6550 / 6550A / KT-88

This is the highly regarded SED 6550C. These current production tubes are constructed with a gold-plated molybdenum alloy grid and carbon-coated screen grid. All ratings of the SED 6550C meet or exceed those of the original version.

This is the highly regarded SED KT88 power tube. These current production tubes are constructed with a gold-plated molybdenum alloy grid and carbon-coated screen grid. All ratings of the SED KT88 meet or exceed those of the original version.

This is the legendary vintage 6550A power tube. These tubes are tested on our AT1000 at 500v on the plate! So these results are far more accurate than those done on vintage testers (typically about 150v).