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  1. M

    Simple Attenuators - Design And Testing

    Blue is the attenuator set to max attenuation level, green is attenuator with a 1u+20R Zobel filter (2u2+10R seemed to drastic for me). It seems that filter should be transparent for "normal" guitar frequencies with these values. I'm going experiment and let you know about the results. Once...
  2. M

    Simple Attenuators - Design And Testing

    Thanks, @JohnH! The basic idea is to add a resistor+capacitor in parallel with the rest of attenuator: It should decrease the impedance of the circuit above 3k and stop oscillations from mostly inductive load for upper frequencies. Since I assume, the power section is being overdriven, the...
  3. M

    Simple Attenuators - Design And Testing

    @JohnH, thank you for a great design! I've built the M2 version and it sounds great! Since I'm using the attenuator with a custom 36W 1959SLP clone, EL84-based power section becomes a bit fizzy when pushed hard. It is most audible when I enable all attenuation levels. However, I do also use...

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