Aft Preamp treble issue

Hello! As a disclaimer, this is my first non-kit build.

With the switch in the full position, the pedal sounds exactly as it should (albeit it little low forward for my rig). In the treble position, though, there’s a volume drop from the full position, and it sounds like it’s being squeezed through a compressor in a bad way. I am using an AC187 instead of an OC139 as it’s what I could find. Would that cause this issue straight up, or can y’all find something I might’ve mucked up to cause this instead? I did have the transistor flipped so I know at least that’s right now haha, and I reflowed a couple questionable spots. I’ve also checked previous threads for a similar issue, this forum seems amazing and I look forward to being a part of it! IMG_6107.jpeg IMG_6108.jpeg
 
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