BMP Input/Output Capacitors (Pharaoh Variant)

[benny_profane]

The BAT Pharaoh BMP variant has 10uF tantalum input (followed by a 100k resistor to ground) and output capacitors. I know that the 100k resistor is the bias resistor for the transistor (base to ground), but is this forming a high pass filter with the input cap?

Would there there be really a huge difference replacing the 10uF tantalum capacitors with 1uF film capacitors? If the input is forming a high pass filter, the R-C calculation puts the corner frequency for the 10uF cap is 0.2Hz and for the 1uF cap is 1.6Hz. Both of these are far below audible range, so I'm left thinking I've misunderstood something here. All of that is aside from the output cap which to me just seems enormously wide open at 10uF.

Attached is the schematic from Kit Rae's Big Muff page for reference.

[benny_profane]

I understand that input/output impedance is at play here as well. So insight on that would be great too.

[benny_profane]

Anyone have an idea here? Most of the previous threads dealt with the 470n coupling caps vs the 47n depicted in the Kit Rae schematic. I'm wondering about the input/output caps, though.