8T39

Other

• The NEC

  8739

  The NEC 8739 is a vapour cooled triode with a maximum plate

• dissipation rating of

  10 kW

  dissipation rating of 10 kW, The tube is a vapour cooled

• fficiency [1]

  1

  fficiency 1is easily obtainable at relatively 1low plate

• fficiency [2]

  1

  fficiency 1is easily obtainable at relatively 1low plate

• Maximum Starting Current [1]

  0 mA

  Maximum Starting Current ....... 00000 ’120 amps

• Maximum Starting Current [2]

  120 A

  Maximum Starting Current ....... 00000 ’120 amps

• Amplification FRCLOr ..eeee sesvcvrosonens

  40

  Amplification FRCLOr ..eeee sesvcvrosonens 40 G: Grid ,

• Grid to Plate .. ..iciennanneeans chenes

  26

  Grid to Plate .. ..iciennanneeans chenes 26 uuk TERMINAL CONNECTIONS

• Grid to Filament ...cuieeeececvcnssosnn

  49

  Grid to Filament ...cuieeeececvcnssosnn 49 P

• Plate to Filament ... ieeiieeiinnerennes

  0.7

  Plate to Filament ... ieeiieeiinnerennes 0.7 uuF

• Filament connecctor (

  2

  Filament connecctor (2 required} et eseesesets

• Grid connector ....... it e et ecsesitceier st es et esnca o e s st s ecnasconnn o NEC VT3

  5

  Grid connector ....... it e et ecsesitceier st es et esnca o e s st s ecnasconnn o NEC VT305

• approx

  35

  approx. 35 mm diameter into center of the filament terminals.

• Note

  2

  Note 2. Adequate forced-air flow is required +to limit +the temperature of the

• ”flfg”n }':' tlon of fllamentvoltage.:'

  3 V

  .”flfg”n }':' tlon of fllamentvoltage.:' 3 f, EUNNRRRE 'fv ;,"

• DC Plate VOLtage «uuveevvsssessnsosesesassessasssnsnessansssssssneess

  10000 V

  DC Plate VOLtage «uuveevvsssessnsosesesassessasssnsnessansssssssneess 10000 volts

• " Max. Signal DC Plate Current (Note [1]

  4 A

  " Max. Signal DC Plate Current (Note 4) ........,.....s...;,.;....;.... 2.5 amps

• " Max. Signal DC Plate Current (Note [2]

  2.5 A

  " Max. Signal DC Plate Current (Note 4) ........,.....s...;,.;....;.... 2.5 amps

• “““ Signal Plate Inpu’o (Note [1]

  4 kW

  “““ Signal Plate Inpu’o (Note 4) uulivvieeerneabasinesorsessunnennnes 25 kW

• “““ Signal Plate Inpu’o (Note [2]

  25 kW

  “““ Signal Plate Inpu’o (Note 4) uulivvieeerneabasinesorsessunnennnes 25 kW

• DC Plate Voltage [1]

  4 V

  DC Plate Voltage 4‘.'"..'.A..'..'"..'-.....-‘.v.....r- “. .»“.‘.'......"' 5000 8000 "olts

• DC Plate Voltage [2]

  5000 V

  DC Plate Voltage 4‘.'"..'.A..'..'"..'-.....-‘.v.....r- “. .»“.‘.'......"' 5000 8000 "olts

• DC Plate Voltage [3]

  8000 V

  DC Plate Voltage 4‘.'"..'.A..'..'"..'-.....-‘.v.....r- “. .»“.‘.'......"' 5000 8000 "olts

• ~ Peak AF Grid-to-Grid Voltage '...;..J;.};.{..;{.........; [1]

  600 V

  ~ Peak AF Grid-to-Grid Voltage '...;..J;.};.{..;{.........;:... 600 900 volts

• ~ Peak AF Grid-to-Grid Voltage '...;..J;.};.{..;{.........; [2]

  900 V

  ~ Peak AF Grid-to-Grid Voltage '...;..J;.};.{..;{.........;:... 600 900 volts

• AZero Slgnal DC Plate Current ‘.,.}..;.;.....;.....L [1]

  200 mA

  AZero Slgnal DC Plate Current ‘.,.}..;.;.....;.....L.......... 0.2 0.2 amps

• AZero Slgnal DC Plate Current ‘.,.}..;.;.....;.....L [2]

  200 mA

  AZero Slgnal DC Plate Current ‘.,.}..;.;.....;.....L.......... 0.2 0.2 amps

• Max. Signal DC Plate Current ateecescssescessessnrrcacssnessee [1]

