6ВМ8ЕН
Vacuum tube 6BM8EH is a miniature triode - pentode with equipotential cathodes, designed to amplify low freguency voltage in radio engineering devices.
Pin arrangement Electrode -to - lead connection diagram
36° 5 6 4 7
9 1
8 2 3 8
7 3 6 4 2 5 9 Ø12 8 х 36° = 288° 1
+0.03 Ø1 - 0.07
Dimensions
Lead Name of electrode designation 1 Triode grid
2 Pentode cathode, screen, x
a beam-forming screen m
m 3 Pentode first grid m 5 .
8 4, 5 Heater 7 6 Pentode plate 7 Pentode second grid
8 Triode cathode 9 Triode plate
(Ø22.5 -2 ) mm 6ВМ8ЕН Electrical parameters
Nominal Parameters, conditions and units min max
Heater current, mA 770 930 Triode grid reverse current, µA , ( at: filament voltage 6.3 V, triode plate voltage 170 V, triode grid voltage minus 1.5 V, 0.5 resistance in triode grid circuit 1.0 M Ω ) Triode plate current, mA, ( at: filament voltage 6.3 V, triode plate voltage 170 V, triode grid voltage minus 1.5 V) 1.3 3.7 Triode slope of characteristic, mA/V ( at: filament voltage 6.3 V, triode plate voltage 170 V, triode grid voltage minus 1.5 V) 1.3 3.7 Triode amplification factor, ( at: filament voltage 6.3 V, triode plate voltage 170 V, triode grid voltage minus 1.5 V) 50 Triode cathode - heater insulation resistance, M Ω , ( at: filament voltage 6.3 V , cathode - heater voltage ± 100 V) 5.0
Pentode first grid reverse current, µA , ( at: filament voltage 6.3 V, pentode plate voltage 170 V, pentode first grid voltage minus 11.5 V, pentode second grid voltage 170 V, 0.5 resistance in pentode first grid circuit 0.51 M Ω ) Pentode plate current, mA, ( at: filament voltage 6.3 V, pentode plate voltage 170 V, pentode first grid voltage minus 11.5 V, 28 54 pentode second grid voltage 170 V) Pentode slope of characteristic, mA/V ( at: filament voltage 6.3 V, pentode plate voltage 170 V, pentode first grid voltage minus 11.5 V, 5.0 9.0 pentode second grid voltage 170 V) Pentode second grid current, mA, ( at: filament voltage 6.3 V, pentode plate voltage 170 V, pentode first grid voltage minus 11.5 V, 14 pentode second grid voltage 170 V) Pentode cathode - heater insulation resistance, M Ω , 3.3 ( at: filament voltage 6.3 V, cathode - heater voltage ± 100 V) 6ВМ8ЕН Limiting Values
Nominal Parameters, units min max
Filament voltage, V 5.7 6.9 Triode plate voltage, V 250 Pentode plate voltage, V 275 Pentode second grid voltage, V 250
Cathode - heater voltage, V ± 100 Power dissipation at the plate of triode, W 1.0 Power dissipation at the plate of pentode, W 8.0 Power dissipation at the second grid of pentode, W 2.5 Grid circuit resistance for triode, M Ω fixed bias 1.0 self - bias 1.0 First grid circuit resistance for pentode, M Ω fixed bias 0.51 self - bias 0.51 6ВМ8ЕН triode
V 0 = g 14 E V .5 13 -0 = g E 12 V -1 11 g= E
V 10 10 .5 -1 = g V E 0 9 9 2 2 V = -2 p = Е 8 8 g E V 7 7 .5 -2 g= V E 0 6 6 7 1 V = -3 p g= Е 5 5 E 5V 3. V 4 4 - 0 g= 2 E 1 = p Е 3 3
2 2
1 IN MILLIAMPERES CURRENT PlATE 1
-3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0 20 40 60 80 100 120 140 180 220 260 300
GRID VOLTAGE IN VOLTS PLATE VOLTAGE IN VOLTS 6ВМ8ЕН pentod V 1= 0 160 Eg
140 140
-4V Eg1= V 120 120 0
2
2
= V 2 0 g 7 E 1 = = p 2 100 100
E g
E
= V p 0 V 2 -8 E Eg1= 1
= 2 80 80 g
E
=
p
E
60 60 Eg1= -11.5V
40 40 V Eg1= -14 PlATE CURRENT IN MILLIAMPERES CURRENT PlATE 20 20 Eg1= -18V
Eg1= -22V Eg1= -25V -25 -20 -15 -10 -5 0 0 20 40 60 80 100 120 140 180 220 260 300 GRID VOLTAGE IN VOLTS PLATE VOLTAGE IN VOLTS