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EL84

 

 

 

 

 

 

 

EL84 is A.F. Output Pentode

 

 

Quick reference data

  •     Anode current Ia=48mA

  •     Transcoductance S=11,3mA/V

  •     Amplification mg2g1=19

  •      Output power Wo=6W

Heating

Indirect by AC or DC; parallel supply.

Heater voltage  Vf  6,3 (V)
Heater current  If  760 (mA)

Dimensions and connections

Base: Noval

 

Operating characterisitcs

Operating characteristics in triode connection

Limiting - maximal values

 


Operating characteristics

  •     Class A
Anode voltage Va 250 (V)
Grid No. 2 voltage Vg2 250 (V)
Grid No. 1 voltage Vg1 -7,3 (V)
Cathode resistor Rk 135 (W)
Load resistance Ra 5,2 (kW)
Grid No. 1 driving voltage Vi 0 0,3 3,4 4,3 4,7 (VRMS)
Anode current Ia 48     49,5 49,2 (mA)
Grid No. 2 current Ig2 5,5     10,8 11,6 (mA)
Transconductance S 11,3         (mA/V)
Amplification mg2g1 19          
Internal resistance Ri 38         (kW)
Output power Wo 0 0,05 4,5 5,7 6 (W)
Distortion total dtot     6,8 10   (%)
second harmonic d2     3 2   (%)
third harmonic d3     5,8 9,5   (%)

 

Anode voltage Va 250 (V)
Grid No. 2 voltage Vg2 250 (V)
Grid No. 1 voltage Vg1 -7,3 (V)
Cathode resistor Rk 135 (W)
Load resistance Ra 4,5 (kW)
Grid No. 1 driving voltage Vi 0 0,3 3,5 4,4 4,8 (VRMS)
Anode current Ia 48     50,6 50,5 (mA)
Grid No. 2 current Ig2 5,5     10 11 (mA)
Transconductance S 11,3         (mA/V)
Amplification mg2g1 19          
Internal resistance Ri 38         (kW)
Output power Wo 0 0,05 4,5 5,7 6 (W)
Distortion total dtot     7,5 10   (%)
second harmonic d2     5,7 5   (%)
third harmonic d3     4,5 8   (%)

 

Anode voltage Va 250 (V)
Grid No. 2 voltage Vg2 250 (V)
Grid No. 1 voltage Vg1 -8,4 (V)
Cathode resistor Rk 210 (W)
Load resistance Ra 7 (kW)
Grid No. 1 driving voltage Vi 0 0,3 3,5 5,5 (VRMS)
Anode current Ia 36   36,8 36 (mA)
Grid No. 2 current Ig2 4,1   8,5 14,6 (mA)
Transconductance S 10       (mA/V)
Amplification mg2g1 19        
Internal resistance Ri 40       (kW)
Output power Wo 0 0,05 4,2 5,6 (W)
Distortion total dtot     10   (%)
second harmonic d2     1,7   (%)
third harmonic d3     8,7   (%)

 

Anode voltage Va 250 (V)
Grid No. 2 voltage Vg2 210 (V)
Grid No. 1 voltage Vg1 -6,4 (V)
Cathode resistor Rk 160 (W)
Load resistance Ra 7 (kW)
Grid No. 1 driving voltage Vi 0 0,3 3,4 3,8 (VRMS)
Anode current Ia 36   36,6 36,5 (mA)
Grid No. 2 current Ig2 3,9   7,3 8 (mA)
Transconductance S 10,4       (mA/V)
Amplification mg2g1 19        
Internal resistance Ri 40       (kW)
Output power Wo 0 0,05 4,3 4,7 (W)
Distortion total dtot     10   (%)
second harmonic d2     1,8   (%)
third harmonic d3     9,3   (%)

Notes:

  1. Grid No. 2 driving voltage measured with fixed bias
  2. Distortion at Ig1=+0,3mA
  •     Class B, two tubes in push-pull
Anode voltage Va 250 300 (V)
Grid No. 2 voltage Vg2 210 300 (V)
Grid No. 1 voltage Vg1 -11,6 -14,7 (V)
Load resistance Raa 8 8 (kW)
Grid No. 1 driving voltage Vi 0 8 0 10 (VRMS)
Anode current Ia 210 237,5 27,5 246 (mA)
Grid No. 2 current Ig2 21,1 27,5 20,8 211 (mA)
Output power Wo 0 11 0 17 (W)
Distortion dtot   3   4 (%)
  •     Class AB, two tubes in push-pull
Anode voltage Va 250 300 (V)
Grid No. 2 voltage Vg2 210 300 (V)
Common cathode resistor Rk 130 130 (W)
Load resistance Raa 8 8 (kW)
Grid No. 1 driving voltage Vi 0 8 0 10 (VRMS)
Anode current Ia 231 237,5 236 246 (mA)
Grid No. 2 current Ig2 23,5 27,5 24 211 (mA)
Output power Wo 0 11 0 17 (W)
Distortion dtot   3   4 (%)

Operating characteristics in triode connection (g2 connected to a)

  •     Class A
Anode voltage Va 250 (V)
Cathode resistor Rk 270 (W)
Load resistance Ra 3,5 (kW)
Grid No. 1 driving voltage Vi 0 1 6,7 (VRMS)
Anode current Ia 34   36 (mA)
Output power Wo   0,05 1,95 (W)
Distortion dtot     9 (%)
  •     Class AB, two tubes in push-pull
Anode voltage Va 250 300 (V)
Common cathode resistor Rk 270 270 (W)
Load resistance Raa 10 10 (kW)
Grid No. 1 driving voltage Vi 0 8,3 0 10 (VRMS)
Anode current Ia 220 221,7 224 226 (mA)
Output power Wo 0 3,4 0 5,2 (W)
Distortion dtot   2,5   2,5 (%)
Grid No. 1 driving voltage for Wo=50mW Vi   0,95   0,9 (VRMS)

 

Limiting - maximal values (design center rating system)

Anode voltage Vao 550 (V)
Va 300*
Anode dissipation Wa 12* (W)
Grid No. 2  voltage Vg2o 550 (V)
Vg2 300*
Grid No. 2 dissipation Wg2 2 (W)
Wg2p 4
Grid No. 1 voltage Vg1 -100 (V)
Cathode current Ik 65 (mA)
Grid No. 1 resistor automatic bias Rg1 1 (MW)
fixed bias 0,3
Cathode to heater voltage Vkf 100 (V)

*When the heater and positive voltages are obtained from a storage battery by means of vibrator, the max. values of Va and Vg2 are 250V and that of Wa is 9W.


 

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Copyright 2002 Ei Elektronske Cevi DOO
Last modified: 11.12.2002