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Eimac

3-500Z

HIGH MU POWER TRIODE


The Elmac 3-500Z is a compact power triode intended to be used as a zero-bias Class AB2 amplifier in audio or radio-frequency applications. Operation with zero grid bias simplifies associated circuitry by eliminating the bias supply. In addition, grounded-grid operation is attractive since power gain as high as twenty times can be obtained with the 3-500Z in a cathode-driven circuit.

From brochure by Eimac, Effective 9/15/91.
Varian
power grid & x-ray tube products
1678 South Pioneer Road / Salt Lake City, Utah 84104 / U.S.A. / (801) 972-5000

GENERAL CHARACTERISTICS

Characteristics and operating values are based upon performance tests. These figures may change without notice as the result of additional data or product refinement. Varian Power Grid & X-Ray Tube Products should be consulted before using this information for final equipment design.

ELECTRICAL

Filament: Thoriated Tungsten
Voltage 5.0 +/- 0.25 Volts
Current @ 5.0 Volts 14.6 Amperes
Amplification Factor(Average)130
Direct lnterelectrode Capacitance (Grounded Filament)2
Cin8.3 pF
Cout0.07pF
Cgp4.7 pF
Direct lnterelectrode Capacitance (Grounded Circuit)2
Cin8.3 pF
Cout4.7 pF
Cgp0.07pF
Frequency of Maximum Rating(CW)110 MHz

2 Capacitance values are for a cold tube as measured in a special shielded fixture

Maximum Overall Dimensions:
Length6.10 in; 154.94 mm
Diameter3.44 in; 87.33 mm
NetWeight7oz; 198.5 gm
Operating PositionVertical, base up or down
Maximum Operating Temperature:
Plate Seals225 C
Base Seals200 C
CoolingRadiation and ForcedAir
Base5 Pin Special
Recommended SocketVarian SK-410
Recommended ChimneyVarianSK-406
Recommended Heat-Dissipating Connector:
PlateHR-6

RADIO FREQUENCY LINEAR AMPLIFIER

CATHODE DRIVEN

(Frequencies to 110 MHz)
Class AB2

MAXIMUM RATINGS:
DC PLATE VOLTAGE4 000 VOLTS
DC PLATECURRENT0.4 AMPERE
PLATE DISSIPATION500 WATTS
GRID DISSIPATION20 WATTS

  1. Zener diode positive bias used at plate potentials of 3 kV and above
  2. Approximate value
  3. Currents listed correspond to SSB, or "Two-tone" average current at peak of signal envelope
  4. Single-tone current for 3500 Vdc operation may reach this value during short periods of circuit adjustment only
  5. Intermodulation distortion products are referenced against one tone of a two tone signal

TYPICAL OPERATION
Class AB2, Peak Envelope or Modulation Crest Conditions

PlateVoltage15002000250030003500Vdc
Cathode Voltage1000+10+15Vdc
Zero Signal Plate Current265951306253mAdc
Single-Tone Plate Current, CW3 4400400400400400mAdc
Two-Tone PIate Current260270280268262mAdc
Single-Tone Grid Current2130130120108108mAdc
Two-Tone Grid Current28080706058mAdc
Single-Tone Power Input600800100012001400W
Useful Output Power CW or PEP330500600740890W
Resonant Load Impedance16002750345042005000
Intermodulation Distortion Products5
3rd Order-46-38-33-40-40db
5th Order----46-45db
Driving Impedance94102100115115
Maximum Signal Driving Power24949464646W

RADIO FREQUENCY POWER AMPLIFIER OR OSCILLATOR

GRID DRIVEN, CATHODE DRIVEN

Class AB2 and C Telegraphy or FM
(Key-Down Conditions)

(Frequencies to 110 MHz)

MAXIMUM RATINGS:
DC PLATE VOLTAGE4 000 VOLTS
DC PLATECURRENT0.35 AMPERE
PLATE DISSIPATION500 WATTS
GRID DISSIPATION20 WATTS

TYPICAL OPERATION
Grid DrivenCathode Driven
PIateVoltage3000350030003500Vdc
Grid Voltage-10-75-10-75Vdc
Plate Current350300333350mAdc
Grid Current115115108118mAdc
Peak rf (Cathode) (Grid)Voltage11018795200V
Approximate Driving Power14223581W
Plate Input Power1050105010001225W
Plate Dissipation330200300305W
Useful Output Power720850700920W
Resonant Load Impedance4200570048005500ohms

PLATE MODULATED RADIO FREQUENCY POWER AMPLIFIER

GRID DRIVEN

Class C Telephony (Carrier Conditions)

