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EL34[Under Construction]

 

 

 

 

 

 

 

EL34 is A.F. Output Pentode suitable for use in power amplification

 

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Quick reference data

  •     Anode current Ia=100mA

  •     Transcoductance S=12,5mA/V

  •     Amplification mg2g1=11

  •     Output power, Class B  WO=100W

Heating

Heating is indirect by AC or DC, with parallel supply. 

Heater voltage  Vf  6,3 (V)
Heater current  If  1,5 (A)

Dimensions and connections

Base: Octal

 

Operating characteristics

  •     Class A
Supply voltage  Vb 265 265 (V)
Anode voltage  Va 250 250 (V)
Grid No. 2 series resistor  Rg2 2 0 (kW)
Grid No. 3 voltage  Vg3 0 0 (V)
Grid No 1 . voltage  Vg1  -14,5 -13,5 (V)
Anode current  la 70 100 (mA)
Grid No. 2 current  Ig2  10 14,9 (mA)
Transconductance  S 11 12,5 (mA/V)
Amplification factor  mg2g1 11 11  
Internal resistance  Ri 20 17 (kW)
Load resistance  Raa 3 2 (kW)
Grid No. 1 driving voltage  Vi 9,3 8,7 (VRMS)
Output Power WO 8 11 (W)
Distortion  dtot 10 10 (%)
Grid No. 1 driving voltage for WO = 50 mW  Vi 0.65 0,5 (VRMS)
  •     Class B, two tubes in push-pull
Common grid No.2 series resistor 
(non decoupled)		 Rg2 1000  470  (W)
Grid No.1 voltage  Vg1 -38 -32 (V)
Grid No. 3 voltage Vg3 0 0 (V)
Grid No. 1 driving voltage Vi 0 27 27 0 22,7 22,7 (VRMS)
Load resistance Raa   3,4 4   2,8 3,8 (kW)
Stupply voltage Vb 425 425 400 375 375 350 (V)
Anode voltage Va 420 400 375 370 350 325 (V)
Anode current la 2×30 2×120 2×100 2×35 2×120 2×93 (mA)
Grid No. 2 current Ig2 2×4,4 2×25 2×25 2×4.7 2×25 2×25 (mA)
Output power WO 0 55 45 0 44 36 (W)
Distortion dtot   5 6   5 6 (%)

 

Common grid No.2 series resistor 
(non decoupled)		 Rg2 750 750 (W)
Grid No.1 voltage  Vg1 -36 -39 (V)
Grid No. 3 voltage Vg3 0 0 (V)
Grid No. 1 driving voltage Vi 0 25,8 25,8 0 23,4 23,4 (VRMS)
Load resistance Raa   4 5   11 11 (kW)
Stupply voltage Vb 500 500 475 800 800 750 (V)
Anode voltage Va 495 475 450 795 775 725 (V)
Anode current la 2×30 2×125 2×102 2×25 2×91 2×84 (mA)
Grid No. 2 current Ig2 2×4 2×25 2×25 2×3 2×19 2×19 (mA)
Output power WO 0 75 58 0 100 90 (W)
Distortion dtot   5 6   5 6 (%)
  •     Class AB, two tubes in push-pull
Load resistance Raa

3,4

 (kW)
Common grid No.2 series resistor 
(non decoupled)		 Rg2

470

 (W)
Common cathode resistor Rk 130 (W)
Grid No. 3 voltage Vg3 0 (V)
Grid No. 1 driving voltage Vi 0 21 (V)
Stupply voltage Vb 375 375 (V)
Anode to earth voltage Va+VRk 355 350 (V)
Anode current la 2×75 2×95 (mA)
Grid No. 2 current Ig2 2×11.5 2×22.5 (mA)
Output power WO 0 35 (W)
Distortion dtot   5 (%)

 

Limiting - maximal values (design center rating system)

Anode voltage Vao 2000 (V)
Va 800
Grid No. 2 voltage Vg2o 800 (V)
Vg2 500
Anode dissipation Wa(Vi=0) 25 (W)
Wa(Vi>0) 27,5
Grid No. 2 dissipation Wg2 8 (W)
Cathode current Ik 150 (mA)
Grid No. 1 resistor Rg1(Class A & AB) 0,7 (MW)
Rg1(Class B) 0,5
Cathode to heater voltage Vkf 100 (V)

 

See graphs   1    2

 

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Copyright © 2002 Ei Elektronske Cevi DOO
Last modified: 26.01.2003