Data set 01
1962 Eimac
Published operating points and test conditions from this source.
Tetrode
Other
The EIMAC
0 a
The EIMAC 4CX300Y is a compact integral-finned external-anode
power tetrode having a maximum plate-dissipation rating of
400 a
power tetrode having a maximum plate-dissipation rating of 400 watts.
The
110 MHz
The 4CX300Y may be operated at maximum ratings to 110 MHz.
Current (E;=
3.85 volts
Current (E;=6.0 volts) - - - 3.0 3.85 A
Transconductance (
12000 ma
Transconductance (1,=200 ma.) - - 12,000 umhos
Input R T T S
38 pF
Input R T T S 30 38 pF
Output - - - - - - - - =
5 pF
Output - - - - - - - - = - - - - 3.9 5.0 pF
Feedback - T R S
0.07 pF
Feedback - T R S 0.07 pF
Input
18 pF
Input - - - - - - - - - - - - - 18 pF
Output
5 pF
Output - - - - - - - - - - - - - 3.9 5.0 pF
Feedback T
0.01 pF
Feedback T 0.01 pF
Frequency for Maximum Ratings
110 MHz
Frequency for Maximum Ratings - - - - - - - - 110 MHz
Ceramic-to-Metal Seals - - - - - - - « - <
250 °C
Ceramic-to-Metal Seals - - - - - - - « - < - - - - 250°C
Anode Core - - - - = = =
950 °C
Anode Core - - - - = = = - - 4 - - - - - - . 950°C
(Revised
1968 A
(Revised 6-15-66) © 1962, 1966, 1968 by Varian Printed in U.S.A.
OR OSCILLATOR DC Plate Voltage
1500 volts
OR OSCILLATOR DC Plate Voltage - - - - 1000 1500 volts
Class-C Telegraphy or FM Telephony DC Screen Voltage
250 volts
Class-C Telegraphy or FM Telephony DC Screen Voltage - - - - 250 250 volts
(Key-down condifions) DC Grid Voltage - - - - =
90 volts
(Key-down condifions) DC Grid Voltage - - - - =9 —90 volts
IN DC Plate Current
0.4 amps
IN DC Plate Current - - . - 038 0.4 amps
DC PLATE VOLTAGE
26 VOLTS
DC PLATE VOLTAGE - - - 2000 VOLTS DC Screen Current* - - - - 31 26 mA
DC SCREEN VOLTAGE
33 VOLTS
DC SCREEN VOLTAGE - - - 300 VOLTS DC Grid Current* .- - - - 32 33 mA
DC GRID VOLTAGE - - - —
110 VOLTS
DC GRID VOLTAGE - - - —250 VOLTS Peak RF Grid Voltage* - - - 110 110 ‘volts
DC PLATE CURRENT
3.8 MA
DC PLATE CURRENT - - - 400 MA Driving Power* - - - - . 3.5 3.8 watts
PLATE DISSIPATION
600 WATTS
PLATE DISSIPATION - - - 400 WATTS Plate input Power - - - - 380 600 watts
SCREEN DISSIPATION
425 WATTS
SCREEN DISSIPATION - - - 8 WATTS Plate Output Power - - - - 240 425 watts
GRID DISSIPATION
1 WATT
GRID DISSIPATION - - - 1 WATT *Approximate values
DC Plate Voltage
2000 volts
DC Plate Voltage - - - - 1000 1500 2000 volts
MODULATOR DC Screen Voltage
400 volts
MODULATOR DC Screen Voltage - - - - 400 400 400 volts
Class-ABy ?C Gsrid Vlog%gg'l corront &
70 volts
Class-ABy ?C Gsrid Vlog%gg'l corront & :88 —270 —70 volts
ero-Signa ate Current
200 mA
ero-Signa ate Current - - 00 200 mA
MAXIMUM RATINGS (per tube) Max-gjgnall BC SP|ate Current
750 mA
MAXIMUM RATINGS (per tube) Max-gjgnall BC SP|ate Current - - 800 790 750 mA
DC PLATE VOLTAGE _ _
4 VOLTS
DC PLATE VOLTAGE _ _ . 2000 VOLTS ax-Signa C Screen Current - - 24 16 4 mA
DC SCREEN VOLTAGE
5100 VOLTS
DC SCREEN VOLTAGE - - - 400 VOLTS Peak AF Grid Input Voltage 060 3000 5100 ohms
DC PLATE CURRENT
60 MA
DC PLATE CURRENT - - - 400 MA b (per h;be)' - - e e 55 65 60 volts
PLATE DISSIPATION
0 WATTS
PLATE DISSIPATION - - - 400 WATTS riving Power - - - - - 0 0 0 watts
SCREEN DISSIPATION
890 WATTS
SCREEN DISSIPATION - - - 8 WATTS Q::):;fi:nga?ea!’alrulite Output Power - 340 800 890 watts
GRID DISSIPATION
1 WATT
GRID DISSIPATION - - - 1 WATT lAdJPust grid bias to obtain listed zero-signal plate current.
ri oltage - - - D —
70 volts
ri oltage - - - D —70 —70 volts
MAXIMUM RATINGS Zero-Signal DC Plate Current
100 mA
MAXIMUM RATINGS Zero-Signal DC Plate Current - - 200 100 100 mA
DC PLATE VOLTAGE
205 VOLTS
DC PLATE VOLTAGE - - - 2000 VOLTS DC Plate Current - - - - 280 210 205 mA
DC SCREEN VOLTAGE
5 VOLTS
DC SCREEN VOLTAGE - - - 400 VOLTS DC Screen Current* - - - - -5 -5 —5 mA
DC PLATE CURRENT
30 MA
DC PLATE CURRENT - - - 400 MA Peak RF Grid Voltage* - - - 28 33 30 volts
PLATE DISSIPATION
115 WATTS
PLATE DISSIPATION - - - 400 WATTS Plate Output Power - - - - 52 110 115 watts
SCREEN DISSIPATION
8 WATTS
SCREEN DISSIPATION - - - 8 WATTS *Approximate values.
