Re: Advice on this linestage build
The first valve does have a grid resistor (470K).
With the EF86 in pentode mode the gain will be about 110.
To be honest: I am not sure about the effect of the high output impedance of the second valve in your circuit (which will be even higher with the EF86 in pentode mode) on the way the controls will work (will the frequency curves be the same?). In the schematic you linked to, the second valve is followed by a cathode-follower, which has low output impedance (and a 'gain' of a little under 1).
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Robert
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