Design Max Absolute Max. 32 Heater-cathode voltage Bulb temperature 250

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1 THE M-O ALE COMPANY LIMITED BEAM TETRODE BRIEF DATA A beam tetrode with an absolute maximum anode dissipation rating of 30 w It is designed for use in the output stage of an af amplifier or as a series valve in a stabilized power supply The is a commercial version of the C1075 HEATER Heater voltage 63 Heater current (approx) 1 3 A MAXIMUM RATINGS Design Max Absolute Max DC anode voltage 500 DC screen voltage 500 Negative dc grid voltage 200 DC cathode current 200 Anode dissipation 25 Screen dissipation 3 5 * Anode and screen dissipation Heater-cathode voltage Bulb temperature External grid-cathode resistor (cathode bias): Pa+ g 2';;; Pa+ g 2 > External grid-cathode resistor (fixed bias): Pa+ g 2 ;;; 27 Pa+ g 2 > *Triode or ultra linear operation CAPACITANCES (Measured on a cold unscreened valve) c Mn Grid to all less anode Anode to all less grid Anode to grid pf pf pf A member of the GEC Group of Companies 1977 The M-O alve Co Ltd April 1977 Issue 5

2 CHARACTERISTICS Tetrode Connection DC anode voltage DC screen voltage Negative dc grid voltage Mutual conductance I nternal anode resistance N Triode Connection DC anode voltage Negative dc grid voltage Mutual conductance I nternal anode resistance N TYPICAL OPERATION Triode Connection Class A Single alve Cathode Bias b a(, iapr;x) jn(pk) Rk 1a+g2(o) Pa+g2(o) RL Pout Dtot il Triode Connection Class AB 1 Push-Pull Cathode Bias b 440 a,g2 ' 400 -g1 (approx) 38 jn(g1-g1) (pk) 76 *Rk 2 x 615 il 1a+g2(o) Pa+g2(o) RUa-a) Pout 2 x 55 2 x x 62 2 x Dtot tlm lout *It is essential to use two separate cathode bias resistors t I ntermodulation distortion : measured using two input signals at 50 and 6000 Hz (ratio of amplitudes 4: 1) x 345 Page 2

3 Tetrode Connection Class AB1 Push-Pull Cathode Bias \b{a)(o) \b{a)(max sig) a(o) a{max sig) g2(o) g2(max sig) - g1 (approx) la(o) la(max sig) 192(0) 192(max sig) Pa(o) Pa(max sig) Pg2(0) Pg2(max sig) *Rk RL(a-a) in(g1-g1 )(pk) Pout Drot * It is essential to use two separate cathode bias resistors x 52 2 x 62 2 x 25 2x9 2 x 21 2x9 2 x x 25 2 x v w n Ultra-linear Connection Push-Pull 40 Taps Class AB 1 Cathode Bias \b 450 a,g2(o) 425 a,g2lmax sig) 400 la+g2io) 2 x 625 la+g2lmax sig) 2 x 725 Pa+g2Io) 2 x 265 Pa+g2lmax sig) 2 x 13 *Rk 2 x g 1 (approx) Pout 32 RLla-a) 7 lout 9 Dtot 2 tlm 4 * It is essential to use two separate cathode bias resistors tlntermodulation distortion : measured using two input signals at 50 and 6000 Hz (ratio of amplitudes 4: 1) 35 n Page 3

4 Ultra-linear Connection Class AB1 Push-Pull 40 Taps Fixed Bi as a,g2(o) a,g2(max sig) latg2(o) latg2(max sig) Patg2(o) Patg2(max sig) *- g1 (approx) RL(a-a) jn(g1-g1) (pk) Pout Dtot tlm, lout x 35 2 x 80 2 x 18 2 x v * A negative bias range of ±25 of this value should be available for each valve tlntermodulation distortion: measured using two input signals at 50 and 6000 Hz (ratio of amplitudes 4: 1) k!1 k!1 LIFE PERFORMANCE The average life expectancy of the when operated at absolute maximum ratings (see page 1) is at least 8000 hours At a reduced rating of Pa + g2 21 a life of at least 10,000 hours should be obtained The environment must be a static one and the valve should be switched not more than = 12 times in each 24 hours A valve is considered to have reached the end of life when it is either inoperative or one or more of its characteristics have reached the following values: Pout *g m *Measured at: a g2 la 50 of initial value <55 85 N INSTALLATION The valve may be mounted in any position but when horizontal it should be orientated as shown in Fig1 No retaining device or external screening is normally necessary Adequate ventilation should be provided A pair of valves working at maximum ratings should be mounted at not less than 9 cm (35 in) between centres For the prevention of parasitic oscillation, a series resistor of !1 should be connected close to the screen tag of the valve socket hen the Page 4

5 valve is triode connected, this resistor should be connected between screen and anode A control grid series resistor of kd is also recommended I n push-pull applications having a large change in anode current between the quiescent and full output conditions, an inductance input filter circuit of good regulation should be used A badly regulated supply will cause a fall in power output and/or excessive quiescent anode dissipation BASE CONNECTIONS AND ALE DIMENSIONS 12 I1 a NP h h le k iew from underside of base Base: International Octal (B8-0) Bulb: Dome top tubular Max overall length: 135 mm Max seated length: 121 mm Max diameter: 53 mm J 4 2 s b 8 7 Fig 1 Correct orientation of the valve socket for horizontally mounting the hilst M-Q has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice M-Q accepts no liability beyond that set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein Page 5

6 ' 1155 TETROC CONNECTION g-,=+1( c, ' i -C - b,,, = 0 ' '15i =-5 = Ig, at g I = o 100 Anode voi tage () 2CO 300 =-15 =-20 1: =-3 = '-U UJ TETRODE CXlNNECTION gi 0 = ' c;;, = -: :=::=-:, =JU C 100 ; u 11,1 i AnodIz voltage () I =1-100 :+t:t:+ t 1::1!It I h JHII I11I 300 = 50 I f fu l' Page 6

7 c a40 c u lil If) 20 a o i±t,: j,: J I 11 (g I R I TRIOOE COECTION,f J, '/ f,i' } R: -a g « Anodz & Screen \Qltage () 400 :ill Em 'im BOO tt g,=+lo TETROOE CONIlECTION g = ' E c 200 u C 7\1 =0 =- 5 =-1 =- 15 =-20 oil 190 at 'Y9FO «Anode voltage () 100 Page 7

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