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Suppressor grid g3 action measurements

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Forum » Technique, Repair, Restoration, Home construction ** » Home construction and general radio technique » Suppressor grid g3 action measurements
           
Joe Sousa
Joe Sousa
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USA  Articles: 655
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06.Jul.09 00:31

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Tube enthusiasts,

I have posted several plate current sweeps to illustrate the effect of Suppressor grid g3 on plate current.

The plots can be found at

http://www.radiomuseum.org/forum/1619_1619_suppressor_action.html

http://www.radiomuseum.org/forum/el81_el81_suppressor_action.html

http://www.radiomuseum.org/forum/6hb6_6hb6_suppressor_action.html

http://www.radiomuseum.org/forum/12hl7_12hl7_suppressor_action.html

http://www.radiomuseum.org/forum/6as6_6as6_suppressor_action.html

This last tube type was designed for strong control action by the suppressor grid g3.

The effect of g3 for the other tubes is fairly week for negative voltages down to -40V, while positive voltages at +40V and +150V were found to add a tetrode characteristic to the plate current.

A subtle but significant effect was found with the application of +7.4V to g3 of the DF97. Voltage gain increased by 3x, with an increase of 3x in plate resistance. See:

http://www.radiomuseum.org/forum/df97_pentode_and_tetrode_curves.html

The effect of the suppressor grid was also addressed at these threads:

http://www.radiomuseum.org/forum/app4120_gitter_1_3_parallel.html

http://www.radiomuseum.org/forum/6f6eg_6f6eg.html

http://www.radiomuseum.org/forum/homebrew_radio_help.html

Regards,

-Joe

Joe Sousa
Joe Sousa
Editor
USA  Articles: 655
Schem.: 193
Pict.: 418
07.Nov.10 01:38

Count of Thanks: 5
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Fellow Radiophiles,

The Suppressor grid G3 characteristics for the EF50 have been posted.

Regards,

-Joe

This article was edited 07.Nov.10 01:39 by Joe Sousa .

Joe Sousa
Joe Sousa
Editor
USA  Articles: 655
Schem.: 193
Pict.: 418
07.Nov.10 06:40

Count of Thanks: 9
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Fellow Radiophiles:

A overview of the operation of dual control pentodes has been posted.

Regards,

-Joe

  
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