RS876.pdf

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Modulator Triode
RS 876
Ordering code Q53-X876
Vapor-cooled triode with coaxial grid lead-through, particularly suitable for modulators of 200 kW to
250 kW transmitters.
FRAME4/home/SMC-Archiv-DB/GG-RO-engl/DB-Senderoehren-96_BNR-B442-P4213-X-X-7600/RS876
Dimensions in mm
Sealing surface
Approx. weight 24 kg
42
Siemens Aktiengesellschaft
Modulator Triode
RS 876
Heating
Heater voltage
Heater current
Permissible starting current
Heating: direct
Cathode: thoriated tungsten
Characteristics
Emission current
at
U
A
=
U
G
= 500 V
Amplification factor
at
U
A
= 8 to 10 kV,
I
A
= 3 A
Transconductance
at
U
A
= 8 kV,
I
A
= 3 A
Capacitances
Cathode/grid
Cathode/anode
Grid/anode
Accessories
Mounting instruction
RF terminal (2 for each tube)
Grid terminal for SW
Grid terminal for MW
Handle
Boiler
Insulating pipe at water inlet
Union at water inlet
Gasket at vapor outlet
Insulating pipe at vapor outlet
Insulator
Water level stabilizer with
control electrodes
LL electrolytic target
Gasket ring for boiler
Gasket ring for water supply line
Gasket ring for vapor outlet
RöMo876
RöKat876
RöGit876
RöGit877
RöZub876
RöKüV876
RöKüV31Zub4
RöKüV31Zub7
RöKüV201Zub8
RöKüV876Zub3
RöKüV876Zub5K
RöZubV4
RöEl41
Q1001-X24
Q1001-X13
Q1001-X11
Q1001-X101
Q1001-X42
Q81-X1634
Q81-X1637
Q81-X1678
Q81-X1610
Q81-X1659
Q81-X2105
C65055-A667-A41
C65051-A411-C552
C65055-A620-C523
C65055-A620-C526
U
F
I
F
I
F M
11
≈
155
≤
300
V
A
A
I
em
µ
42
15
40
A
s
mA/V
c
kg
c
ka
c
ga
≈
130
≈
3,8
≈
75
pF
pF
1
)
pF
Ordering code
1) Measured by means of a 50 cm diameter screening plate in the grid terminal plane.
Siemens Aktiengesellschaft
43
Modulator Triode
RS 876
AF amplifier and modulator,
class B operation, 2 tubes in push-pull circuit
Maximum ratings
Anode voltage (dc)
Grid voltage (dc)
Cathode current (dc)
Peak cathode current
Anode dissipation
Grid dissipation
Operating characteristics
U
A
U
G
I
K
I
K M
P
A
P
G
14
– 2
16
50
75
700
kV
kV
A
A
kW
W
at modulator operation for
250 kW
carrier power
200
11,5
– 720
2340
2
×
14,5
2
×
0,7
2
×
167
2
×
820
2
×
67
2
×
310
60
820
Output power
Anode voltage (dc)
Grid voltage (dc)
Peak control grid voltage (ac)
between the 2 tubes
Anode current (dc)
Grid current (dc)
Anode input power
Drive power
Anode dissipation
Grid dissipation
Efficiency
Effective load resistance
(anode to anode)
P
2
U
A
U
G
U
gg m
I
A
I
G
P
B A
P
1
P
A
P
G
η
R
AA
0
kW
kV
V
V
A
A
kW
W
kW
W
%
Ω
11,5
– 720
0
2
×
1
0
2
×
11,5
0
2
×
11,5
0
–
–
44
Siemens Aktiengesellschaft
Modulator Triode
RS 876
Tube mounting
Axis vertical, anode down.
For connection of the tube use the terminals listed under “Accessories”. The heater current is
applied via flexible strips which are attached to the tube and must not be removed. A possibly nec-
essary RF connection must be established via helix contacts at the caps below the flexible heater
strips.
Maximum tube surface temperature
The temperature of the glass-to-metal seals must not exceed 170
°C
at any point. The maximum
permissible temperature in the center of the glass bulb between grid and anode is 220
°C.
At the
ceramic cathode lead-throughs the temperature should not exceed 220
°C.
The maximum temperature difference at the bulb circumference is 50
°C,
and in axial direction
120
°C.
The temperature gradient must not exceed 25
°C/cm.
The temperature can be kept within
these limits by providing additional air cooling of the tube terminals by an adequately directed air
flow of at least 2 m
3
/min.
Vapor cooling
Cooling data for maximum anode dissipation
Total power to be dissipated by the cooling system
(P
A
+
P
G
+ 0,8
P
F
)
Equivalent thermal output
Flow rate of returning water
at returning water temperature of 20
°C
at returning water temperature of 90
°C
Volume of generated vapor
at returning water temperature of 20
°C
at returning water temperature of 90
°C
P
A max
= 75 kW
76,1 kW
4570 kJ/min (1090 kcal/min)
approx. 1,8 l/min
approx. 2,0 l/min
approx. 3,0 m
3
/min
approx. 3,3 m
3
/min
Detailed information on vapor cooling upon request. Please observe instructions on vapor cooling
given under “Explanations on Technical Data”.
Safety precautions
The section “Safety precautions” under “Explanations on Technical Data” describes how the tube
is to be protected against damage due to electric overload or insufficient cooling. A copper wire with
0,25 mm diameter should be used to test the anode overcurrent trip circuit.
Siemens Aktiengesellschaft
45
Modulator Triode
RS 876
FRAME4/home/SMC-Archiv-DB/GG-RO-engl/DB-Senderoehren-96_BNR-B442-P4213-X-X-7600/RS876
U
G
=
f
(U
A
)
Parameter =
I
A
Parameter =
I
G
46
Siemens Aktiengesellschaft

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