SPECIFICATIONS :

Valve Type: KT88 Diamond Size (including socket): 5.2 x 12.5cm CHARACTERISTICS Plate dissipation (max): 35 W Grid Dissipation (max): 6 W Cooling: Radiation Heater Voltage: 6.3 V Heater Current: 1.6 A MAXIMUM RATINGS Anode Voltage: 800 V Screen Grid Voltage: 600 V Va, g2: 600 V - Vgl: 200 V Pa: 35 W Pg2: 6 W Pa + g2: 40 W Ik: 230 mA Vh k: 200 V Tbulb: 250°C CAPACITANCES (measured on a cold unscreened valve) Triode Connection Cgl g2: 7.9 pF Cg1 all less a, g2: 9.8 pF Ca, g2 17 pF Tetrode Connection Cg1 1.3 pF Cg 1 all less a: 17 pF Ca g1: 12 pF Push Pull, Class AB 1, Cathode Bias, Ultra-linear Connection (40% tapping points) Vag2 (b): 500 375 V Vag2 (o): 436 328 V Ia + g2 (o): 2 x 87 2 x 87 mA Ia + g2 (max sig): 2 x 99 2 x 96 mA RL a): 6 5 k Ohms * Rk: 2 x 600 2 x 400 Ohms -Vg1 (approx): 52 35 V Pout: 50 30 W Dout: 1.5 1% I.M.D: 4 3% Wa + g2 (o): 2 x 38 2 x 28.5 W Wa + g2 (max sin): 2 x 17 2 x 16 W V g1 g1 ac: 104 71V Zout: 4.8 4.5 k Ohms * It is essential to use two separate cathode bias resistors. I.M.D intermodulation distortion measured using two input signals at 50 and 6000 Hz (ration of amplitudes 4:1) Push Pull, Class AB 1, Cathode Bias, Triode Connection Vag2 (b): 400 485 V Vag2 (0): 349 422 V Ia + g2 (o): 2 x 76 2 x 94 mA Ia + g2 (max sig): 2 x 80 2 x 201 mA RL 4 4 k Ohms -Vg1 (approx): 40 50 V Pout: 17 31 W Dout: 1.5 1.5% I.M.D: 5.6 5.6% Wa + g2 (o): 2 x 26.5 2 x 40 W Wa + g2 (max sin): 2 x 29 2 x 27 W V g1 g1 ac: 78 114 V Rk: 2 x 525 2 x 525 Ohms Zout: 4.8 4.5 k Ohms I.M.D intermodulation distortion measured using two input signals ay 50 and 6000 Hz (ratio of amplitudes 4:1)