  247 A

  Max. Signal DC Plate Current ateecescssescessessnrrcacssnessee 247 4 a..ps

• Max. Signal DC Plate Current ateecescssescessessnrrcacssnessee [2]

  4 A

  Max. Signal DC Plate Current ateecescssescessessnrrcacssnessee 247 4 a..ps

• DC Grid CUITENt eeeeeueeesnecssecsneecaneenees [1]

  160

  DC Grid CUITENt eeeeeueeesnecssecsneecaneenees 160 240 milliazps

• DC Grid CUITENt eeeeeueeesnecssecsneecaneenees [2]

  240

  DC Grid CUITENt eeeeeueeesnecssecsneecaneenees 160 240 milliazps

• Effecfive Load Resistance, Plate to Plate ......¢ccecevnenens [1]

  3500

  Effecfive Load Resistance, Plate to Plate ......¢ccecevnenens 3500 4200 ohms

• Effecfive Load Resistance, Plate to Plate ......¢ccecevnenens [2]

  4200

  Effecfive Load Resistance, Plate to Plate ......¢ccecevnenens 3500 4200 ohms

• Max, Signal Driving Power'(afprox.)‘ O S [1]

  45 W

  Max, Signal Driving Power'(afprox.)‘ O S 45 100 ¥

• Max, Signal Driving Power'(afprox.)‘ O S [2]

  100 W

  Max, Signal Driving Power'(afprox.)‘ O S 45 100 ¥

• Max., Signal Power Output (approx.) et e e eea e [1]

  8 kW

  Max., Signal Power Output (approx.) et e e eea e 8 22 kW

• Max., Signal Power Output (approx.) et e e eea e [2]

  22 kW

  Max., Signal Power Output (approx.) et e e eea e 8 22 kW

• Note

  4

  Note 4. Averaged over any audio-frequency cycle of sine-wave form.

• DCPlate V’°lta~ge Qt'oll".tv'-l--qcoOoolcOlllc'lolclo'Oilll.oflcvo;tpl.OIOO

  75

  DCPlate V’°lta~ge Qt'oll".tv'-l--qcoOoolcOlllc'lolclo'Oilll.oflcvo;tpl.OIOO 75% YG}L.‘:

• '-B\‘,Grid\‘altage e ieesevtiantsasetatatsteteansrsasersasansassennsesss =

  1000

  '-B\‘,Grid\‘altage e ieesevtiantsasetatatsteteansrsasersasansassennsesss =1000 volts

• DC Grid Current ..,

  400 mA

  DC Grid Current ..,. 0.4 anps

• Plate Input ...............;.;....................;..;........;

  15

  Plate Input ...............;.;....................;..;........;....... 15 k9

• Plate Dissipation ..eveuieersrieceeieracenenseesoresns

  6.6 kW

  Plate Dissipation ..eveuieersrieceeieracenenseesoresns 6.6 kW

• Grid Dissipation T

  250 W

  Grid Dissipation T 250 ¥

• DG Plate VOLULAGE «rvsessiisennsnnsneesnesntoneeiueseesieaarensianees

  5000

  DG Plate VOLULAGE «rvsessiisennsnnsneesnesntoneeiueseesieaarensianees 5000 volts

• ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“ [1]

  7 V

  ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“7“_’””"_”“““ '—400»1.'011?3

• ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“ [2]

  -400 V

  ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“7“_’””"_”“““ '—400»1.'011?3

• ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“ [3]

  1 V

  ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“7“_’””"_”“““ '—400»1.'011?3

• ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“ [4]

  11 V

  ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“7“_’””"_”“““ '—400»1.'011?3

• ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“ [5]

  3 V

  ADC'_Grild Voltage ‘.".““,“...,;._.‘_’.’._.‘_\_.“,.'.‘;"._“__"_‘“7“_’””"_”“““ '—400»1.'011?3

• DC.P1ate Current. .............;.......,,.....L....;..,.....;.......... '

  1.55 A

  DC.P1ate Current. .............;.......,,.....L....;..,.....;.......... '1.55 amp ...

