A2599

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 posit...