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A2599 Dataheets PDF



Part Number A2599
Manufacturers GEC
Logo GEC
Description Low Noise VHF Triode
Datasheet A2599 DatasheetA2599 Datasheet (PDF)

VALVES LOW NOISE VHF TRIODE A2599 ISSUE 2 The A2599 is a low noise v.h.f. triode for grounded-cathode use. It is a commercial version of the CV5242. BASE CONNECTIONS h h k k g AND VALVE DIMENSIONS k Base: B9A k Bulb: Tubular. Max. overall length: g Max. seated length: Max. diameter: a 56mm. 49mm. 22·2mm. Viewed from underside of base. HEATER 6·3 0·3 (approx) V A MAXIMUM RATINGS (Absolute) Va pa Ik +Vs Vh-k(pk) Tbulb 250 2·5 20 20 100 200 CAPACITANCES (Measured on a cold screened val.

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VALVES LOW NOISE VHF TRIODE A2599 ISSUE 2 The A2599 is a low noise v.h.f. triode for grounded-cathode use. It is a commercial version of the CV5242. BASE CONNECTIONS h h k k g AND VALVE DIMENSIONS k Base: B9A k Bulb: Tubular. Max. overall length: g Max. seated length: Max. diameter: a 56mm. 49mm. 22·2mm. Viewed from underside of base. HEATER 6·3 0·3 (approx) V A MAXIMUM RATINGS (Absolute) Va pa Ik +Vs Vh-k(pk) Tbulb 250 2·5 20 20 100 200 CAPACITANCES (Measured on a cold screened valve) Cg-all. less a: 3·5pF; Ca-all. less g: 0'7pF; V W rnA V V °C Cg-a: 1·lpF. CHARACTERISTICS Va i, Vg gm [.1 *Cin(w) *nn(w) 130 16 -1 (approx) 15 60 6 (approx) 30 (approx) * Measured hot at 45Mc/s with anode decoupled to cathode. V rnA V mA/V pF kfl -.,------T-H-E---M--O--V-A--L-V-E-C--O-.-L-T-D-.-. --B-R-O-O-K--G--R-E-E-N-'--L-O-N--D-O-N-'---W--.6--AUGUST 1962 A2599 TYPICAL OPERATION Class A. Low Noise Amplifier. Grounded Cathode Connection. Used in the first stage of a cascode amplifier, followed by an A2521 triode, operated in grounded-grid connection, as shown in figs. I, 2 and 3. Va(b) 180 Ra 3·3 Rk 68 [a 15·5 Frequency 45 *Noise factor (average) 1·5 tNoise factor (average) 1·3 :!:Power gain (approx) 30 Optimum source resistance (approx) 1300 *Input circuit tuned. +Input circuit adjusted for lowest noise factor. tFor the cascode amplifier. 250 68 14·5 200 6·8 4·7 20 290 V kn o rnA Mcjs dB dB dB n INSTALLATION The valve may be mounted in any position. The use of a retaining device is recommended. If a screening can is used it should be blackened inside and out. Free air circulation around the bulb or the outside of the screening can should be provided. Provision of circuit information in this publication does not imply a right to use any invention which may be involved and which is the subject of patents by whomsoever owned. 2 A2599 R2 Fig. 1. Circuit of 45Mc/s cascode amplifier. COMPONENT VALUES FOR FIG. I. Valves VI A2599 V2 A2521 V3 Z77 Capacitors CI C2 to C14, C 16 CI5 2-8pF l000pF 470pF Resistors RI, R3 R2, R4, R8 R5 R6 R7 R9 RIO 6811 3·3k11 4'7kO 0·25W IW 0'25W l'OM11 1500 22k11 10011 0·25W 0·25W 0·25W 0'25W Inductances All coils of enamelled copper wire wound on ! in. dia. former. Ll L2,L6, L7 *L3 *L4 *L5 *L8 Turns 9 80 12 35 10 12 *Core is of the type recommended for use up to 100 Mc/s, s.w.g. 18 34 20 30 20 20 3 A2599 Inp,Jt stuo s ," ,I I R2 R3 (8 Fig. 2. Circuit of 200Mc/s cascade amplifier. ht + COMPONENT VALUES FOR FIGS. 2 AND 3 Resistors RI R2-R3 R4 Inductances LI L2 to L6 L7 6811. rooi o, I kll. Capacitors Cl, C6 C2, C4, C9 C3, C7, CIO C5, C8 3-30pF ceramic trimmer. 4700pF feedthrough. lOOOpF. 2000pF. It turns 14 s.w.g. copper wire tin. i.d. tapped at 1 turn from earthy end. 20!in. of 26 s.w.g. enamelled copper wire close-wound -i\rin. i.d. air-cored coil. H turns 14 s.w.g. copper wire tin. i.d. tapped at t turn from earthy end. 4 A2599 Input socket C3/;,3in. 32 ~1 L2 C2 A2599 A 2521 Output socket Fig. 3. Layout of 200Mc/s cascode amplifier. 5 A2599 b II i I J / V I/ / I !i [L'tmeasured) II II ~ I I ]I zo 2 I l/ !V : ./ 1110 a 10 Fig. 4. 50 100 (Mel.) 500 Variation in average minimum noise factor against frequency for A2599-A2521 cascode amplifiers. (FI measured using a noise diode). 1000 6 A2599 20 I ~:::.. 1702 Cl I " :::.. :::"~I Cl ...:. , I 15 :::.. V) p Ij_ ~ -';"'0",<. , l'. Si1/ ; Cl t~ -;Vj ;.. ~ ~I f-I~ ~ ';>.t ~'i ,.;,'0/ / ~~ ..;..<:::'1 5 /~ !50 100 150 200 250 Fig 5. 7 A2599 ~17~O~l~:~IJ=CIJ[=r~rT~Tl-r~rT-rTl-'''rT,-,,-r~I~,~~----20 1£ [I [ 1/ II 4 3 2 -I Vg (V) Fig. 6. RIIOI Printed in England - K-C. .


EZ81 A2599 A3064


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