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The MacGuffin - A Dumble ODS preamp with submini tubes | PedalPCB Community Forum
Secret Preamp
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Malin Amplification Dumble clone Pre-amp - Hand Wired | Reverb
Peace Hill FX ODS Tube Preamp - Does A Tube Preamp Make Any Difference To Your Tone? - Part 3 - YouTube
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SUNCOAST ANALOG
The MacGuffin - A Dumble ODS preamp with submini tubes | PedalPCB Community Forum
