Surfy Industries | SurfyVibe | Magnatone Inspired Vibrato
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The SurfyVibe circuit is emulating the mono channel of a Magnatone 280. The "sweeping" mode adds a feedback path to create a unique effect that is a mix of phaser / chorus / tremolo.
The original circuit in the Magnatone 280 used a component called "varistor", a type that has been obsolete for years. This is the reason modern circuits use other techniques to achieve pitch shift.
To get the sound as close to the original as possible, we have found a way to emulate the original circuit. We replace the tubes with jFET transistors and the varistors with special diode arrays.