A hybridizer gave me a piece of Tet Janice Brown about a thousand years ago. He was not sure it "was still a Tet" because it was now "unstable" and may have "reverted to a dip" This hybridizer did his own conversions and I never knew him to sell one to anyone.
I really do not know the fine points of this - as I have never used many conversions. I have worked in some dip spiders, but mostly with straight Tets.
A few years back, John Rice showed me with his microscope how he was testing to see if his conversions worked by looking at the pollen, and measuring it's size.
I do have a stable Tet Conversion of Holly Dancer. It will set pods, but boy, it's not easy. I think it is fairly common to have difficulty setting pods ON a Tet Conversion.
I better let someone else with more experience chime in here. I don't want to give you bad information.