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Ring modulators take two inputs and multiply them by each other. The original input signals are canceled out, leaving only sidebands that are harmonically unique and often unpredictable. Of course, any mathematical model is less than perfectly carried out in the analog world, so the character of a ring modulator is determined by how it is made. Most modern ring modulators perform multiplication with a single integrated circuit. However, the concept of ring modulation was invented back in 1934 in the days of vacuum tubes. This module is constructed like the original patent document with vacuum tubes and transformers.
This module uses the original circuit arrangement where vacuum tubes and transformers perform the multiplication. The sounds of the tube circuit tend to be more harmonically rich and complex than modern ring modulators. This module excels at making bell-like sounds, edgy, FM-like bass sounds, metallic percussion textures, and otherworldly sound effects. The inputs can be used with oscillator outputs, LFOs operating within the audio range, or any audio signal. Using the same envelope to sweep the frequency of an oscillator connected to one of the inputs and the amplitude of a VCA after the ring modulator output can lead to fascinating new textures. Varying input levels also affect the overall timbre.
This module uses two 6AL5 vacuum tubes. The brand of the tubes does not seem to make a significant difference in the sound. It is unlikely that the tubes will ever need to be replaced unless they are damaged. If they are replaced, any brand may be used.
All Stoel Music Systems Eurorack modules feature aluminum front panels with a durable high-gloss white finish. For a crisp appearance and exceptional durability, the front panel markings are digitally printed at high resolution with UV-cured ink. Mounting holes are plated to significantly reduce screw rash. The power connection features polarity protection to prevent accidental damage to the module if it is connected backward.
Each module includes a 12” long 10-pin to 16-pin ribbon cable compatible with the Eurorack standard, M3 mounting screws, and a complimentary sticker.
|+12V Current Draw
|-12V Current Draw
|+5V Current Draw