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Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode

GU78B

Transmitting power tetrode designed for RF amplification, linear/SSB service, oscillation, modulation, broadcasting, or frequency multiplication.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
27 V / -

Description

The GU-78B tetrode is used for power amplification in distributed and single-sideband amplifiers at frequencies up to 250 MHz in RF industrial engineering. It is forced-air-cooled metal-ceramic construction.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
27 V
Nominal heater current
-
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Max plate voltage
6200 V
Max screen voltage
350 V
Max plate dissipation
2500 W
Max screen dissipation
30 W
Max grid dissipation
1 W
Max cathode current
2.2 A

Promoted-field audit performed from English ratings/characteristics; detailed electrical values retained in parameter table. REDO promoted-field audit completed from English Limit Operating Values / Electrical Parameters tables.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1968 Electronintorg

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • power amplification in di [1]

    786 W

    eHepaTopHbin TeTpoa [Y-786 npeaHasHaqeH gng The I'Y-78b tetrode is used for power amplification in di-

  • power amplification in di [2]

    78 W

    eHepaTopHbin TeTpoa [Y-786 npeaHasHaqeH gng The I'Y-78b tetrode is used for power amplification in di-

  • Cathode: indirectly heated, oxide-coated

    21521

    Cathode: indirectly heated, oxide-coated. 21521

  • grid [1]

    2

    thode, grid 2 and anode and pin leads of grid 1. Bropas; K — katoa;

  • grid [2]

    1

    thode, grid 2 and anode and pin leads of grid 1. Bropas; K — katoa;

  • anode

    1

    C1-grid 1; A —anode;

  • cathode

    2

    C2 - grid 2; K — cathode;

  • heater; / - contact sur [1]

    1.8

    Mass: at most 1.8 kg. 52724 11— heater; / - contact sur-

  • heater; / - contact sur [2]

    52724

    Mass: at most 1.8 kg. 52724 11— heater; / - contact sur-

  • heater; / - contact sur [3]

    11

    Mass: at most 1.8 kg. 52724 11— heater; / - contact sur-

  • temperature, °C [1]

    150 C

    YCKOPEHUEM, M/C% . . ... ... ... .. ... 150 Ambient temperature, °C .. ........ ... .. —60to +70

  • temperature, °C [2]

    -60 C

    YCKOPEHUEM, M/C% . . ... ... ... .. ... 150 Ambient temperature, °C .. ........ ... .. —60to +70

  • temperature, °C [3]

    70 C

    YCKOPEHUEM, M/C% . . ... ... ... .. ... 150 Ambient temperature, °C .. ........ ... .. —60to +70

  • voltage (ACorDC),V [1]

    27 V

    .. .. .. .. 27 Heater voltage (ACorDC),V . .................. 27

  • voltage (ACorDC),V [2]

    27 V

    .. .. .. .. 27 Heater voltage (ACorDC),V . .................. 27

  • voltage, V [1]

    300 V

    CEeTKM BTOPOM . .. ... 300 Negative grid 1 bias voltage, V .. .............

  • voltage, V [2]

    1 V

    CEeTKM BTOPOM . .. ... 300 Negative grid 1 bias voltage, V .. .............

  • voltage [1]

    51 V

    CMEWEHUA CETKU NEPBOW . . . .. .. .. .ot MUHYC 51-25 Negative cutoff voltage (at anode voltage

  • voltage [2]

    -25 V

    CMEWEHUA CETKU NEPBOW . . . .. .. .. .ot MUHYC 51-25 Negative cutoff voltage (at anode voltage

  • current [1]

    3 mA

    3anMpanns (Npuy HaNPSHKEHNAX 3 kV, anode current 20 mA),

  • current [2]

    3 mA

    3anMpanns (Npuy HaNPSHKEHNAX 3 kV, anode current 20 mA),

  • current [3]

    20 mA

    3anMpanns (Npuy HaNPSHKEHNAX 3 kV, anode current 20 mA),

  • voltage

    1 mA

    Tok, mA: Anode current at zero grid 1 voltage

  • voltage [1]

    15 V

    AHOOA . o oot 1,5-10° (at anode voltage 250 V), mA,atmost . ........... 4.2

  • voltage [2]

    -10 V

    AHOOA . o oot 1,5-10° (at anode voltage 250 V), mA,atmost . ........... 4.2

  • voltage [3]

