NATIONAL HIGH-FREQUENCY AMPLIFIER APPLICATIONS SHOCK, VIBRATION RATINGS HIGH TRANSCONDUCTANCE AND RATING

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1 NATIONAL 6205sd~~ Pentode FOR WIDE-BAND HIGH-FREQUENCY AMPLIFIER APPLICATIONS 8-LEAD SUBMINIATURE SHOCK, VIBRATION RATINGS SHARP-CUTOFF CHARACTERISTIC HEATER-CYCLING RATING HIGH TRANSCONDUCTANCE DESCRIPTION AND RATING The 6205 is a subminiature sharp-cutoff pentode for use in high-frequency BASING DIAGRAM circuits. Except for the incorporation of an external connection for the suppressor grid, the 6205 is identical to the The 6205 is a special-quality tube intended for use in critical industrial and 4 military applications where operational dependability is of primary importance. Features of the tube include a high degree of mechanical strength and a heater- I 3~J Y6 cathode construction capable of withstanding many thousand cycles of intermittent operation. When used in on-off control applications, the tube will maintain its emission capabilities after long periods of operation under cutoff27 conditions. GENERAL RETMA 8bC ELECTRICAL Cathode-Coated Unipotential TRIA ONCIN Heater Voltage, AC or DC ~5% Volts Lead 1--Grid Number 1 Heater Current.0.15 Amperes ~~~~~~~Lead 2--Cathode and Internal Shield Direct Interelectrod e Capacitances Lead 3-Heater With Shield Without Shield Lead 4-Grid Number 3 (Sup- Grid-Number 1 to Plate, maximum psf pressor) Input pplf Lead 5--Plate Lead 6-Heater Output JLAf ~~~Lead 7-Grid Number 2 * With external shield of inch inside diameter connected to cath~ode. (Screen) Lead 8--Cathode and Internal MECHANICAL Sil Mounting Position-Any OTIEDMNIN Envelope--T3, Glass Base--EB-lO, Subminiature Button 8 Lead 400'ooMAx..366 M1N. L.375 MAX. MIN. ~" BASE 8-LEAD L %IDI REIMA 3-1 NATIONAL ELECTRONICS A Division of Richardson Electronics, Ltd. LaFox, IL (708)

2 Page 2 MAXIMUM RATINGS ABSOLUTE MAXIMUM VALUES Plate Voltage Volts Screen Voltqge i Volts Suppressor Voltage Volts Positive DC Grid-Number 1 Voltage Volts Negative DC Grid-Number 1 Voltage Volts Plate Dissipation Watts Screen Dissipation Watts DC Cathode Current Milliamperes Heater-Cathode Voltage Heater Positive with Respect to Cathode Volts Heater Negative with Respect to Cathode Volts Grid-Number 1 Circuit Resistance Megohms Bulb Temperature at Hottest Point; :..,...220~ C CHARACTERISTICS AND TYPICAL OPERATION CLASS A 1 AMPLIFIER Plate Voltage Volts Suppressor, Connected to Cathode at Socket Screen Voltage Volts Cathode-Bias Resistor Ohms Plate Resistance, approximate Megohms Transconductalnce Micromhos Plate Current Milliamperes. Screen Current Mlimee Grid-Number 1 Voltage, approximate lb =10 Microamperes Volts CLASS A RESISTANCE-COUPLED AMPLIFIER LOW IMPEDANCE DRIVE (APPROXIMATELY 200 OHMS) anotes: Ebb 90 Volts Ebb 150 Volts Ebb = 225 Volts S. o is maximum RMS voltage output for approxi- Rkg E 0 Gif k c S an k Rc o my five percent total harmonic distortion = L~~~~~~~~2 Gain is meessured lor an output voltage of two r volts iws.- I si om;rq L'adRfar nmghs coupling capacitors (C) should be selected to ~~~give desired frequency response. Rh and Rc should be adequately by-passed HIGH IMPEDANCE DRIVE i APPROXIMATELY look OHMS) RLb Rg ŽŽ... Volts Ebb 150 Volts Ebb 225 Volt -L - fregrhr2or hr og Ei ( , Ebb

