Tubular Audio

Tubular Audio Vintage audio repair and resale

Another day at the shop! 📸:
10/30/2024

Another day at the shop! 📸:

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Williamsburg, OH

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Adding a resonance control to a Pultec HLF-3C Sometimes I work in silence. On music equipment…. How about that. Because the filters in these units are unloaded by default, they are very sensitive to load (and source) impedance. A higher than nominal load impedance will allow the LC filters to resonate and thus gives a peaky response to the second order filter, indicating an underdamped system. The resonance control is accomplished by loading the filter output with a potentiometer plus a minimum load resistance in series. 10k audio taper for the potentiometer, 510R for the resistor work well to provide a nice, consistent range with useable extremes.

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