DC30 and voltage dividers

[nee]

Greetings!

I have a Matchless DC30 clone. As you know, the DC30 has 2 channels, one 12ax7 based and one EF86 based. Ideally this should be perfect for using a simple A/B box to switch channels, but I've found the gain of each channel to be too different to make this workable in practice.

Channel 1 (12ax7) has much less gain than channel 2. I made a small mod to decrease channel 2's gain by replacing the 330K plate resistor with a 220K.

I'm now looking at the output of the channels to the PI. Channel 1 has a voltage divider of 220K/100K before the PI. Channel 2 has a 1M volume pot/470K. My (limited!) theory tells me that increasing channel 1's 100K would increase the gain from channel 1 to the PI.

Question 1: Would the effect of this just be an overloading of the PI tube at a lower volume setting, or would some frequency shift also occur?

With channel 2, again theory tells me that decreasing the 470K resistor will decrease gain. However I'm not sure what effect the volume control has on the principle of the voltage divider, it being concerned with ratios and all that maths stuff.

Question 2: Would anything wiggy start happening as the volume pot reaches the extremes of its travel?

Thanks!