You can test the 350B as a 6L6 type, they are practically interchangeable except for the value $$$.
The 101- series is a simple low-mu triode, you can run it as a 2A3 and get an idea about it.
The UY type base on them used a bottom contact rather than a side contact as on the UX base, so it will rattle around in your socket and you may need to go to clip leads to set it up.
dg