Data set 01
1962 Eimac
Published operating points and test conditions from this source.
Beam Power
Other
The EIMAC
500 a
The EIMAC 4CX7500A is a compact ceramic/metal radial beam power tetrode intended for use in VHF power amplifier applications. It features a type of
internal mechanical structure which results in high rf operating efficiency. Low rf losses
220 MHz
internal mechanical structure which results in high rf operating efficiency. Low rf losses in this structure permit operation at full ratings to 220 MHz. A dense
The
20 a
The 4CX7500A has a gain of over 20 dB in FM broadcast service, and is also recommended for rf linear power amplifier service and for VHF-TV linear
amplifier service. The anode is rated for
7500 watts
amplifier service. The anode is rated for 7500 watts of dissipation with forced air cooling.
CuIment, At
110 A
CuIment, At 7.0 VOIS ..\ oottt e e e e e e 110 A
N oo
74.1 pF
N oo 74.1 pF
GOt .o e e
206 pF
GOt .o e e 206 pF
Maximum Frequency for Full Ratings (CW) . ... ... .. i e e
220 MHz
Maximum Frequency for Full Ratings (CW) . ... ... .. i e e 220 MHz
*Capacitance values are for a cold tube as measured in a special shielded fixture in accor
191 a
*Capacitance values are for a cold tube as measured in a special shielded fixture in accordance with Electronic Industries Association Standard RS-191.
Maximum Operating Temperature, Ceramic/Meta! Seals & Anode Core
250 °C
Maximum Operating Temperature, Ceramic/Meta! Seals & Anode Core .................................................... 250°C
Available Screen Grid Bypass Capacitor Kit for SK
355 pF
Available Screen Grid Bypass Capacitor Kit for SK-350 or SK-360 (8000 pF @ S000DCWV) . ...... ..o iiiiiiiiiiinnnnn.. EIMAC SK-355
Class C Telegraphy or FM (Measured data in EIMAC CV
100.5 MHz
Class C Telegraphy or FM (Measured data in EIMAC CV2228 FM cavity at 100.5 MHz)
DCPLATEVOLTAGE . ...............vte
24 VOLTS
DCPLATEVOLTAGE . ...............vte 7500 VOLTS Plate Current ............... 2.1 22 24 Adc
DCSCREENVOLTAGE
140 VOLTS
DCSCREENVOLTAGE ................... 1500 VOLTS ScreenCurrent . ............ 195 128 140 mAdc
DCGRIDVOLTAGE .............covivenn
95 VOLTS
DCGRIDVOLTAGE .............covivenn 500 VOLTS GridCurrent ............... 185 90 95 mAdc
DCPLATECURRENT ................cco..e
130 AMPERES
DCPLATECURRENT ................cco..e. 3.0 AMPERES Driving Power . ............. 247 100 130 w
PLATE DISSIPATION
77 WATTS
PLATE DISSIPATION ..................... 7500 WATTS Efficiency ................. 79.3 776 77.0 %
SCREEN DISSIPATION
121 WATTS
SCREEN DISSIPATION .................... 165 WATTS Useful Output Power . ........ 10.8 1.1 121 kW
GRIDDISSIPATION .............ciiennn
19.7 WATTS
GRIDDISSIPATION .............ciiennn. 50 WATTS Power Gain ................ 16 20 19.7 dB
Class AB
30 MHz
Class AB1 Conditions (frequencies below 30 MHz)
DCPLATEVOLTAGE
22 VOLTS
DCPLATEVOLTAGE ..................... 7500 VOLTS Max. Signal Plate Current .................... 22 Adc
DCSCREENVOLTAGE
1250 VOLTS
DCSCREENVOLTAGE ................... 1500 VOLTS ScreenVoltage . ........... ...l 1250 Vde
DCGRIDVOLTAGE . .................o..t
500 VOLTS
DCGRIDVOLTAGE . .................o..t -500 VOLTS Screen Current . ... ... g5 mAdc
DCPLATECURRENT
190 AMPERES
DCPLATECURRENT ...................... 3.0 AMPERES Grid Bias Voltage™ ........................ -190 Vde
PLATE DISSIPATION
0 WATTS
PLATE DISSIPATION . .................... 7500 WATTS Grid Current’ . ........ ... 0 mAdc
SCREEN DISSIPATION
10 WATTS
SCREEN DISSIPATION . ................... 165 WATTS Useful Power Out™ . ....................... 10 KW
GRID DISSIPATION ............ ...t
0 WATTS
GRID DISSIPATION ............ ...t 50 WATTS Driving Power ............o i 0 W
* Approximate Value
32 dB
* Approximate Value 3rdOrderProducts . ..............c.ov... -32 dB
» Adjust to specified zero-signal plate current SthOrderProducts
44 dB
» Adjust to specified zero-signal plate current SthOrderProducts ...................... -44 dB
and SK
350 Watts
and SK-350 are designed especially for the concentric base terminals of Watts CFM In. Water
selected in a given application must be capable of supplying the desired
1.8 a
selected in a given application must be capable of supplying the desired 5000 280 1.8
air flow at a back pressure sufficient for the tube, plus any drop caused
79 a
air flow at a back pressure sufficient for the tube, plus any drop caused 7500 592 79
Inlet Air Temperature =
25 °C
Inlet Air Temperature = 25°C Watts CEM In. Water
Watts CEM In. Water With operation at plate dissipation below
5 Watts
Watts CEM In. Water With operation at plate dissipation below 5.0 kW and lower air flow
Watts CFM in. Water Application Bulletin #
20 Watts
Watts CFM in. Water Application Bulletin #20 titled TEMPERATURE MEASUREMENTS WITH
Inlet Air Temperature =
35 °C
Inlet Air Temperature = 35°C filters, rf seal heating, and dirty anode cooling fins if the tube has been
rechecked after
300 MHz
rechecked after 24 hours. Filament voltage should be closely regulated is dependent on frequency. Under 300 MHz most of the energy will pass
GRID OPERATION - The maximum control grid dissipation is
50 watts
GRID OPERATION - The maximum control grid dissipation is 50 watts, INTERELECTRODE CAPACITANCE - The actual internal interelectrode
connected tube. A series regulated power supply can be used only when Grid & X-Ray Tube Pr
301 A
connected tube. A series regulated power supply can be used only when Grid & X-Ray Tube Products, Attn: Product Manager; 301 Industrial Way;
an adequate bleeder resistor is provided. San Carlos, CA
94070 A
an adequate bleeder resistor is provided. San Carlos, CA 94070 U.S.A.
SCREEN VOLTAGE =
500 VOLTS
SCREEN VOLTAGE = 500 VOLTS
SCREEN VOLTAGE =
650 VOLTS
SCREEN VOLTAGE =650 VOLTS
T LSRRIR IR IR afanst B
11 A
T LSRRIR IR IR afanst B 11 B oR A cE D
v e e ee I
19 A
v e e ee I 19 SR SR A — > N s