<< KT88/6550 Vacuum Tube

Classification- It is a beam pentode. Dome-type bulb of glass, copper ceramic base with eight golden pins, oxide coated cathode of indirect heated, Carbon Plate.

Application -Audio amplifier of power.

Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, and 2.

Fig 1
Fig 2

Nominal operating conditions and parameters
Heater voltage 6.3V
Heater current 1.6A
Plate voltage 250V
Grid 2 voltage 250V
Grid 1 voltage -15V
Plater resistance 12kohms
Plate current 140mA
Grid 2 current (max) 7mA
Amplification factor 8
Mutual Conductance 11.5mA/V

Characteristics-Average characteristics
Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage 600V
Maximum Grid 2 Voltage 500V
Maximum Grid 1 voltage -200V
Maximum Power of plate 42W
Maximum Power of Grid 2 8W
Maximum Power of plate and Grid 2 46W
Maximun plate Current 230mA