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Well, the results were decent, i know mosfets are WAAAAY more powerful and have a simpler functionality than BJTs, especially these here, but horizontal deflection transistors are (often) easy to find, i used a BUH713 and an ST2001FX that are both rated for 10 amps, these are mid-low end deflection transistors and you can (quite likely) also use mixed ones, also the driving transistors may be whatever ones that are small (fast) enough and can deliver like 3A I had this idea since some time, did a lot of LTSpice simulation (using a BU508A model (worse)) and the simulation "scared" me about transistor max speed, "storage time" was excessive, mosfets are ALSO way faster... i worked on this project for like 4 days and it worked first try but also i soon realized i needed an effective way of driving the front end transistors (the 2SD882) to apply a bunch of amps on the deflection ones, so after some attempts with dropping diodes i had an epiphany with an electrolytic capacitor and a resistor, this worked nice... i also had to study the flyback transformer i ended up toasting, using the scope and a function generator to see the resonant frequency and guess the amount of internal primary turns, this robbed me a lot of time... now the project has been dismantled and i don't plan to use it again at the moment, also bcs the studies i did on the black flyback are too boring to do on another one, also winding so many turns of wire externally on the core is not ....... ERGONOMIC!! LOL... also i couldn't use an inductance meter on the primary because the presence of the secondary (and it's stray capacitances) messes with the reading and it always shows 0 microhenries I initially wanted to power it with like 150Vdc to use the high voltage transistors for their maximum and it can actually work at like 100Vdc when not arcing, but a bunch of interdependent factors settled me with like a max of 60Vdc at like 5A under load If you want to replicate this project you are (of course) free to do so and i wish you to do better than this, especially using an higher frequency and\or with more efficiency, anyways the transistors usually don't heat up almost at all in my case, just when you push it in driving voltage it may stutter when arcing, sign that the system is not turning off the transistors properly (because of a spiked VCEon) and they tend to stay closed (and heat up) The flyback would have probably popped even if immersed in oil, it didn't become too hot and it wasn't a problem due to an excessive voltage, it was current somewhere Thanks for your time watching and reading this