MAXIMUM RATINGS:
DC PLATE VOLTAGE3 000 VOLTS
DC PLATECURRENT0.275 AMPERE
PLATE DISSIPATION1330 WATTS
GRID DISSIPATION220 WATTS

  1. Corresponds to 500 watts at 1 000/0 sine-wave modulation
  2. Average, with or without modulation

TYPICAL OPERATION
(Frequencies to 30 MHz)
Plate Voltage3 000 Vdc
Grid Voltage-100 Vdc
Plate Current275 mAdc
Grid Current1120 mAdc
Peak rf Grid Voltage1200 v
Calculated Driving Power25 W
Plate Input Power825 W
Plate Dissipation185 W
Plate Output Power640 W

  1. Approximate value

AUDIO FREQUENCY POWER AMPLIFIER OR MODULATOR

Class AB2, Grid Driven (Sinusoidal Wave)

MAXIMUM RATINGS (Per Tube):
DC PLATE VOLTAGE14000 VOLTS
DC PLATE CURRENT0.4 AMPERE
PLATE DISSIPATION500 WATTS
GRID DISSIPATION20 WATTS

TYPICAL OPERATION (Two Tubes)
PlateVoltage3000 Vdc
Grid Voltage0 Vdc
Zero-Signal Plate Current2300 mAdc
Maximum Signal Plate Current770 mAdc
Max Signal Grid Current2244 mAdc
Peak af Grid Voltage3100 V
Peak Driving Power425 W
Plate Input Power2310 W
Maximum Signal Plate Dissipation890 W
Plate Output Power1420 W
Load Resistance(plate to plate)8600 ohms

  1. See zero-bias operation in Application Section
  2. Approximate value
  3. Per tube
  4. Nominal drive power is one-half peak power

HIGH-LEVEL MODULATED RADIO FREQUENCY AMPLIFIER

PULSE-WIDTH MODULATION - GRID DRIVEN

ABSOLUTE MAXIMUM RATINGS:
RF
Amplifier
Switching
Modulator
DC Plate Voltage410KILOVOLTS
DC Plate Current0.40.4AMPERES
DC Grid Voltage-200-200VOLTS
Plate Dissipation500500WATTS
Grid Dissipation2020WATTS


TYPICAL OPERATION (Carrier Conditions)

RF
Amplifier

Switching
Modulator
Plate Voltage3.09.0kVdc
Plate Current250180mAdc
Grid Voltage-85-120Vdc
Grid Current2170125mAdc
Useful PowerOutput25501500W

  1. These conditions assume rectangular drive waveform and a third harmonic, high-efficiency "Tyler" circuit
  2. Approximate value
NOTE:TYPICAL OPERATION data are obtained by calculation from published characteristic curves or actual measurement. Adjustment of the rf grid voltage to obtain the specified plate current at the specified bias and plate voltages is assumed. If this procedure is followed, there will be little variation in output power when the tube is changed, even though there may be some variation in grid current. The grid current which results when the desired plate current is obtained is incidental and varies from tube to tube. These current variations cause no difficulty so long as the circuit maintains the correct voltage in the presence of the variations in current. If grid bias is obtained principally by means of a grid resistor, the resistor must be adjustable to obtain the required bias voltage when the correct rf grid voltage is applied.

RANGE VALUES FOR EQUIPMENT DESIGN

MinMax
Filament: Current at 5.0 Volts13.815.0Amperes
Interelectrode Capacitance1 (Grounded Filament Connection)
Input6.510.0pF
Output-0.18pF
Feedback4.25.2pF
Interelectrode Capacitance1 (Grounded Grid Connection)
Input6.510.5pF
Output4.25.2pF
Feedback-0.18pF
Zero Signal Plate Current:
(Ec=0Vdc Eb=Vdc)90180mAdc

1In shielded fixture

APPLICATION

MECHANICAL

MOUNTING - The 3-500Z must be operated vertically, base up or down. A flexible connecting strap should be provided between the heat dissipating plate connector and the external plate circuit. The tube must be protected from severe vibration and shock.

SOCKET - The EIMAC SK-410 air system socket and the SK-406 chimney are recommended for use with the 3-500Z. When a socket other than the SK-410 is used, provisions must be made for equivalent cooling of the base, the envelope, and the plate lead.

If a socket other than the EIMAC SK-410 Is employed, the user should assure himself that strong lateral pressure is not applied to the tube base pins. Otherwise, even though the base of the tube is reinforced, damage to the base seals may result.

CAUTION-GLASS IMPLOSION - The EIMAC 3-500Z is pumped to a very high vacuum, which is contained by a glass envelope. When handling a glass tube, remember that glass is a relatively fragile material, and accidental breakage can result at any time. Breakage will result in in flying glass fragements, so safety glasses, heavy clothing, and leather gloves are recommended for protection.

