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Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Hi I slowly building a new VTTC when I find some hours to spend. The project is slow enough so i decided to upload the construction pics as some stages are ready.
MOJNOST - multumesc pentru lampa!!
The power stage (MOT, multiplier, filter caps). I am using some wood plates (used for cuting vegetables..not for tesla coil use), they are very small or incredible large, so I bought some small ones and have to bulk everything in small space. I added some more turns on the fillament transformer, for the right voltage under load (the power is overrated so I will not have current troubles).
The next stage contains the tube and the grid network with some beefy coolers for the tube.
The stages came out very nice together:
The power stage:
..and the tube:
Now, I have to make some coils. I didn't have enough magnet wire, so the secondary has some bumps on it, but with some more protection it will be ok.
The pics will be uploaded as the project is going.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Dr. Spark wrote ...
One little suggestion, you may want to raise the Plexy ½ inch up above the MOT, as the heat will try to radiate from the top on the MOT and a little air space between the MOT and Plexy will sure help.
yeah, I would point one of the fans on the MOT instead They can run VERY hot and it's perfectly fine, most are rated at 180 or 200C maximum temperature. I'm sure you wouldn't want to see your nice work melt down, would you
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
OK, added some wood spacers.
I will use some impedance matching (autotransformer primary type), so I hope that the MOT will not be so hot. But a safety precaution more is always wanted.
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
The HV transformer will be fed through a variac (externally). Ading a variac in the already built setup would give discal disturbances, heh. The fillament, anode and coolers will be powered separately through mains power cords. I prefer this way, the space is too small. I put some switches directly on the cords.
GU-81 The most accesible tube in this part of the world.
Indeed Maaaan this is a sweeeeet tube. I have 5 or 6 of those and we (with a friend - ham) have built a 80m to 20m amplyfyer, wich easuly takes out 1kW of power in the antenna when we want to be naughty
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Tube coil project
They can run VERY hot and it's perfectly fine, most are rated at 180 or 200C maximum temperature. I'm sure you wouldn't want to see your nice work melt down, would you 
Maaaan this is a sweeeeet tube. I have 5 or 6 of those and we (with a friend - ham) have built a 80m to 20m amplyfyer, wich easuly takes out 1kW of power in the antenna when we want to be naughty