GRID DISSIPATION
1 WATT
GRID DISSIPATION - - - 1 WATT 1Adjust grid bias to obtain listed zero-signal plate current.
RADIO-FREQUENCY LINEAR AMPLIFIER DC Plate Voltage
2000 volts
RADIO-FREQUENCY LINEAR AMPLIFIER DC Plate Voltage - - - - 1000 1500 2000 volts
Class-AB; (Single-Sideband Suppressed-Carrier DC Screen Voltage
400 volts
Class-AB; (Single-Sideband Suppressed-Carrier DC Screen Voltage - - - - 400 400 400 volts
Operation) DC Grid Voltagel
70 volts
Operation) DC Grid Voltagel - - - . 60 -—-70 —70 volts
Zero-Signal DC Plate Current
100 mA
Zero-Signal DC Plate Current - - 200 100 100 mA
MAXIMUM RATINGS E%a';IRF %id Voltage*
392 a
MAXIMUM RATINGS E%a';IRF %id Voltage* - - - 488 332 392 voAts
DC PLATE VOLTAGE
2 VOLTS
DC PLATE VOLTAGE - - - 2000 VOLTS DC Screen Current* - - - - 12 8 2 mA
DC SCREEN VOLTAGE
750 VOLTS
DC SCREEN VOLTAGE - - - 400 VOLTS Plate Input Power - - - - 400 590 750 watts
DC PLATE CURRENT
415 MA
DC PLATE CURRENT - - - 400 MA Plate QOutput Power - - - - 170 400 415 watts
PLATE DISSIPATION
400 WATTS
PLATE DISSIPATION - - - 400 WATTS Two-Tone Average DC Plate Current
SCREEN DISSIPATION
8 WATTS
SCREEN DISSIPATION - - - 8 WATTS T e faverage DC Screen Current
GRID DISSIPATION
1 WATT
GRID DISSIPATION - - - 1 WATT 1Adjust grid bias to obtain listed zero-signal plate current.
Tl
130 volts
- - -Tl- 1300 —130 , volts
AXIMUM_RATING DC Plate Current
300 mA
AXIMUM_RATING DC Plate Current - - - - - 285 300 mA
DC SCREEN VOLTAGE
17 VOLTS
DC SCREEN VOLTAGE - - - 300 VOLTS DC Grid Current* . . 17 17 mA
DC GRID VOLTAGE - - - —
148 VOLTS
DC GRID VOLTAGE - - - —250 VOLTS Peak RF Grid Input Voltage* - - - 148 148 volts
DC PLATE CURRENT
1.7 MA
DC PLATE CURRENT - - - 300 MA Driving Power* - - - - . - 1.7 1.7 watts
PLATE DISSIPATION
500 WATTS
PLATE DISSIPATION - - - 250 WATTS plate input Power - - - - - 285 500 wafts
SCREEN DISSIPATION
300 WATTS
SCREEN DISSIPATION - - - 8 WATTS Plate Output Power - - - - - 165 300 watts
GRID DISSIPATION
1 WATT
GRID DISSIPATION - - - 1 WATT *Approximate values. .
pF. The SK
606 pF
pF. The SK-606 chimney is recommended for power should be kept near the values shown in
include the SK
770 A
include the SK-740, SK-760, and SK-770. These In class-A and class AB; amplifiers, where no
pacitors. The SK
770 a
pacitors. The SK-760 and SK-770 incorporate applied through a resistor. The maximum per-
installed in the usual manner. screen dissipation for the
8 watts
installed in the usual manner. screen dissipation for the 4CX300Y is 8 watts.
metal seal temperature for the
300 volts
metal seal temperature for the 4CX300Y is 300 volts when the tube is operated in class-C
ments to maintain seal temperatures at
200 °C
ments to maintain seal temperatures at 200°C Under certain operating conditions the screen
in
50 °C
in 50°C ambient air are tabulated below. current of a tetrode may reverse. This makes it
Plate SEA LEVEL
10000 a
Plate SEA LEVEL 10,000 FEET or a series regulator to supply the screen voltage
ot | NGRS | OGP | AR |
0 a
ot | NGRS | OGP | AR | 0Pk unless a bleeder or regulator tube is connected
for the
6 volts
for the 4CX300Y is 6.0 volts.
The heater voltage must be maintained within Plate Operation—The
0 a
The heater voltage must be maintained within Plate Operation—The 4CX300Y has a finned
for the
400 watts
for the 4CX300Y is 400 watts, which is also the efficiency is low.
watts under carrier conditions, rising to
400 watts
watts under carrier conditions, rising to 400 the plate supply voltage. Screen voltage modu-
watts under
1 watts
watts under 100% sine-wave modulation. Plate lation factors between 0.75 and 1.00 may be used.
AB; operation is
2000 volts
AB; operation is 2000 volts. In class-C tele- scribed under “Screen Operation” above.
mum rated plate voltage is
1500 volts
mum rated plate voltage is 2000 and 1500 volts Special Applications—If it is desired to oper-
SCREEN VOLTAGE—
250 VOLTS
SCREEN VOLTAGE—250 VOLTS
SCREEN VOLTAGE —
400 VOLTS
SCREEN VOLTAGE —400 VOLTS