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QRO PA 144 MHz 20 kW GU36B-1 v2 pa gu36b-1.pdfQRO PA 144 MHz 20 kW GU36B-1 v2 Designed: YU1AW...
Transcript of QRO PA 144 MHz 20 kW GU36B-1 v2 pa gu36b-1.pdfQRO PA 144 MHz 20 kW GU36B-1 v2 Designed: YU1AW...
QRO PA 144 MHz 20 kW
GU36B-1 v2
Designed: YU1AW
Builded: YU7MS [email protected] & YU7PS [email protected]
Many thanks to all our friends for realization of this project.
03.08.2013.
YU1AW YU7PS YU7MS
Idea to build this PA raised few years ago and thanks to Dragan YU1AW we were able to bring this this project to completion. YU1AW designed the RF deck and helpedus during adjustments and tuning with his countless and selfless suggestions. Our friend Teo YU7AR has supplied us with GU36B-1 tube and built 3 phase transformer for anode power supply. Amplifier itself was originally designed to operate in grounded G2 configuration. In order to avoid high negative voltage at G1 (to make input tuning less dangerous) we have rather switched to grounded cathode configuration. That change forced us to build a quality cooling capacitor for G2. The anode resonator has been slightly shortened compared to the original design. Its diameter is 184 mm and length 500mm. RF choke is connected 202mm away from the end of the resonator. Tune capacitor is 6.6pF, made from flexible brass sheet. Load capacitor is 2.7pF, with diameter of 100mm. Its capacitance changes by shifting the brass disc. Anode is being cooled by two radial turbines producing 76mm H2O and 985m3/h air flow. Two smaller turbines are used to cool down the cathode compartment and transformers for all other power supplies. Significant time was spent to adjust the input circuit. Finally we decided to use the version of the circuit shown in the schematic. SWR is not ideal one (1: 1.5) but power gain achieved this way is the best. Output signal is fed through low pass filter and then through power/swr probe. SWR measurement is accurate regardless of the output power. PA harbors home made coaxial antenna relay, LNA (MGF1302), power supplies for all control and bias voltages as well as protection circuits. LED indicators show power sequencing at start-up followed by CW sounding ("QRV"). Protection circuit brings PA to permanent receive state if it lacks any of the control/bias voltages. We are thankful to all friends who helped us to complete this project. It had been big and long time effort which at the end proved to be worthwhile. 73 Miška YU7MS
