WTB VT Tesla coil Service.

Hello friends!

I wasn't sure where I should place this thread or if this is even allowed here and if not I'm sorry.

Anyway as of last year I did a massive trade for a TON of electronics hear all of which HV related. And included in that trade was pretty much everything I need to build a MASSIVE VTTC.

http://i.imgur.com/EPajL.jpg

So what I'm asking is for someone to basically put this thing together for me. Why? Well because I'm not really capable of doing it myself as I'm not THAT electronically inclined.

What I would need you to do is basically design the circuitry with the parts I include and either put it together for me or make an easy diagram that I could follow and ill put it together myself. I understand that there's alot involved in this and that's why I'm calling this a service. I'm also willing to pay you for your time and any parts that may be missing and or needed to finish this.


If you have any questions about the project please don't hesitate to ask. I will discuss payment with you VIA PM.

Thanks for your time.
Jeff

Re: WTB VTTC Service.

Shoot Le Quack a PM

Laser Pointer Forums - Discuss Lasers & Laser Pointers - View Profile: Le Quack

Re: WTB VTTC Service.

While I fully support Jared's endeavors and services I feel obligated to point out he has no experience in the area of Tesla Coils. I'm quite sure he could do it if put to the task, but don't expect him to jump on it or have it pre-planned out in his head the moment you ask him.

That being said I am not in a position to build something like this for someone else -just yet. I have not built a VTTC yet, and I've only built 3 Tesla Coils so far. I can relay some basic and intermediate level information as well as tons of web resources for you though if you wish to do it yourself; including schematics, guides, examples done by experts, and relay my experiences in making one of the main parts... the Tesla Resonator.

If you decide you wish to purchase a pre-wound resonator, I may be making some for sale in the coming weeks if my job interview on friday goes well. My prices will be less than half that of the only two other sources.

In the mean time, you need to make a decision on what type of VTTC you want; interrupted (Staccato) or CW. You also need to provide what the name of the tube is, it will be essential information, and also state what (if any) power supplies you have at your disposal (a MOT counts). You need two power supplies for a VTTC; one high voltage for the tube and one low voltage but high current for the filament.

Re: WTB VTTC Service.

^ Thanks for the info guys. Anyway, I'm not going to pm people for this service because its going to require ALOT of work really. I'd rather have someone come forward willingly.

I suppose it would be of use to list some of the things I have here. As I said though I have most of the stuff here.

I would like an interrupted VTTC in the 350khz range. I think I could wind my own primary and secondary all though this could be discussed as I don't have an oscilloscope to know if I am achieving true resonance.

The tube is a 4-1000A. Similar to this one if not exactly the same? Eimac 4-1000a 8166 Tube - Pulled/ Used - Tested Works Well | eBay

The power supplies I DO have are MOT's. But I think the filiment is going to be powered by MOSFET's. The person gave me some ferrite cores and some really BIG iron C shaped things that I think are for the heater. (Again I'm still very new to electronics in general.) I'm going to have to go over my parts on a 1 to 1 basis with the individual (if anyone) who steps forward.

Anyway as some of you can tell I'm nowhere near ready to. "build" a VTTC which is why I need someone else to do it.

Re: WTB VTTC Service.

Well, having someone else build you the coil won't let you learn anything about how it works, will it?

There's actually a few ways to figure out how close you are to resonance without a scope. You use an LED specifically to figure out how close you are to resonance. With parallel resonance, the LED will be at its dimmest when at resonance. When in series resonance, it will be at its brightest.

VTTC's are great, because tubes handle abuse a lot better than semiconductors do. A half wave rectified MOT ought to work fine for the tube's B+ supply. As for the filament; those two big C iron cores? He might have included a bobbin or something with them, with wire on it right? (I know the person you traded with in ...person, so yeah, a lot of that stuff looks familiar )

If he did, you should be able to wind your own filament transformer. With the standard primary, I think it's 0.6-0.8 volts per secondary winding?

If he didn't give you a bobbin, then the cores are kind of useless...

You could probably use ANOTHER mot with 4-5 windings on the secondary too, but it'd be heavier, and hotter too.

In regards to the tank capacitor, I don't think you're going to be able to get by with only 4 of those white ones... you need some beefy caps for it to be able to stand VTTC power... and I don't see any other "viable" capacitors in your picture.

That tube thing in the back, the one that isn't the 4-1000A; is a photomultiplier tube in case you were wondering by the way.

