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R1
R2
R2
R2
R2
R2
C1
R1
R1
R1
R1
R1
R1
R1
C1
C1
C1
C1
R1
R3
R4
C2
C3
G2
G1
CATHODE
HEATER
SUPPLY
RESERVOIR
HEATER
SUPPLY
(VARIABLE)
GRID 2 DELAYED
WITH RESPECT TO GRID 1
GRID 2 VOLTAGE
500 – 2000 V,
1
ms
0
NEGATIVE BIAS VOLTAGE
GRID 0/GRID 1 CURRENT
0.5 – 1.5 A,
2
ms
0.5
msMIN
GRID 1/GRID 2 DELAY
7251
CATHODE (
7)
ANODE (+)
SCHEMATIC DIAGRAM (Modulator Service)
R1
=
470
O 12 W vitreous enamelled wirewound resistors.
R2
=
5 to 20 M
O high voltage resistors with a power rating consistent with forward anode voltage.
R3
=
Grid 2 series resistor. 12 W vitreous enamelled wirewound is recommended, of an impedance to match the grid 2 drive
pulse circuit.
R4
=
Grid 1 series resistor. 12 W vitreous enamelled wirewound is recommended, of an impedance to match the grid 1 drive
pulse circuit.
C1
=
500 pF capacitors with a voltage rating equal to the peak forward voltage. These capacitors may be required to
balance the voltages across each gap if the anode voltage rises in less than 5 ms.
C2,C3 =
Reservoir protection capacitors with a voltage rating
5500 V;
C2 =
1000 pF low inductance (e.g. ceramic),
C3 =1 mF (e.g. polycarbonate or polypropylene).
Components R3,R4,C2, and C3 should be mounted as close to the tube as possible.
#
E2V Technologies
CX1594, page 5
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