Results:
Cc 2p7
Ct 6p6
Φ 2.5/10, 0.5t, L60
Φ 2.3/29, 7t, L70
2 x Φ 5/30, 11t, L120 Φ 184 x 500 mm
Cptfe 3.4nF
Φ 1.5/12, 31t, L70
Φ 1.5/15, 24t, L70
202 mm
2 x
2n2 2
kV
3/1
0p
2n2 2kV
2x470p 15kV
-
17p 1
0kV
10/25p
6 x 3n3+1n 3kV
+
+
Ia 5A
Ig2 +
/- 2
00m
A
Ug2 1.1kV 0.1AUg1 180-210V 100mA Ua 7kV 4A
Ug2Ug1 Ua
stabilized voltage very hard voltage hard voltage
g2 p
rote
ctio
n if
+U
a f
aile
d
380V~
drive
antGU36B-1
+ Ig1 4
00m
A
Ug1 300V
+Ug2 1600V
+
Ua 10kV+
Uff 12V~
Air Temp 200 C
PWR 20kW SWR
3 x 250V~
01234567
Hour
3 x 60A~
Iff 200A~
8V~
QRO PA GU36B-1
Ua +7kV-Ug1
10E -
200W
-Ug1 +-
+Ua+Ug2
8 x
1N
5408
(7.5 - 8V)
C ptfe 3nF
TX 180V RX 230V
OUT
3x3
n3
6 x Φ 2.7/Fi 30-11t
Φ1.5/12 L70 31t
Φ1.5
/15 L
70 2
4t
Φ2.2/28 L60 11t
+12V
Φ2.5
/Φ10
0.5
t -
L60
C1
C2
G R
R
S
T
auto 40A
auto 40A
auto 40A
13
9
7
16
14
10
8
15
11
5
12
6
68E
68E
68E
R
S
T
D E
F
H Ua 7000V
0
6.3A
6.3A
4A
8V 130A
2x470p 15kV
1n 9
kV
Ug2 1
200V
3n3
-Ug1 -190V
3/10p (5)
10/25p
Ua 7
000V
DRIVE
0.2A
~
~TX +12V
Ug1
250mA
10k
2E2 2W
100E
180E
2n2
270k
100k
2n2
-Ug1
Ur
ANT
Ud Ur
PW
R ins
SW
R ins
24V s
tab
RX out
1 2 3 4 5
6 7 8 9 10
TX +
12V
RX +
12V
470E
470E
1n 3
kV
11 1169V12 1107V13 1046V19 984V14 923V20 861V
22 0
220V 21
1
0 17
2A A
B
C D R Q
P from opto Ua
N Ug2 1200V
11
1216
1513
141
218
17
220V 6
7
0 9
1A
14
1913
1812
1711
16
1 5V st
2 12V st
3 15V st
4 24V st
6 10V
7 18V
8 21V
9 31V
5
10
15
20
A +
18V
B C
D
2k24
7n
1A
1A
1
2
35
46
T
S
R
6.3A
1
2
35
46
92
91
9
10
1
3
2
4
91E5W
68E5W
1k5
1k
10n
1k8
1k
10n
O +31V
17p 3.5kV
0
1
2
35
46
a b
5u
1G2R2G3R3G4R4G5R5G
0. +12V phase det.
1. +12V stab.
4a. +30V from U G2 board
3a. Uff 8V~
3b. Uff GND
U + 30V
L5G
auto
10A
auto
10A
auto
10A
3n3
1n
10u
5u
4x120E 2W
+12V stab
6x3
n3+
6x1
n 3
kV
1n 3
kV
13
9
7
16
14
10
8
15
11
5
12
6
68E
68E
68E
1
3
2
4
13
9
7
16
14
10
8
15
11
5
12
6
68E
68E
68E
1
3
2
4
13
9
7
16
14
10
8
15
11
5
12
6
68E
68E
68E
1
3
2
4
CUaCUa CUa
CUa
4b. to CUa switch
2. -Ug1a
-Ug1a
1R
6G
6R
83000μ
5ZΑ
6ZΑ
+12V
ZV
0.4A
7 8 9 10
11
12
654L3L2L1
6SG6SR
6SO
6SI
S
SWR OFF
7
f
f
ACready
START
START.
SWR SET
3x220V~ 3x3050V~
Ia 5A Ua 10kV
36kWUa
60A
60A
60A
g1
Ig1 400mA
Ug1 300V
R 2
50V~
S 2
50V~
T 2
50V~
LPF
SWR
PWR
Coax RLY
PWRSWR
PWR 20kW SWR
LNA
+31V
+18V
BK
TX
K
+15V
g2
Ig2 +/-200mA Ug2 1600V
low voltages