As for actually building a VTTC, or any Tesla coil at all... I haven't. I'm working on winding a secondary, day after day, so I hope to change that soon enough.

You could, alternatively build a vacuum tube induction heater too. That tube is definitely beefy enough that it could handle it.

Problem is finding a HV supply, and HV caps that can handle a great amount of current...

Re: WTB VTTC Service.

Cores are far from useless without a bobbin; all you really need is a cardboard one or a PVC pipe. BTW, those cores are designed for 0.5V per turn, so place 240T on one side as the primary and 14T on the other to power the tube's heater.

To run the tube at 1000W you will need that fan, and the heatsink must go atop the anode nub. Connections to the posts should be made with some sort of clip or tube; no solder. The fan should blow through the holes on the bottom.

Two MOTs in series will supply the voltage needed; just connect the cores together and power one phase-reversed.

GOOGLE:

Armstrong Oscillator
Hartley Oscillator
Colpitts Oscillator
Inductance
Capacitance
LC Resonance

Re: WTB VTTC Service.

Bumping this one last time.

Re: WTB VTTC Service.

Oh i have an AWA transmitter that uses 4-1000A's i recognized the tube straight away!
I do have spare tubes for it though, sorry.

Re: WTB VTTC Service.

AUS said:

Oh i have an AWA transmitter that uses 4-1000A's i recognized the tube straight away!
I do have spare tubes for it though, sorry.

Click to expand...

I don't know much about radio stuff haha. I also dont understand the last sentance you posted. I assume you mean "don't"?

I updated the title to hopefully attract more attention.

Re: WTB VTTC Service.

jeffreythe00 said:

I don't know much about radio stuff haha. I also dont understand the last sentance you posted. I assume you mean "don't"?

I updated the title to hopefully attract more attention.

Click to expand...

Sorry, thought you were selling all that stuff and meant I don't need another 4-1000A tube.

I have plenty of experience with vacuum tubes in radio transmitters bit not tesla coils so I can't really help you. There are a few VTTC circuits on the net though

Go here: http://4hv.org

Some of the most intelligent men I know are on there regularly. Grenadier knows who I'm talking about.

Meatball said:

Go here: http://4hv.org

Some of the most intelligent men I know are on there regularly. Grenadier knows who I'm talking about.

Click to expand...

Hey thanks meatball! I am already a member there. Lots of cool stuff there. Some of wish I could never own/make in a lifetime.

However I'm not sure if I want to post there. The reason is I am afraid people will think I'm just some NOOB who will most likely hurt himself. I don't like criticism very much. I'm also not very electronics savy so it would only confirm people's suspicions.

However I MAY give it a go. I dunno. I'll have to see. Really all in all I've looked at the diagrams you people posted here and I THINK I could pull it off. The thing is if something goes wrong its probably going to go HORRIBLY wrong. So I'd rather see someone who has had experience with this sort of stuff do it for me. 1kW is ALOT of power to have and if something dies. Its probably going to explode into a huge fiery mess. Can't have that happen. I would be living on the street as my parents would kick me out LOL.

I've always wanted a TC and this would really be a dream come true if someone could help me.

VTTCs aren't terribly hard to build. Of all the TC variants they're probably the most robust next to your ca 1890s SGTC. The only reason I haven't built one yet is when I added up how much all the parts would be (flat buss conductors, anode heatsinks, tubes, tube bases, mica caps, high power resistors, etc) I found the price to be within close range of a high end SSTC. I have a preference to modern analog electronics (but not digital stuff =P ) so it won out. I would like to make a single 811A VTTC in the future though, something with REALLY high Fres.. like 5MHz or so. One nice aspect of VTTCs is the low parts count. I have a SSTC I'm building and the parts are literally in the multiple dozens. I haven't done an official count yet... but >36 parts come to mind easily and that isn't including any of the physical support or resonator stuff.

If you post on 4HV do so asking for construction pointers (any non obvious pit-falls or speed bumps to watch out for) and links on where to go to find the information you need to do it right. DO NOT just ask how to do something, they have a strict policy against asking/telling someone how to make something step by step like we do so often here. They're pretty nice folk and if you stay within their rules and explain to them where you are coming from, they'll be more likely to help you out. If you have any experience with HV it is good to post that you do, so they don't think you're going to kill yourself or someone else. If you don't have experience with HV, feel free to ask questions on here, there are a whole bunch of us HV guys here on LPF.