Where can I find suitable replacement tubes for Line 6 tube amplifiers?

For Line 6 tube amplifiers, the tube types suitable for the respective model are especially important. This applies in particular to the DT25 with EL84 and 12AX7 / ECC83, to the DT50 with EL34 and 12AX7 / ECC83, as well as to Spider Valve models with 6L6 and 12AX7 / ECC83. Line 6 also expressly points out for the DT models that suitable matched power tubes are important. Many of these types are also available from BTB in premium matching quality.