1960 (1) M`n`l~la/Jr'd I

V Page C10

N p

OUTPUT PENTODE E134

N H H

>

N

J W

Q C: Ci sh

>co RO N'; N N V N N "

N •

> K D H *

\\\

04

x N

S L

8 2

N O

b 0 N

N2 0 0 0 0 0

u

0 L (O V N 0

0

In N

O N

N

O

Ii)

0

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH CATHODE BIAS Vb = 375V

JANUARY 1960 (1) Mullard I

V Page 0711

o^

E134 OUTPUT PENTODE

m 0)rn

a

U)w

O

UW

Y

>

ya i

a°

O Q

O N

O

O

e4N

O O O

O O O V N

4

0-

w O

J

PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH CATHODE BIAS V1, = 450V

JANUARY 1960 (1) ) Page C12

t0

OUTPUT PENTODE E134

0 rnr~

aT

CC_

>

v M W

Trio

de

connecte

d

3

0 a

0 N

N

O

JO

O

O N O

oe O"

c N O

O

PERFORMANCE OF TWO EL34 IN PUSH-PULL WHEN TRIODE CONNECTED AND THE CATHODE BYPASSED

JANUARY 1960 (1) Page C13

HE

E134 OUTPUT PENTODE

IO1 M

b

a0 a

C 0 S

0 > S a *

0 H

0 1 0)

C

>

0

O

O -JUW

Triode connected i i

a~

~D

N

O

a

oa ~ 8 O

~E I a N 9 >~

In O N O

PERFORMANCE OF TWO EL34 IN PUSH-PULL WHEN TRIODE CONNECTED AND THE CATHODE UNBYPASSED

JANUARY 1960 (1) Page C14