ON OFF
Ua0 - 1 - 2
Air temp
temp 200 C
GU36-B1
tune load
hour
Ventilator
380V~
AB
Ua
0
R
T
S
R
R
0
R
R
0
R
S
T
t1
3x2.2+2.2+0.8A
phasedetector
A
B
14 13
10 9
6 5
2 1
15 16
11 12
7 8
3 4
R
S
T
R1 0
C R1 out
220V~
380V~
TX RXIff 200A~(4E 4mA)
(4E 4mA)Uff 12V~
12x1N4148
400z
Fi 0.4
2
0.8
W d
is
D
t2
1.1kW 2800 rpm
2100 r
pm
0.8
A
220V~
1.1kW 2800 rpm
t3
43mm H2O
48mm H2O
LED
kontr
ola
1.ON
2.G1
3. ff
4. Ua
5.READY
+12V
h
2100 rpm 0.8At4
braon
crna
plava
0
0
0
0
1
2
3
4
Ua switch
0 1 2
R
S
T
Ua ready
1
23
4
4 1
3 2
CW
193 V~
220V~211V
227V
Φ 0.4 Φ 0.32 3.81 t/V
240V~
208V~
0
13V
17V/11V
phase detector
6s.SWR reset
t2 ON
PHASE
QRO PA GU36B-1
G Rto
geth
er
b1 a
nd b
2 m
ake
76 m
m H
2O
acc
ros
the t
ube
togeth
er
b1 a
nd b
2 m
ake
5200 m
3/h
bla
nk,
and 9
85 m
3/h
acc
ros
the t
ube
1
2
3
4 5
1
2
3
4
5
6
1 C
A
2
3
1 C
A
2
3
1 C
A
2
3
B B B
R S T
HV1 HV2 HV3
20 t
1
2
A
A
B
B
2454V~
2758V~
2900V~
3260V~
5986V=
6727V=
7074V=
7952V=
0
RST ZV U~ U=PRIM SEC
* *
P = 36 kW
Ua transformer
UaRUaSUaT
10E 200W
500E
500E
750E
0.2E
100
W1n
1n
H Ua
3 x ZPY68 (0.2W dis)2x100k (0.4W dis)
F to start UG2
10n
6.3A
TLP627
A A1
E
R S T
R S T
B B1
C1 C
D
1n
B2
330E
1n
GND
3n3n
3n
100k
100k
.1
2 3
4
Ua 10kV
Ia 5A
60 x P600M60 x 1n 3kV
22x100k 5W (1.1W dis)
21 x
100
k 5W
(1.1
W d
is)
22 x 220u 400V
2 x
1N40
07
4 x
1N40
07
3 x
3050
V~
+7450Vpp
204V
60 x 470k 2W (0.3W dis)(338V/el)
1mA 95E 0.095V
19 x
470
k 2W
(0.3
7W d
is)
1mA 95E 0.095V
Ua
4011
3x3W 19V~R
S
T
TLP627
BZ5
4148
470E
10u
10k 10k
BC1771k
A4.7
k4.7
k4.7
k4.7
k
TLP627
BZ5
4148
470E
10u
10k 10k
BC1771k
B
1u
1u
5k6
5k6 1k
1k10k
10k
R1
0
2200u
12V
10u
10k10k
10k
BDX53C
100u
C R1 OUT
4007
4148
D
+12V
4k7
4k7
.11
2 3
4
.21
2 3
4
.
START
12
365
4
89
10
1312
11
12V
2V1V0
gre
en
red
220/16V~ 21V=
4x1N4007
Phase detector
GNDIN OUT
6n8
220u
385
V
-Ug1250mA
10k
2.2E 2W
180Ε
100E
2n2
270k
100k
2n2
6n8
05K
250
(320
/390
V)
1k 1k5
7xBZY93C24
2n2
1N40
07
BC107
10k
10k
2x1N5408
ZX13
3xBZY93C24
1N40
07
2n2
2x1N5408
100k
5W
-Ug1a
RL1
4 x 1N4007
Ug1
300
V
Ig1 400mA
RX 251VTX 185V
4 x 1N4007
296V
37E
1m
A 37
mV
4E 4mA 16mV
+12V stab
TX+12V
220V~ 227V
0
B
A
Ug1~
~
Ug1
8 x
100k
5W
(200
k 40
W)
8x1N
4007
2 x
0.22
E 2
W
1n
100E
1n
470k
470k
470k
500k10
x100
k 2W
8x47
0k
10x4
70u
200V
N250mA
240k
3n3
O +30V4k
7M
JE35
0
10k
2n2P F1 Ua opto F
1N4007A
B
Q
R
C
D
3n3
osc
S
UW
V
2xV
510
K20
560E
200mA
.
Ig2
+/- 2
00m
A35
E +
/- 1m
A 0.
