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KT88 |
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Description |
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The EAT KT88 has a designed maximum anode dissipation rating of 35W
and is recommended for use in the output stage of an a.f. amplifier. Two
valves in class AB1 give a continuous output of up to 100W. The KT88 is
also suitable for use as a series valve in stabilized power supply. Available as Single Valve, Matched Pair or Matched Quartet. |
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Specifications |
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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 –a, g2: 7.9 pF
Cg1 –all less a, g2: 9.8 pF
Ca, g2 –all less g1: 17 pF
Tetrode Connection
Cg1 –a: 1.3 pF
Cg 1 –all less a: 17 pF
Ca –all less 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 – 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 (a – a): 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)
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