    250 V

    AHOOA . o oot 1,5-10° (at anode voltage 250 V), mA,atmost . ........... 4.2

  • voltage [4]

    4.2 V

    AHOOA . o oot 1,5-10° (at anode voltage 250 V), mA,atmost . ........... 4.2

  • voltage [1]

    2 uA

    aHoaa Hynesow (MPU HANPSKEHUAX Grid 2 current at zero grid 1 voltage

  • voltage [2]

    1 uA

    aHoaa Hynesow (MPU HANPSKEHUAX Grid 2 current at zero grid 1 voltage

  • voltage [1]

    250 V

    aHoga 250 B, ceTku nepsou 0 B), (at anode voltage 250 V), mA,atmost .. .......... 0.9

  • voltage [2]

    0 V

    aHoga 250 B, ceTku nepsou 0 B), (at anode voltage 250 V), mA,atmost .. .......... 0.9

  • voltage [3]

    250 V

    aHoga 250 B, ceTku nepsou 0 B), (at anode voltage 250 V), mA,atmost .. .......... 0.9

  • voltage [4]

    0.9 V

    aHoga 250 B, ceTku nepsou 0 B), (at anode voltage 250 V), mA,atmost .. .......... 0.9

  • Mutual conductance, mA/V

    42 mA/V

    HEMEHEE . . .. oot 4,2 Mutual conductance, mA/V . .........

  • voltage [1]

    9 V

    HEOOMBE .. .ottt e e 0,9 at heater voltage 27 V, atleast ............... 25

  • voltage [2]

    27 V

    HEOOMBE .. .ottt e e 0,9 at heater voltage 27 V, atleast ............... 25

  • voltage [3]

    25 V

    HEOOMBE .. .ottt e e 0,9 at heater voltage 27 V, atleast ............... 25

  • voltage [1]

    40 V

    KpyTusHa xapaktepucTuku, MA/B .. ... ... ... .. 40-80 at heater voltage 25.7 V, atleast ............. 2.2

  • voltage [2]

    -80 V

    KpyTusHa xapaktepucTuku, MA/B .. ... ... ... .. 40-80 at heater voltage 25.7 V, atleast ............. 2.2

  • voltage [3]

    25.7 V

    KpyTusHa xapaktepucTuku, MA/B .. ... ... ... .. 40-80 at heater voltage 25.7 V, atleast ............. 2.2

  • voltage [4]

    2.2 V

    KpyTusHa xapaktepucTuku, MA/B .. ... ... ... .. 40-80 at heater voltage 25.7 V, atleast ............. 2.2

  • input [1]

    100

    knacca AB;, kBT, He meuee: input ... 100-150

  • input [2]

    -150

    knacca AB;, kBT, He meuee: input ... 100-150

  • output [1]

    25

    ... . 2,5 output .. ... 15-30

  • output [2]

    15

    ... . 2,5 output .. ... 15-30

  • output [3]

    -30

    ... . 2,5 output .. ... 15-30

  • voltage (ACorDC),V [1]

    257 V

    Hanpsbkenve Hakana, (~mnn=),B .............. 25,7-28,3 Heater voltage (ACorDC),V . ..................

  • voltage (ACorDC),V [2]

    -283 V

    Hanpsbkenve Hakana, (~mnn=),B .............. 25,7-28,3 Heater voltage (ACorDC),V . ..................

  • voltage (DC), V [1]

    350 V

    . .. 350 Grid 2voltage (DC), V. ...... .. ... .. ... ... ...... 350

  • voltage (DC), V [2]

    2 V

    . .. 350 Grid 2voltage (DC), V. ...... .. ... .. ... ... ...... 350

  • voltage (DC), V [3]

    350 V

    . .. 350 Grid 2voltage (DC), V. ...... .. ... .. ... ... ...... 350

  • voltage (DC, absolute

    1 V

    OTpuyarenbHOe HaNpPsiXXeHne CeTKn Nepeom Negative grid 1 voltage (DC, absolute

  • current (DC component), mA

    2200 mA

    Tok kaTtoga (NocTosHHan cocTasnsaowan), mA . . . .. 2200 Cathode current (DC component), mA . ...........

  • current (DC component), mA

    1 mA

    Tok nepeoit ceTku (MOCTOAHHAA Grid 1 current (DC component), mA . .............

  • Dissipation, W

    25 W

    cocTasnslowas), MA ... ... 25 Dissipation, W: