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<< 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

 
 
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