I got in EBay a cheap part of a defect Speedy. The transformer was not in and he is not working. So I got a transformer from my Trash box and a 5V Switching power supply and repaired it. You must adjust the 5V switching power supply up to 6V.
It works now again and brings about 80 Watts with 5 Watts in.
The tube is a 6KD6. A 6JS6 or 6JM6 will work too.
Here is the inside view of my repairs
Here you can download the Schematics: cte_speedy_rf100_sch
Any difference between the 6kd6 tube or a 6JS6 or 6JM6 ? Its for my speedy because the 6kd6 is hard to get nowadays 🙁