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Common sense.

Check with an ohmmeter if the supressor (or beam plates; G3) are connected to the cathode.  If so, leave them alone.  If not, connect them to G2.  In either case connect G2 to G1 with a resistor, value depending on your operating plate voltage.  Value of the resistor can be relatively small (few hundred ohms) if the plate voltage of the tube is reasonably below the 155v rating, should be larger (few kilohms) if you're close or a little above the rating.  My experience is that in no circumstance should you operate the tube in triode at more that five or ten volts over the screen rating, unless you like dangerous fun.

I would suggest that G3 is in fact very probably connected internally to the cathode, since I didn't see any voltage ratings for it.

Aloha,

Poinz

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