Q: How often should I replace the tubes in my studio’s tube microphone preamp, tube compressor, and tube microphones?
A: According to the tube experts at Universal Audio, tubes need to be replaced when they go bad. The trick is to identify when the tubes are bad, given that “failure” can happen over an extended period of time and use. In some cases, a tube will just suddenly stop working completely. But more often, the deterioration is gradual and may be difficult to notice. Look for these symptoms:
- Microphonics (whistling or other other noises)
- Reduced gain or volume
- Diminished bottom end
- Thinner sound
- Loss of high frequencies
- Uncharacteristic distortion
- Intermittent pops or crackling
