hw-101 modification

[J E Hardman]

A 500k ohm pot has been added to the back of my hw-101
and connected to board 85-130-2 in place of 1 meg
resistor. What does this do?

Also a 20ufd 350v is not installed and in place of it
mounted under board 85-130-2 is a 22uf 450v elec cap
going to .o2 cap. What mod is this?

Just purchased hw-101 and am trying to find out more
about it.
Thanks, Jody

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