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Unwanted low-level electronic interference from my recording signal path

Hello there,

When I start my computer and activate my DAW I find that I have a constant low-level electronic noise coming through my monitor speakers. It begins the minute that I plugin my digital interface which is a Scarlett 18i6.

Audio-Technica AT2035 Problem

I bought an Audio technica at2035 and attempted to use it on my computer. I have a usb XRL cable and I set it as the default audio recording device on my computer. However, whenever I try to record my voice in Audacity nothing happens. I have tried a headset microphone and once I select that as my default audio device it record just fine so it isn't my computer.

Vocal Test with an AKG SolidTube

Forums

I recently replaced the stock 12AX7 tube in this mic to a 12AT7. The original reason I changed the tube wasn't to get a tonal difference, it was just that the old tube was causing noise, and the only spare tube I had lying around was a 12AT... but I think it did change the tonal characteristics of the mic, not dramatically, but a bit.