Thunderbird Amp Question

TheChris

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Apr 7, 2010
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Harvest, AL
I've owned this amp for many years. It was given to me in horrid shape, and I totally rebuilt the cab, and had an amp guy change every cap and questionable component. The speaker is original, however, I had to find a new basket for it.

My question is this - what does the 3-way vertical switch between the input jacks and the Volume knob do? Sounds like there's some EQ trickery, but, I can't seem to figure it out.

https://goo.gl/photos/vxb4E1qyQQnZhT6i8
 
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