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I am thinking of using pin 8 of the el84 tube socket to mount a grid resistor on the suppressor grid of pin 9. The tube manual shows that p8 is IC or internally connected. So I wanted to know if that IC tag means it is not for any kind of connections. thanx in advance, Dak
Follow Ups:
This came up not that long ago, and I went into my stash and looked at my 6BQ5/EL84 specimens to see what pin 8 was connected to.
On some tubes, pin 8 connects to nothing. On other tubes, it connects to the plate, and on others I could tell that it connected to something inside the tube's structure, but I didn't bother to measure to figure it out.
IC - internal connection - could be connected to any element or support inside. EL84s from different makers and vintages vary as to how the IC pins are connected (recent Russian ones don't show any "shorts" to these pins in a tube tester - many vintage ones do).
I wouldn't risk it unless a pin says "NC" - no connection.
Right, I have checked that on the Russian 6p14p and used pin1 to mount the grid stop resistor. Although I had to caution the user to only use Russian 6p14p or check with an DMM if pin 1 was connected to pin 2 on other el84 types. cheers, Dak
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