035V
220V~ 21
0 17
20- 861V
22- 0V
Ug2
160
0V1k
7 20
0uA
0.34
V
g2 1200V
320E 90mA
Ug2
12x1
N54
08
from Ug2 A
to Ua B
3n3 3kV
g2 protection if +Ua failed
11
1216
1513
141
218
17
6
9
7
4xS5VB (6A)3x2200u 35V
2200u 50V
5V
12V
15V
24V
1u1u
1u1u
7
9
1 5V
2 12V
3 15V
4 24V
1N4007
1N41
48
6
8
14
19
13
18
12
17
11
16 5101520
10V
17.8V
21.3V
31.5V
8.3V~
13.9V~
16.5V~
24V~
4.5V~
220V~
0
Φ1.4
Φ1.4
Φ1.4
Φ1.4
Φ0.3
Low voltages
GNDIN OUT
GNDIN OUT
GNDIN OUT
GNDIN OUT
29nH 29nH75nH 75nH
24p
30p
24p
Chebyshev LPF, bandwidth 163 MHz, 50 Ohm
1.2mA 574E
1k
470E330Ω
220Ω
750Ω
2n2
560Ω
150Ω
47n
78L12
1u 1u+18V
47n
2k247n
0 - 200 C
0 deg
200 deg
A
B C D
Air temperature
GNDIN OUT
IN
100Ω
100Ω
1N57
11
1N57
11
OUT
Ud
Ur
10n
10n
4n7
4n7
SWR
PWR
PWR SWR
LM324 LM324
10k
2k5
100k
17k
1M
1M
100k 100k
4M7
22n47n
100k
100k
10k 10k
4n7 4n7
100k
Udir Uref
1k
100k 100k
100n
100n
1M
100n
22k
10u
47u
1M
10k
5k6
4n7 4n7
1k
470k
3n2 3n2 3n2
3n2 3n2
4n7
4n7
13
12
14
65 7910
8
2 31
11
4
13
12
14
65 7910
8
2 31
11
4
1mAPWR 20kW
2 x BC107
+24V
12V+24V
+24V
SWR COARSE
SWR
SW
R 1
mA
0V
24V
approx. 100Hz
0V
+24V
approx. 100Hz
0.56v (1.1V max)
+24V
to 6
SI
LED
cont.
PWR SWR
4x12E
4k7
22k
5x1N40075x10n
3xBDX53C3k3
22k
4k7
10k
10n
30V
10u
1u
390E 1
W
15V
1μ
1μ
1n
12V+18V
10n
1μ
1μ
47k
10k
10k
TX +12V
10n
47k
10k 10k
RX +12V
BD140
BD140
BC10710k
10k
BC107
22k
33k 4n7L5Z
BC17710k
470k
4n7
220μ
4.7
u
NE5554k7
100k
4n710u
1N4007
TX RXANT
33E 30V/12V 0.9/0.36A
TX
RX
15V 5
30E
1 2 3 4 5
LNA
+23V
BK
TXIN OUT
K
A
B
C
DE
F G
H
+30V
TX
RX600E 30/12V 50/20mA
I J
L
+15V
6 7 8 9 10
to 7
to 9
to 8
to 4
4. to BK3 (+15V on TX)
5. +30V
6. +18V
7. +15V for LNA
8. and 9. connecting on TX
to LED control 7
0.7Hz
0.7Hz
C RLY step
coax relay TX-RX control
Coax relay TX-RX control
T
T
1
2
3
4
5
6
1
2
3
4 5
GNDIN OUT
GNDIN OUT
T
CV
THR
DIS
V+
R
Q
TR
GND
T
-180V / -250V
to PWR SWRLM224 pin 1
phase det
ON +12V
G1
FF
Ua
SWR
+10V
0. +12V from phase detector
1. +12V stab
1R
2R
2G
10k 1G
1R
1G
10k
4R
4G
4R
4G
4a. +30V from U, G2 board
100k
68k
1u
1n
1n
1n
1n10μ
3R
10k
9 x
BC177
3G
3R
3G
3a. Uff 8V~
3b. Uff GND
100μ
1n
10k
3k3
2xB
C182
100k
100k
555 M
OS
10k 10n
47u
100u
910k
5G
5R
5R
5G
4068
100k
1k
1k
1k
1k
1k
1k
100k
100k
4007
4b. CUa switch
2G
2R
100k
1n
TLP627
2xMJE350
100k
5W
470k
2W
2. -Ug1a
5k
2k2
10k 6G
10k 6R
6R
6G
1k
1k
1k
1k
1k
1n
6ZA
5ZA
4μ7
2x1
N4006
KC
10k
10k
10k
10k
10k
100n
BC107
1μ
3n3
10κ
6SR
6SG
06
06
06
06 06
06
1k
1k
BT149D
150k
1n
10k
1k
1k
10k
1k
1k
BT149D
150k
1n
05
05
05
05
1k
1k
BT149D
150k
1n
02 02
02
02
02
02
1k
1k
BT149D
150k
1n
1k
1k
BT149D
150k
1n
10k
1k
1k
10k
1k
1k
BT149D
150k
1n
10k
1k
1k
10k
04
04
1μ
10κ
S
10κ
BDX54C
01
01
01
01
100k
100k
100k
