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Everything Chip says is 100% correct.

As long as you have provided an adequate load for V1, and as long as your coupling cap is of a reasonable value; I've found that tubes generally sound better with lower grid resistor values. [This is one of the primary reasons that grid chokes perform so well.]

My rule of thumb for 'adequate load' is 20 times the preceding stage. The 6N1P's plate resistance is 4k4 - in parallel with the 47k plate resistor, we see a net resistance of 4k032. 20 times that is 80k64. So, you could probably reduce your R(g) to 82k.

But: for full-range response, 82k would require a coupling cap of at least 0.388 uf. Because I like to keep my coupling caps at 0.22 uf or smaller (whenever possible), AND because you already have an 0.22 uf installed, I suggested 150k.

FWIW: an R(g) of 82k with a 0.22 uf coupling cap moves the knee to 8.8 Hz. Depending upon your OPT and system you might never be aware of any low frequency phase shift.




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