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Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
Ok, It looks like I have just organised a pair of 811A Vacuum tubes. I have been lurking on HV sites for years, and although I am building a DRSSTC at the same time, I have always wanted a VTTC, there is just something so nice and almost pure about them. Now once again, Mr Ward comes to the rescue. http://stevehv.4hv.org/VTTC1.htm
Now does anyone have any hints/tips etc on this? I'm pretty confident with the whole thing, so this is just asking for anything non obvious. Also steve says that the output could have been improved, how? by how much? and to what detriment on reliability?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
You could try emailing John Freau (search GOOGLE for his email address). The circuit Steve Ward is using for his dual 811A is John Freau's original circuit, so if you email John, he might have some additional insight to what could be improved etc...
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I should point out my 811a coil just for the heck of it... Running at ~1.5mhz and a .65nf tank cap I could use a single 811a tube at 2kv or a pair at 4kv no interupter (yes, 811a'a can hange much more than 2kv)
Adding a sttataco (interupter) woud increase streamer length...
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
VTTCs require much tweaking unless you just follow a design that works already. If its your first VTTC, i would suggest just picking a set of design parameters and sticking with them until it works properly. As to getting longer sparks, you might just want to try a lower tank impedance (that is, larger C and less primary L).
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
This is going to be my "display" coil that sits in the corner of the loungeroom looking pretty. I'll probably go with the tried and true duall 811a like stated but with a staccatto controller also. To be honest, spark length isn't really that essential with this coil, but reliability is. And the fact that is has to be "purdy"
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
"Gee, You got a purdy coil boy!" lol chris, you have easily got the nicest and most professional looking coils I have seen. Outstanding, and feel free to use Purdy, it came from your side of the pond anyway, not mine!
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
I have read up on shunts, and see that they are used to either bypass a portion of a circuit in the event of a failure, or to "bleed" off some of the power to be used elsewhere. Now am I correct in thinking that they are the "shims" near the secondary winding of my MOT? Do they feed the tiny red winding on the MOT, or are they for something totally different? I notice that most VTTC's have these removed. How does this affect the MOT (If at all)?
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First VTTC!
