I have a pair of GE 6550s for sale.
I have owned these NOS NIB tubes for ten years and need to part with them. These are a closely matched pair from a large lot of these. I bought these originally for a SE pair of mono blocs that I never got around to building.
These are a great KT-88 replacement in SE HIFI equipment.
These would also work great in a bass guitar amplifier like a vintage Ampeg or Sunn.
They are the "white box" JAN version.
I am asking $175 for the matched pair (OBRO). Two weeks 100% full return if the tubes are not as described.