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I'm not experienced in worling with vacuum tubes, but I've gotten into it since I've been making regular trips to Nortex Electronics in Benbrook (south Ft. Worth) Tx. If any of yall ever get the chance, it's an experience like no other.
Anyhow, I purchased an 811 tube which I was going to use to drive a flyback, which I was further planning on using to drive a tesla coil. I was under some kind of illusion that this would make it better somehow or that I would be able to audio modulate it easily. I've since discovered that none of this is easy, and it's especially difficult to audio modulate with vacuum tubes (you have to employ some kind of semiconductor without cutting off the RF, yada yada).
And so I said "forget the audio mod, I'll just build a coil around this 811 tube." One of the most straightforeward schematics I found was this:
it's an easy diagram, lists parts, so I did it. And I got this:
with just a few modifications to the circuit:
I omitted the choke, because it said it wasn't nessicary, and I had to kind of fudge a few values here and there, othing too life threatening, right? I used .015mf instead of .02mf for c2, .0008mf instead of .001mf for c1, and the one thing which I believe to be the real problem, I used 26 instead of 28 gauge wire on 3 inch diameter PVC. Since 3.5 inch PVC is a non standard size and all and thus unattainable, for me.
I also, as you can see from the pic, wound the primary right over the secondary, 32 turns, like it said. But it said in the instructions that he had itt to where you could change the inductive coupling.
At this point, I don't know what to do, and it won't even make any RF.
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A problem with my 811 VTTC
