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BURLE
BURLE

8986 Datasheet Preview

8986 Datasheet

Beam Power Tube

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8986 pdf
8986
Power Tube
Beam Power Tube
- FM Broadcast Service
15 kW Output
20 dB Gain
80% Efficiency
- High Efficiency-Low Pressure Radiator
The BURLE 8986 is designed specifically for use in high-gain,
high-efficiency FM service.
Rated for full input to 150 MHz, the tube is easily circuited to this
frequency. The terminals are coaxial for operation in the TEM
mode and the radiator location avoids restriction of the resonant
cavity circuits in VHF operation.
Its sturdy, coaxial construction and thoriated-tungsten mesh
filament minimize tube inductances and feed-thru capacitances.
They make possible the use of simple, economical, broadband
circuit techniques in VHF operation.
This data sheet gives application information unique to
the BURLE 8986. It is to be used in conjunction with the
publication, “Application Guide for BURLE Power Tubes”,
TP-105, for general application information for tubes of
this type.
Additional information of a general nature applicable to tubes of
this type is given in the following publications:
TP-105 Application Guide for BURLE Power Tubes
TP-122 Screen-Grid Current, Loading and Bleeder Considera-
tions
TP-117 Handling and Operating Considerations When Using
BURLE Tetrodes
TP-118 Application Guide for Forced Air Cooling BURLE Power
Tubes
Close attention to the instructions contained in these publica-
tions will assure longer tube life, safer operation, less equipment
downtime and fewer tube handling accidents. For copies of
these publications, specific information or application assis-
tance, contact your nearest BURLE Representative or write
BURLE INDUSTRIES INC., New Holland Avenue, Lancaster, PA
17601.
General Data
Electrical
All voltages referenced to cathode, unless otherwise specified.
Filamentary Cathode, Thoriated-Tungsten Mesh Type:
Voltage (ac or dc) ........................................................ See Note 1
Current:
Typical value at 11 .0 volts2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
A
Maximum value for starting,
even momentarily 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
A
Cold resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01 ohm
Recommended heating time3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 sec
Mu-Factor4, (Grid No.2 to grid No.1) ................................ 11
Direct Interelectrode Capacitances:
pF
Grid No.1 to filament . . . . . . . . . . . . . . . . . . . .......................... 85
Plate to filament5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1
pF
pF
Grid No.1 to grid No.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 pF
Grid No. 2 to plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Grid No. 2 to filament6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2
pF
pF



