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Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
I've made some progress with this thing. As you might remember it uses an Amperex YD1150A triode which is kind of an overkill for a VTTC this size. I have a cooling fan on it now so I can really throw the power to it ! I get lots of corona around the wine bottle capacitors at high power.
Here are some specs..
secondary coil , 3.5 inch x 12 inch wound with 28 gauge magnet wire primary coil, 6.5 inch wound with 30 turns 10 gauge wire taped at 30th turn primary capacitor 2.75 nf wine bottle capacitor bank tickler coil , 28 turns grid leak resistor, 2500 ohms grid capacitor , 1nf
Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
Just thought I would bring you up to date on my progress.
1- I redid my primary coil to give it more turns and I put the tickler coil on top. 2- I've cut back to just two wine bottle capacitors and have refined the coupling and tuning. 3- I finished up the cooling unit for the tube.
I'm getting about 20" sparks now and Hank has offered to give me some ceramic capacitors to replace the wine bottle capacitors which might improve the performance even more.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Great work Roger! Your coils are all very neat, and on youtube you and Teslaspigeon are the people that made me want to make a dc resonant charging tesla coil .
Looking forward to seeing the new capacitor on here, the sparks are already awesome!
Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
Thanks for all the kind words.. I have been tempted to hook up a 7.2 Kv pole pig to this thing but if I'm going to build a really big tube coil I would rather have a bigger tube. There are some 3CX2500f3 tubes on eBay right now. If I can pick up one of them cheap maybe I will do that.
I have been meaning to make some more you tube videos and now that the weather is warming up I might get time to do it.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I have been tempted to hook up a 7.2 Kv pole pig to this thing but if I'm going to build a really big tube coil I would rather have a bigger tube.
That would indeed be something to see! Now your giving me ideas with my pig... I have seen a guy with a 25kw or something vttc running from a 5kw 7 something kv pig, fullwave rectified. 3 foot sparks, as thick as his arm XD.
Registered Member #1034
Joined: Sat Sept 29 2007, 12:50PM
Location: Chillicothe, Ohio
Posts: 154
Just thought I would update everyone on my tube coil. Dr Hankenstein sent me some free ceramic capacitors to replace the wine bottle capacitors in the tank circuit. We are lucky to have such wonderful friends in the Tesla coil community. I have also gone from a YD1150A tube to a 3CX2500F3 tube. The 3CX2500F3 just loads up better in this situation. I haven't been pushing ether one of these tubes very hard. The power level is about 3500 watts with a single MOT (commercial size ) and I'm getting about 25 inch sparks. Enjoy the pictures, Roger
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Junk Box Tube Coil
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