EF93 as a triode . . .(Reposted from The Brewery)

Hi there,

  i read that MAnley use a pair of 6BA6/EF93's running as triodes as a substitute for 6386 in their vari-mu compressor. I am keen to experiment. I was just wondering, when connecting EF93 as a triode,(actually, I got some HF93's) do I just ignore the other grids(pin 2 and pin 6), or should they be connected in any way? - perhaps all three are strapped together?

  I cannot find any schematic showing anything like this. I would happily just try it and see, but I don't want to fry me tubes!



        KIndest regards,


          ANdyP

Usually, just connect the suppressor to the cathode (this is internally connected on some pentodes already), and connect the screen to B+. I have also seen cases where both are connected to B+, but not so often.

Hi Roddy,



  thanks!


    ANdyP

rodabod said:

... and connect the screen to B+.

Click to expand...

You mean 'connect the screen to the plate'?

Hi,


  from the application notes for 6ab6/12ab6 etc, what roddy said makes perfect sense! Excerpt below . . .

MagnetoSound said:

rodabod said:

... and connect the screen to B+.

Click to expand...

You mean 'connect the screen to the plate'?

Click to expand...

Apologies! Yes, I mean the plate. Tie them together. I should know not to start typing when I've just got into work.