Author Topic: G-811 (811A) Mini-VTTC  (Read 109 times)

Offline Avenger

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G-811 (811A) Mini-VTTC
« on: January 13, 2023, 02:08:12 AM »
Hi all! I'll show you one of my old (relatively) projects. Tesla coil on G-811 tube (Soviet version of the famous 811A tube). The project was originally made to a demonstration HV generator at my university (where I work). As such, this Tesla coil worked for about a month, nothing burned out or failed.
Now for the design. Power supply - 50Hz alternating current (without shifter) from a small MOT. And although even such a small tube holds voltage from the voltage shifter, the MOT heats up very quickly with it and the coil cannot be used with it for a long time. When powered simply from the MOT, the heating of something is weak, it can be operated for a long time.
Primary - 35 turns of 1.5 mm copper wire, taps from each turn, starting from 28. Primary cap - Soviet TGK (ТГК) capacitors, 470pF 6kV (two in parallel). Secondary winding - 650 turns of 0.35mm wire on a frame 7.5x23cm. The resonant frequency is about 473 kHz. There is no toroid. The terminal is just a piece of copper wire.
Gridleak - 2200pf 10kV KVI-3 (КВИ-3) and resistor 2.2kOhm 50W. Gridleak coil is 15 turns. RF bypass - two KVI-3 2200pf 10kv each. The tube socket is homemade.
The coil produces streamers about 18 cm long. Due to the power supply from just AC, the sound of operation is very quiet.











Video:
All ingenious is simple

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G-811 (811A) Mini-VTTC
« on: January 13, 2023, 02:08:12 AM »

 


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