This tube tesla coil was built inside a CPU power supply unit. It was first built on a workbench using components and jumpers for connections. The tube used is a 4X150 transmitting tube that used forced air cooling. An old oscilloscope transformer was used for the power supply, providing about 1kV for high voltage and 6. 3VAC for the filament suppl
y. I experimented and played around with the circuit and came to this strange design that has no capacitors. Below is the schematic diagram.