Firstly, this site was not intended to introduce you to the scientist and inventor by the name of Nikola Tesla (pictured left), so I have not bothered to add an introduction to him, if you want to find out more about this great man, try a web search on his … Continue reading…
This will be my third coil, if I ever get it working ! As before with the Vacuum Tube Tesla coil, this project uses a very large radio transmitter valve in place of the spark gap in the standard coil. This time I am trying to drive it with a … Continue reading…
The GU-81M Tube. The picture is deceiving, it measures 260mm tall and weighs in at 1kg ! It’s original use was for Russian military radio transmitters, 700w of pure high frequency electrical mayhem ! It’s the same unit I used in my first VTTC.
The components to the left of C5 form the oscillator circuit, C5 is the coupling capacitor and the mid-section is the power amplifier stage. The output of the oscillator is around 100v p-p and a sort of rough sine-wave. The main tube needs around 300v p-p though and the power … Continue reading…
K1 / K2 – Microwave oven transformers, 2100v output. K3 – Mid power supply transformer for Oscillator, grid bias and small tube heaters. K4 – 12.6v 10A Filament transformer for output tube. C1 / C2 / C3 – Microwave oven capacitors. D1 / D2 – Microwave oven diodes. C4 / … Continue reading…
The oscillator and pre-amp unit nearing completion. The small valve is the 12AU7 twin triode used as an oscillator and the other is the EL34 pentode used for the power amp. The controls on the front are for frequency and output level, on the rear is the bias control for … Continue reading…