• DC Grid Current (approx.) .;.;Q;;.;;:.......l:;;,}}....;f....;.,;..... '

  330 mA

  DC Grid Current (approx.) .;.;Q;;.;;:.......l:;;,}}....;f....;.,;..... ' 0.33 amps

• " Peak RF Grid Voltage

  5730 V

  " Peak RF Grid Voltage 5730 volts

• Driving Power (approx.) ,.....,.}...;,.;;;.{......;..;..;...........}{

  220 W

  Driving Power (approx.) ,.....,.}...;,.;;;.{......;..;..;...........}{- 220 watts

• Power Output (approx.) ........‘"..'........:...‘-...'....'_...‘_.........'..*..'...‘

  76 kW

  Power Output (approx.) ........‘"..'........:...‘-...'....'_...‘_.........'..*..'...‘. 76 kW

• DC Plate Voltage

  10000 V

  DC Plate Voltage 10000 volts

• DC Grid Voltage e ettt adeiiee ettt et teatieeraneerasaass =

  1000 V

  DC Grid Voltage e ettt adeiiee ettt et teatieeraneerasaass =1000 volts

• DC Plate Current

  2.7 A

  DC Plate Current 2.7 anns

• DC Grid Current e e e e e e e e

  400 mA

  DC Grid Current e e e e e e e e 0.4 aups

• Plate Input

  27

  Plate Input ....... 27 ww

• Plate Dissipation ............ .....................,...............;

  10 kV

  Plate Dissipation ............ .....................,...............;.. 10 KV

• Grid Dissipation ..... Cr e eeestestausenssan st se st arat v srsreseunnn

  2950 W

  Grid Dissipation ..... Cr e eeestestausenssan st se st arat v srsreseunnn 2950 watts

• DC PLate VOLTAZE «evvnnnnnnnnsseeeeeeesesnsneesessseennnnnnnaes [1]

  5000

  DC PLate VOLTAZE «evvnnnnnnnnsseeeeeeesesnsneesessseennnnnnnaes 5000 9000 volts

• DC PLate VOLTAZE «evvnnnnnnnnsseeeeeeesesnsneesessseennnnnnnaes [2]

  9000

  DC PLate VOLTAZE «evvnnnnnnnnsseeeeeeesesnsneesessseennnnnnnaes 5000 9000 volts

• DC Grid VOLAEE wveeevensecnnsecnnnnsennesesenesesnnseeusnes =

  300

  DC Grid VOLAEE wveeevensecnnsecnnnnsennesesenesesnnseeusnes =300 ;Sogvolts

• Peak RF Grid VOLEAEE uesvvrennnnnnnesnennnnsesnnnnsnsannnannees [1]

  630

  Peak RF Grid VOLEAEE uesvvrennnnnnnesnennnnsesnnnnsnsannnannees 630 900 volts

• Peak RF Grid VOLEAEE uesvvrennnnnnnesnennnnsesnnnnsnsannnannees [2]

  900

  Peak RF Grid VOLEAEE uesvvrennnnnnnesnennnnsesnnnnsnsannnannees 630 900 volts

• DC Plate Current , [1]

  1.8 A

  DC Plate Current , 1.8 2.5 amps

• DC Plate Current , [2]

  2.5 A

  DC Plate Current , 1.8 2.5 amps

• DC Grid Current (@PProX.) .uieeeviecreeocrnerasnnersonasrncanes [1]

  300 mA

  DC Grid Current (@PProX.) .uieeeviecreeocrnerasnnersonasrncanes 0.3 0.3 amps

• DC Grid Current (@PProX.) .uieeeviecreeocrnerasnnersonasrncanes [2]

  300 mA

  DC Grid Current (@PProX.) .uieeeviecreeocrnerasnnersonasrncanes 0.3 0.3 amps

• Driving Power (approx.) [1]

  170 W

  Driving Power (approx.) ............ 170 250 watts

• Driving Power (approx.) [2]

  250 W

  Driving Power (approx.) ............ 170 250 watts

• Power Outpubt (BPPTOX.) vereenenesuonsnorensonsnsesossenesnnnenns [1]

  6 kW

  Power Outpubt (BPPTOX.) vereenenesuonsnorensonsnsesossenesnnnenns 6 17 kW

• Power Outpubt (BPPTOX.) vereenenesuonsnorensonsnsesossenesnnnenns [2]

  17 kW

  Power Outpubt (BPPTOX.) vereenenesuonsnorensonsnsesossenesnnnenns 6 17 kW

• FILAMENT VOLTAGE ( [1]

  2 V

  FILAMENT VOLTAGE (2f)=7.5 VOLTS AC

• FILAMENT VOLTAGE ( [2]

  7.5 V

  FILAMENT VOLTAGE (2f)=7.5 VOLTS AC