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Old 12th May 2010, 04:10 AM   #1
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Default twin triode question

i pulled a pcb that has two 6cg7s on it and the grids on sections 2 are connected to the plates on sections 1 with 100 ohm resistors on both tubes. what is the purpose of this?

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Old 12th May 2010, 04:40 AM   #2
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It looks like the output of section 1 is direct-coupled to the input of section 2, with the 100 ohm resistor acting as a "grid stopper" to prevent possible oscillations. This may very well be a gain stage direct-coupled to a cathode-follower. You would have to trace out the rest of the circuit to see what is going on. This is not an unusual configuration.

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