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Tube Troubleshooting and Replacement

repair service warranty tube broken replace

Q: Is Biasing covered under warranty?
A: Typically not. It should be considered as part of the routine maintenance in keeping your amplifier at its peak performance. However, if re-biasing is required as part of other warranty service, it will be covered under the warranty policy.

Q: My tubes are not working (i.e. not lighting up, no output, etc).
A: Check the following:

  • Make sure the tube is firmly seated in the tube socket
Other tube situations:
  • My tubes make a popping sound accompanied by intermittent light from tubes - the tube is failing and needs to be replaced.
  • The appearance of “white frost” inside the tube – the tube has cracked and it must be replaced.
General Guideline for Replacing Tubes· Always replace power amp tubes with matched set(s) every 12-24 months depending on the amount of use, and have the bias checked and/ or adjusted by an Authorized Line 6 Service Center.
  • Preamp tubes (such as the two 12AX7s) only need to be replaced when they are microphonic (ringing sound from tubes when tapped), noisy, or damaged.



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