3 CHARACTERISTICS LIMITS 6205 Page 3 Minimum Maximum Heater Current Ef =6.3 volts.i nitial Milliamperes 500-Hr Milliamperes Plate Current Ef =6.3 volts, Eb =100 volts, Ec2 =100 volts, Rk= 150 ohms (bypassed), g3 tied to k.i...,....~~~~~~~nitial Milliamperes Screen Current Ef = 6.3 volts, Eb = 100 volts, Ec2 = 100 volts, Rk = 150 ohms (bypassed), g3 tied to k.i nitial Milliamperes Transconductance (1) Ef = 6.3 volts, Eb = 100 volts, Ec2 = 100 volts, Rk =150 ohms (bypassed), g3 tied to k.i...nitial Micromhos Transconductance Change with Heater Voltage Difference between Transconductance (1) and Transconductance at Ef = 5.7 volts (other conditions the same) expressed as a percentage of Transconductance (1).I...~nitial Percent 500-Hr Percent Transconductance Change with Operation Difference between Transconductance (1) initially and after operation expressed as a percentage of initial value...., Hr Percent Average Transconductance Change with Operation Average of values for "Transconductance Change with Operation" Hr Percent Plate Resistance Ef = 6.3 volts, Eb = 100 volts, Ec2 = 100 volts, Rk =1i50 ohms (bypassed), g3 tied to k.i nitial Megohms Plate Current Cutoff Ef =6.3 volts, Eb = 100 volts, Ec2 = 100 volts, Edl = volts, g3 tied to k.i...nitial Microamperes Interelectrode Capacitances Grid-Number 1 to Plate (gi to p).i nitial pp~f Input (gi to h, k, g2, g3).i..._~~~~~~~nitial pjf Output (p to h, k, g2, g3). -...Initial ~c&f Measured with external shield of inch inside diameter connected to cathode. Negative Grid-Number 1 Current Ef =6.3 volts, Eb =100 volts, Ec2 =100 volts, Rk= 150 ohms (bypassed), Rgl = 1.0 meg, g3 tied to k....,,initial Microamperes 500-Hr Microamperes Heater-Cathode Leakage Current Ef =6.3 volts, Ehk =100 volts Heater Positive with Respect to Cathode.I..... nitial Microamperes 500-Hr Microamperes Heater Negative with Respect to Cathode.I nitial 5.0 Microamperes 500-Hr Microamperes

4 Page 4 CHARACTERISTICS LIMITS.-(ContInued) Minimum Maximum Interelectrode Leakage Resistance Ef =6.3 volts. Polarity of applied d-c interelectrode voltage is such that no cathode emission results. Grid-Number 1 to All at 100 Volts DC.I..... nitial Megohms 500-Hr Megohms Plate to All at 300 Volts DC Initial Megohms 500-Hr Megohms Vibrational Noise Output Voltage, RMS Ef = 6.3 volts, Ebb = 100 Volts, Ec2 = 100 volts, Rk = 150 ohms (bypassed), RL = 10,000 ohms, g3 tied to k, vibration acceleration = 15 G at 40 cps... Initial Millivolts Grid-Number 1 Emission Current Ef =75 volts, Eb=100 volts, Ec2=100 volts, Ecl = -9.0 volts, Rg = 1.0 meg, g3 tied to k.... Initial Microamperes The indicated 500-hour values are life-test end points for the following conditions of operation: Ef =6.3 volts, Eb = 100 volts, Ec2 =100 volts, Rk =150 ohms, g3 tied to k, Rg 1 =1.0 meg, Ehk =200 volts with heater positive with respect to cathode, and bulb temperature =220 C. SPECIAL TESTS AND RATINGS Stability Life Test' Statistical sample operated for one hour to evaluate and control initial variations in transconductance. Survival Rate Life Test Statistical sample operated for one hundred hours to evaluate and control early-life electrical and mechanical inoperatives. Heater-Cycling Life Test Statistical sample operated for 2000 cycles minimum to. evaluate and control heater-cathode defects. Conditions of test include Ef =7.0 volts cycled for one minute on and four minutes off, Eb = Ec3 = Ec2 =Ecl =0 volts, and Ehk = 140 volts RMS. Shock Rating--450 G Statistical sample subjected to five impact accelerations of 450 G in each of four different positions. The accelerating forces are applied by the Navy-type, High Impact (flyweight) Shock Machine for Electronic Devices or its equivalent. Fatigue Rating-2.5 G Statistical sample subjected to vibrational acceleration of 2.5 G for 32 hours minimum in each of three different positions. The sinusoidal vibration is applied at a fixed frequency between 25 and 60 cycles per second. Altitude Rating--60,000 Feet Statistical sample subjected to pressure of 55 millimeters of mercury to evaluate and control arcing and corona. Note: The conditions for some of the indicated tests have deliberately been selected to aggravate tube failures for test and evaluation purposes. In no sense should these conditions be interpreted as suitable circuit operating conditions. In the design of military equipment employing this tube, reference should be made to the appropriate MIL-E-1 B specification.

5 20-IIII AVERAGE PLATE CHARACTERISTICS W 6205 Page 5 lb 0 VOLTS Ef RATED VALUE Ecj = 0 VOLTS B 1 I I I I I li I I I I -II III II IEcz =IOO VOLTS $ 15t -- - I I -0. -I.0 I-~ ~~~~~~~~~~~~r PLATE VOLTAGE H VOLTS AVERAGE PLATE CHARACTERISTICS FEBRUARY 17, ~~~~~~~~~~~~~~~~~~~, VLT K 5tlHlttH~ttttt~l~ff t i i PLATE VOLTAGE N VOLTS

6 Page 6 AVERAGE TRANSFER CHARACTERISTICS 28 E~~~~~~GIDNME 1 VOTG H OTSFBRAY GRID-NUMBER 1 VOLTAGE HN VOLTS FBKAY1.15

7 Page 7 AVERAGE TRANSFER CHARACTERISTICS Ef-'RATED VALUE - - Eb 150 VOLTS =~ 0 VO LTS ~~~~~~~~~~000 I~~~~~~~Y II - o ~~~4000 Z *2-1 0 GRID-NUMBER I VOLTAGE IN VOLTS

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