I'm building a vacuum tube Tesla coil (VTTC,) and although I have experience in SGTC (spark gap), there are some questions left unanswered.
When picking a tube for your coil, does it matter which tube you pick, except for the voltage and current ratings? Because as far as I understand, the feedback coil's job is to make the tube turn on and off at the right time. If the tube is going to resonate anyway due to the feedback coil, the only reason why there are different coils is because of different voltage and current ratings.
When looking at more complicated VTTC circuits, there are a lot of capacitors. What is the meaning of all the extra components, compared to an SGTC, there are only 4?
This is not my Tesla coil schematic, as I havent started building it yet. As you can see, there are three capacitors as compared to a SGTC, which has only one. Do the capacitors, resistors and diode change the primary frequency or are they just there to smooth things out?