100k
100k
100k
6SG
6SR
6SI
6SO
08
08
08
08 08
08
LM324
1M22k
1μ1n
22k
4k3
4k5
1μ
BC107
10κ
4n7
10κ
7
10κ
10κ 1μ
+12V
10V
+12V
+12V
G1
ON
Ua
ff
READY
4009
+12V
BC177
+12V
3x1N4007
+12V
Ua ready
10V
10V
10V
10V
+12V
SWR reset
10V
+12V
10V
10V
+12V
+10V
+12V
+12V
+12V
SWRreset
V-
V+
714
2
13
13459
101112
OK11
2 3
4 3 2
54
7 6
9 10 11 12
14 15
V-
V+
816
V+1
123
56
4
8910
12
13
11
3 2 5 4
7 6
9 10
11
12
14 15
V-
V+
816
V+1
4
53
6
12
10
911
8
1312
714
12
3
564
89
10
12
13
11
7 14
9101112131415161
2345678
3 2
5 4
7 6
9 10 11 12
14 15
V-
V+
816
V+1
13
12
14
6 579
108
23 1
11
4
2.5 min
to L5Z coax relay
to SET key
(QRV)
LED control
CV
TH
R
DISV+
RQTRGN
D
T
T
T
CP
D Q
R
S
Q
CP
D Q
R
S
Q
12
34
56
78
O P
E N
+12V
+12V10-26 Hz
speed
+12V
+12V +12V
+12V+12V
+12V
+12V
+12V
+12V from LED control
+12V
"QRV"
"I"
+12V
555
2μ2
100μ
4k7
10k
10n
25k
4017 4017
4013
3
3
3
3
100k
1μ
5ZА
10n
100k
100k
100k
100k
8
8
8
8
4068 100k IRF540
0.1Ω
5W
ZV
4017
1
11
1
6ZА
10n
100k
1μ
buzz
er
100k
100k
1μ
100k
22μ
1N40
07
1 23
56 4
89 10
121311
714
12 3
56 4
89 10
1213 11
714
2
13
13459
101112
V-V
+7
14
12 3
564
8910
1213 11
714
reset
resetreset
start
start
run
QRV CW tone signal
CV
THR
DISV+
RQTRGN
D
V+
O7
O2 GN
D
O5
O1
O0
O6
O3
MR
CP
0
CP
1
O5-
9
O9
O4
O8
V+
O7
O2 GN
D
O5
O1
O0
O6
O3
MR
CP
0
CP
1
O5-
9
O9
O4
O8
V+
GN
D
Q Q
CP C
PR D S
Q Q R D S
V+
O7
O2 GN
D
O5
O1
O0
O6
O3
MR
CP
0
CP
1
O5-
9
O9
O4
O8
Генераторные лампы ГУ-36Б1
Модель: Генераторные лампы ГУ-36Б1
Цена: 60 500 р.
Поверка: 2 800 р.
Наличие: на складе
Генераторные лампы ГУ-36Б1
Генераторные лампы ГУ-365Б1, ГУ-36-1: Мощный генераторный тетрод для работы в качестве генератора колебаний и широкополосного усиления высокой частоты на частотах до 250 МГц в телевизионных передатчиках. Генераторные лампы ГУ-36Б1, ГУ-36Б-1: Оформление - металлостеклянное, с наружным анодом и кольцевыми выводами 2-й сетки и катода. Рабочее положение - вертикальное. Охлаждение - принудительное: анода - воздушное не менее 400 мЧч; ножки - воздушное не менее 100 м/ч; баллона - воздушное не менее 60 мч. Масса 2,5 кг.
Генераторные лампы ГУ-36Б1, ГУ-36Б-1: генераторный тетрод - с оксидным катодом косвенного
накала и воздушным охлаждением анода и ножки.
Для проверки электрических параметров генераторных ламп ГУ-23А, ГУ-36Б-1, ГУ-66А, ГУ-68А, ГУ-88А используют мегаомметр, номиналом не менее 2500 Вольт.
ГУ-36б-1. Масса 11кг.
Обозначение вывода Наименование
А Кольцевой вывод анода
С1 Кольцевой вывод сетки первой
С2 Кольцевой вывод сетки второй
КП Кольцевой вывод катода и подогревателя
П Вывод подогревателя
Лампа ГУ-36Б1 содержит:
палладий – 163,02 мг;
золото – 753,01 мг;
платина – 4,75 мг;
серебро – 2125,2 мг.