COOLING - Forced-air cooling is required to maintain the base seals at a temperature below 200 C. Air flow requirements to maintain the above maximum temperatures are tabulated below (For operation below 30 MHz).

Base-to-Anode Air Flow
Anode
Dissipation
(Watts)
Air
Flow
(CFM)
Preassure
Drop
(inches-H2O)
3006.60.023
40010.30.052
50013.00.082

The anode of the 3-5002 operates at a visibly red color at its maximum rated dissipation of 500 Watts.

In all cases, air flow rates in excess of the minimum requirements will prolong tube life. NOTE: Two 3-500Z tubes in a single amplifier, chassis mounted, may be adequately cooled by use of a fan so mounted as to pressurize the space below the sockets. Fans suitable for use at or near sea level are Pamotor Model 2000, or Model 6500. The Rotron "Spartan" fan (3200 rpm) is also suitable, as is a #3, 3 inch squirrel cage blower (31 00 rpm) all cases, the only criteria of proper cooling is the temperature of the tube seals Tube temperatures may be measured with the aid of temperature sensitive paint, spray or crayon.

Suitable products are manufactured by the Tempil Division, Big Three lndustrial Gas & Equipment Co., Hamilton Blvd., So Plainfield, New Jersey 07080.

ELECTRICAL

FILAMENT OPERATION - The rated filament voltage for the 3-500Z is 5.0 volts. Filament voltage, as measured at the socket, should be maintained within the range of 4.75 to 5.25 volts to obtain maximum tube life.

For best tube life, the inrush current to the filament should be limited to two times normal current during turn-on. This will minimize thermal stress on the thoriated-tungsten filament wire, which can cause internal tube geometry changes with repeated cycling.

HIGH VOLTAGE - Operating voltage for this tube can be deadly, so the equipment must be designed properly and operating precautions must be followed. Design equipment so that no one can come in contact with high voltages. All equipment must include safety enclosures for high voltage circuits and terminals, with interlock switches to open the primary circuits of the power supply and to discharge high voltage capacitors whenever access doors are opened. Interlock switches must not be bypassed or "cheated" to allow operation with access doors open. Always remember that HIGH VOLTAGE CAN KILL.

INTERMODULATION DISTORTION - Typical operating conditions with distortion values included are the result of data taken during actual operation at 2 MHz. Intermodulation values listed are those measured at the full peak envelope power noted

INPUT CIRCUIT - When the 3-500Z is operated as a grounded-grid rf amplifier the use of a resonant tank in the cathode circuit is recommended in order to obtain greatest linearity and power output. For best results with a single-ended amplifier it is suggested that the cathode tank circuit operate at a Q of two or more.

SPECIAL APPLICATIONS - If it is desired to operate this tube under conditions different from those given here, write to the Power Grid Tube Marketing Department, Varian, 1678 South Pioneer Road, Salt Lake City, Utah 84104, telephone (801) 972-5000, for information and recommendations.

Tube dimentions

Socket dimentions

DIMENSIONAL DATA
 INCHESMM
DIM.MIN.MAX.REF.MIN.MAX.REF.
A 3.438  87.33 
B.350.365 8.899.27 
C.328.359 8.339.12 
D 5.200  132.1 
E5.5006.100 139.7154.94 
F.700  17.78  
G      
H      
I      
J 2.500  63.5 
K  30    
L.185.191 4.74.85 
M  1.250  31.75
NOTES

  1. REF DIMENSIONS ARE FOR INFO ONLY & ARE NOT REQUIRED FOR INSPECTION PURPOSES
  2. METRIC EQUIVILENTS TO TME NEAREST 0.01mm, ARE GIVEN FOR GENERAL INFO ONLY & ARE BASED ON 1 INCH = 25.4 mm.
  3. ONLY BASE PINS "L" ARE SO ALIGNED THAT THEY CAN BE FREELY INSERTED INTO A GAGE 1/4" THK. WITH HOLE DIAS. OF .204 LOCATED ON TRUE CENTERS BY THE GIVEN DIMS. "K" & "M".


ALL CREDIT TO THE USEFULNESS OF THIS (Formatting, data, etc..) goes to the original author: Kvindesland

Other references:

Eimac is available at http://www.eimac.com/.

3-500Z is now produced by Triton Services, Inc of Dunkirk, MD USA. They may be contacted at Triton Electron Technology Division, 3100 Charlotte Avenue, Easton, PA 18042. Phone - 610 252-7331, FAX - 610 258-6279.):

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