My recently completed 833A VTTC

MRMILSTAR, Tue Jul 17 2018, 01:21PM

This is my 833A VTTC which I completed 6 months ago. It took about 4 months to build because I wasn't in a hurry. Parts came from what I had on hand, salvaged microwave ovens, a local surplus store, dumpsters and E-Bay. The base is made from a solid 1/2 inch thick aluminum sheet which came from a salvaged HF antenna coupler. This base is extremely rigid and is also an excellent ground plane.

My goal was to have a completely self-contained unit that I could take to local schools for demonstrations. I also wanted open construction so that the parts could be seen. It weighs about 70 pounds but is still transportable. Currently my maximum spark length is 20 inches when using the interrupter. I could get more with a beefier MOT but then it would weigh even more. I incorporated a PFC capacitor to minimize the load on the 120 volt circuit breaker at schools I may visit. The PFC capacitor reduces the wall current by about 4 amps.

1531833302 62119 FT0 Vttc Front View 1

1531833333 62119 FT0 Vttc Front View 2

1531833357 62119 FT0 Vttc Rear View 1

1531833376 62119 FT0 Vttc Rear View 2

1531833392 62119 FT0 Vttc Main Instrument Panel

1531833409 62119 FT0 Vttc Filament Voltage Control

1531833428 62119 FT0 Vttc Primary Coil

1531833445 62119 FT0 Vttc Side View 1

1531833460 62119 FT0 Vttc Side View 2
Re: My recently completed 833A VTTC
Plasma, Wed Jul 18 2018, 04:02AM

Hi, fning nice work, there professional, how much money did you spend?
Re: My recently completed 833A VTTC
MRMILSTAR, Wed Jul 18 2018, 02:04PM

Plasma wrote ...

Hi, fning nice work, there professional, how much money did you spend?

Thanks for the kind words. I already had a lot of the parts from previous projects. I probably spent a total of about $500. Assuming that you could get the microwave oven parts free, I would estimate that this could be built for no more than $750 if you had to buy everything else depending on your sources.