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  1. R

    Mitsubishi 5218A Op-amp

    Folks...I have a couple of this chips...any suggestions for what pedal can I use it? They was used by Boss at some point on japanese SD-1
  2. R

    Thermionic Deluxe change the frequency and "Q" of mid control

    Hi guys! Could someone help me with this??? I want the mid knob to operate at a higher frequency range with a little narrower bandwidth but i have ZERO knowledge about which component should I change and how to do the math for the desired results. I found some explanations about active band...
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