BURLE
BURLE

8986 Datasheet Preview

8986 Datasheet

Beam Power Tube

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8986 pdf
Mechanical
Operating Attitude ............................................. Vertical, anode up
Overall Length (Max.) . . . . . . . . . . . ........................... 199.39 mm (7.85 in)
Greatest Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180.20 mm (7.1 in)
Socket ........................................... CD89-0857 or equivalent
Radiator . . . . . . . . . . . . . . . . ........................................ Integral part of tube
Weight (Approx.) . . . . . . . . . . . . . . . . ........................................ 5.5 kg (12 Ibs)
Thermal
Seal ........................................ 2 5 0 m a x . ° C
(Plate, Grid
Grid
Cathode-Filament, and Filament)
Plate-Core
. . . . . . . . . . . . . . . . ........................................ 2 5 0 m a x . ° C
RF Power Amplifier Class C, FM Telephony
Maximum CCS Ratings, Absolute-Maximum Values
Up to 150 MHz
DC Plate
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13,000
V
DC Grid-No.2 Voltage10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000
DC Grid-No.1 Voltage13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -600
V
V
DC Plate Current ....................... . . . . . . . . . . . . . . . . . . . . . . . . . . 3
A
DC Grid-No.1 Current ............................................ 0.3
A
Grid-No.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
w
Grid-No.2 Input ,................... . . . . . . ................................. 250 W
Plate Dissipation11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,500
W
Grid Driven, Class C, CCS Operation
Typical Data at 108 MHz
DC Plate Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9000
DC Grid-No.2 Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000
DC Grid-No. 1 Voltage ................................................. -300
DC Plate Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. .1
DC Grid-No.2 Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . ........ 0.10
DC Grid-No.1 Current ................................. . . . . ......... 0.06
Driver Power Output .12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Useful Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ 15,200
Overall Plate Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Gain ,................................................................. 20.5
V
V
V
A
A
A
W
W
%
1. The typical filament voltage is 11.0 volts, ac or dc. The maximum
filament voltage, measured at the tube terminals, is 11.5 volts. For
maximum life, the filament power should be regulated at the
lowest value that will give satisfactory performance.
For accurate data, ac filament voltage should be measured using
an RMS type meter such as an iron-vane or thermocouple type.
DC voltage should be measured using a high input impedance
type meter.
For those applications where hum is a critical consideration, dc
filament voltage or hum-bucking circuits are recommended.
See Application Note TP-117 for further information.
2. It is recommended that additional current be available to allow for
both product variation and the normal reduction of filament resis-
tance with life. Thus the filament supply adjustment should be
designed for a capability of 130 amperes at 11.5 volts.
3. Recommended starting procedure for maximum stability and
longest life:
Standard: Filament heating time of 30 seconds followed by
plate, grid-No.2, and RF drive.
Emergency: Filament heating time of 15 seconds followed by
plate, grid-No.2, and RF drive.
4. For plate voltage = 2000 V, grid-No.2 voltage = 1200 V, and plate
current = 12 A.
5. external flat metal shield 200 mm (8”) in diameter having a
center hole 76 mm (3”) in diameter. Shield is located in plane of
the grid-No.2 terminal, perpendicular to the tube axis, and is
connected to grid
6. With external flat metal shield 200 mm (8”) in diameter having a
center hole 60 mm
in diameter. Shield is located in plane
of the grid-No.1 terminal, perpendicular to the tube axis, and is
connected to grid
7. As manufactured by: Jettron Products Inc.
65 Route 10
P.O. Box 337
East Hanover, NJ 07938
8. See Dimensional Outline for Temperature Measurement Points.
For good contact-finger life, a maximum temperature of 180 °C at
the terminal is recommended when using commercially-available
beryllium-copper socket contacts.
9. The maximum voltage ratings must be modified for operation at
altitudes higher than sea level and for temperatures in excess of
20°C in accordance with the curves of Figure 1. For altitude
derating of the plate voltage, use the voltage difference between
plate and grid
The fault energy dissipated within the tube during a high-voltage
arc or fault must be limited by resistors or fault protection circuitry
such as spark gaps or electronic “crowbars”. This is especially
important where large capacitors storing high energy are used.
The following current limiting resistance values are recom-
mended:
Plate 10 to 50 ohms
Grid No.2 Fifty ohms minimum
Grid No.1 Fifty ohms minimum
For additional information see TP-105, “Application Guide for
BURLE Power Tubes”.
10. See TP-105 and TP-122. Protection devices such as spark gaps
should be used.
11. Permitted plate dissipation is a function of cooling. For specific
ratings see Forced-Air Cooling information in this data sheet.
12. Driver power output represents circuit losses in the grid input
circuit in addition to the power necessary to drive the tube.
13. See TP-105. Protection devices such as spark gaps or positive
clamping diodes should be used.
14. To limit filament surge current, a series resistor is recommended;
the resistor can then be shorted after 15 seconds.
Operating Considerations
Safety Precautions
Protection circuits serve a threefold purpose: safety of person-
nel, protection of the tube in the event of abnormal circuit
operation, and protection of the tube circuits in the event of
abnormal tube operation.
Warning Personal Safety Hazards
Electrical Shock Operating voltages applied to this device
present a shock hazard.
X-Ray Warning This device in operation produces X-rays
which can constitute a health hazard unless the device is
adequately shielded for radiation.
RF Radiation This device in operation produces RF radia-
tion which may be harmful to personnel.


Part Number 8986
Description Beam Power Tube
Maker BURLE
Total Page 6 Pages
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