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Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
After I built my dual 811A vttc, I decided I would attempt something a bit larger. I ordered an 833C tube for this project, and two 833A's (for my final vttc project) I will used a rewound MOT for the filaments, and an mot with voltage doubler for the plate supply. Anyway, this project has been coming along nicely. I'll finish a lot on this coil tonight.
I'll update with some pics once I completely finish the coil.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
This coil is now finished and making sparks!!!
I am currently running this coil without a stacatto controller and with a very small tank cap (physically small) so I've only made it up to 85 volts input. Running anything past that will make the plate red on the 833C and probably heat up that small tank cap. I plan on getting a stacatto controller up and running soon, so this coil will eventually be totally complete.
With no stacatto and just 85 VAC input the coil is still pretty spectacular. I'm probably getting around 18 inches at 85V input, so with stacatto, I'm sure I'll get up around 24 or 25 inches.
I have a question that has been on my mind. How does the RL circuit kill very high frequency oscillations that can be set up if internal arcing occurs.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
SteveC wrote ...
I have a question that has been on my mind. How does the RL circuit kill very high frequency oscillations that can be set up if internal arcing occurs.
I always thought this network was to prevent parasitic oscillations. These have nothing to do with internal arcing: they're caused by the stray inductances and capacitances of your wiring, which form an extra unwanted "tank circuit" resonating in the 100s of MHz. The tube drives this circuit into oscillation in just the same way as it does the regular tank circuit.
The RL network adds extra lossy inductance to the parasitic tank circuit, which damps it so much that it won't oscillate any more.
It doesn't affect the wanted mode of oscillation, because it's not inside the regular tank circuit, and even if it was, its inductance is negligible compared to the primary coil.
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single 833C VTTC
