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Topics - Avenger

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1
Vacuum Tube Tesla Coils (VTTC) / 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 The project was originally made to a demonstration HV generator at my university (where I work).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:

2
Vacuum Tube Tesla Coils (VTTC) / "LightningStorm" VTTC project
« on: August 23, 2018, 02:04:56 AM »
Hello all! This is my last VTTC project. This project started 3 years ago, and now finally assemble of generator unit case is started.
The objective of the project - to build a powerful vacuum tube Tesla coil on the basis of soviet metal-glass high-power air-cooled tetrode GU-39B-1. This tube is capable to dissipate at the plate power around 6kW. And its output power is 13kW.
It was made the plate and filament transformers. The filament transformer provides 6,6V and 100A. Plate transformer is wound on the base of the output transformer of the high power tube audio amplifier UPV-1,25 (russian УПВ-1,25) used two GU-81M tube in push-pull output stage. Its core is made up of steel plates of thickness 0.35 mm (core sectional area of 49cm^2). It provides voltage 5kV and 2A peak сurrent (nominally 1,5А)
In the power supply used level shifter with eight 1uF 16KV capacitors and homemade diode pack at 50kV and 3a. All ceramic capacitors in circuit - soviet K15U-1 or K15U-2 type.
The tube installed in a steel cylinder with polyamide insulator at the bottom. Centrifugal fan "bahcivan aorb" (BRDS 180-60, 1200 m³/h) is used to cool the tube. Tube operates in triode.
The secondary winding contains 800 turns of 1mm copper wire on 160x800mm PVC pipe. Epoxy coating. 20x5cm (now is 30x10cm) aluminium toroid is installed.
The primary is a 35 turns of 4mm copper wire on 250x500mm PVC pipe. Taps on each turn, starting with the 28th turn. Winding height is 28cm. MMC capacity is 2nF (4x470pf).
Feedback winding has 14 turns of 1.5mm copper wire (taps of the first 5 turns). Located above the primary winding. Grid leak circuit is 200 Ohm and 14nF.
Tesla Coil working in staccato mode. In the cathode circuit installed triac, which is controlled by circuit in 555 timers (based of the staccato cotroller of Steve Ward).
At this moment VTTC gives streamers up to 1.5m length. The length of the streamers is limited to the power of the plate transformer and power mains capability (mains 230V 50Hz, current consumption up to 80A).

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