Основные параметры
при Uн=8,3 В, Uа=2 кВ, Uc2=750 В, Iа=4 А
Ток накала 120 ± 5 А
Напряжение 1-й сетки отрицательное (при Uа=7 кВ, Uс2=1,2 кВ, Iа=0,3 А)
£ 220 В
Ток эмиссии катода (при Uа=400 В) ³30 А
Ток анода (при Uc1=0) ³ 4 А
Крутизна характеристики 83 ± 13 мА/В
(85 ± 10 для ГУ-36Б)
Коэффициент усиления 1-й сетки относительно 2-й сетки (при Uс2=500 и 750
В) 10 ± 3
Колебательная мощность (на частоте 250 МГц и полосе 8 МГц) ³ 10 кВт
Междуэлектродные емкости, пФ:
входная 150
выходная £24 (23 для ГУ-36Б)
проходная 0,6
Долговечность ³ 2000 (1000 для ГУ36Б) ч
Предельные эксплуатационные данные
Напряжение накала на частотах до 50 МГц 8,3 В
Напряжение накала на частотах свыше 50 МГц 8 В
Ток накала пусковой 210 А
Напряжение анода на частотах 100 - 250 МГц 7 кВ
Напряжение анода на частотах до 100 МГц 8 кВ
Напряжение 2-й сетки 1,1 к В (1,25 для ГУ-36Б)
Напряжение 1-й сетки отрицательное 400 В
Мощность, рассеиваемая анодом 15 кВт (14 для ГУ-36Б)
Мощность, рассеиваемая 2-й сеткой 300 Вт
Мощность, рассеиваемая 1-й сеткой 150 Вт
Рабочая частота 250 МГц
Температура анода 250 С
Температура ножки и спаев керамики с металлом 175 С
Рабочая температура окружающей среды до 60 С
LY1DQ ham radio resources [email protected]
Created by LY3NML
at up to 50 MHz 8.3 at above 50 MHz 8.0
Filament starting current, A 210
Anode voltage (DC), kV: at up to 100 MHz 8 at 100-250 MHz 7 Grid 2 voltage (DC), V 1100
anode 15.103
grid 1 150
grid 2 300
Operating frequency, MHz 250
Temperature, °C: anode 250
TETRODE GU-36B-1
The GU-36B-1 power tetrode is used for wide-band power amplification at frequencies up to 250 MHz in
stationary general-purpose RF equipment.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic with ring leads.
Cooling: forced air.
Height: at most 300 mm.
Diameter: at most 184 mm.
Mass: at most 11 kg.
OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C -10 to +55
Relative humidity at up to +25 °C, % 98
BASIC DATA Electrical Parameters
Filament voltage (AC or DC), V 8.3
Filament current, A 110-130
Mutual conductance (at anode voltage 2 kV,
grid 2 voltage 750 V, anode currents 4 and 6 A), mA/V, at least 70-96
Gain coefficient (at anode voltage 2 kV, grid 2 voltages
750 and 500 V, anode current 4 A) 7-13
Anode current (at anode voltage 2 kV, grid 2
voltage 9000 V) A, at least 5
Negative cutoff voltage (at anode voltage 7 kV, grid 2
voltage 1200 V, anode current 0.3 A), absolute value, V, at most 220
Interelectrode capacitance, pF:
input, at most 155
output, at most 24
transfer, at most 0.8
Output power (at frequencies up to 250 MHz, anode voltage
at least 6 kV, grid 2 voltage 900 V, bandwidth 8 MHz), kW, at least 10
Limit Operating Values
Filament voltage (AC or DC), V:
CONNECTION OF
ELECTRODES WITH LEADS
Negative grid 1 voltage (instantaneous value), absolute value, V 400
Dissipation, W:
stem and ceramic-to-metal seals 175
LY1DQ ham radio resources [email protected]
Created by LY3NML
Averaged Anode-Grid Characteristic Curves:
U1 = 8.3 V, Ug2 = 1.2 kV
Averaged Grid 1 Characteristic Curves:
U1 = 8.3 V, Ug2 = 1.2 kV
Averaged Grid 2 Characteristic Curves:
U1 = 8.3 V, Ug2 = 1.2 kV