Home  /  Products  /  Vacuum tubes  /  GU-81M

GU-81M

Pentode for application as power amplifier or oscillator in self-excitation mode.

General information:

Cathode: directly heated, carbonized thoriated tungsten.

Envelope: glass,with base.

Height: max 26 mm.

Diameter: max 202mm.

Mass: max 1kg

Electrical parameters:

Heater voltage V ................................................................ 12.6

Heater current, A ........................................................... 11

Mutual conductance (Ua= 2kV. Ugrid2 = 600V, Ia=200mA), mA/V..........4.5-6 5

Gain (Ua= 2kV, Ugrid2=600V and 500 V,Ia=200 mA)........................ 2.5-4

Bias voltage (Ua= 2kV, Ugrid2=600V), V ................................................ 116-160

Interelectrode capacitance. pF:

input .................................................................................. 25-32

output ................................................................................ 21-26

grid 1-anode ...................................................... 0.1

grid 1-grid 3 ..................................................................... 1-4

Output power (Ua= 2 kV, Ugrid2=600V. Ubias= - 200 V. Ugrid1 (amplitude)=300V. Ia= 450

Igrid1=20mA,Igrid2=220mA) ........................................................................... 700

Limit operating values:

Filament voltage, V................................................................ 11.6-134

Anode voltage. V:

at frequencies under 6 MHz.............................................................. 3

at frequencies under 24 MHz......................................................... 2.5

at frequencies under 50 MHz........................................................... 1.5

Grid 2 voltage, V.................................................................... 600

Anode current (average value), A....................................... 0.6

Grid 1 current (average value), A........................................ 0.02

Grid 2 current (average value), A........................................ 0 2

Power dissipation, W:

anode .............................................................................. 450

anode (peak value)............................................................ 600

grid 2.................................................................................. 120

grid 1.................................................................................. 10

Envelope temperature, °C 350

You can order GU-81M from us

Russian Electronics company Russia, Moscow region, Ryazan,Sobornay square 2.

Tel: +7 (491) 227-61-51, Fax: +7 (491) 227-18-88

russian-electronics.com