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Re: [TCML] First VTTC - Some help needed choosing tubes

Has anyone ever heard about either repairing a damaged tube or even
building one from scratch?
Seems like it may not be that difficult given that for coil use you have
specific capabilities needed compared to the broad use that these tubes
were intended for. How good of a vacuum is needed? Are they, can they be
gas filled?

On Dec 27, 2018 10:06 AM, "Chris Reeland" <chrisreeland@xxxxxxxxx> wrote:

> Hi Matt,
> Just about any power grid tube can be used in a VTTC. I have seen a big
> list or two on here in the past of examples of what was used/tried. And
> they were far from being complete. And there are all kinds of tubes from
> Europe and Russia and Asia that can be used.
> I am familiar with a few you have listed. Not familiar with others. Again
> there are just so many out there.
> I see the ones that I am familiar with, are smaller tubes, since you are on
> a budget also. And you are planning on a small MOT. Possibly "doubler".
> Quick question, are you planning at all to interrupt (pulse) this coil at
> all?  If you are NOT going to pulse, I would strongly suggest (some may
> disagree with me) to pass on the "doubler", especially since this is your
> first VTTC. It can be done, but it will be much harder to tune in overall.
> In my opinion a "doubler" must be pulsed.
> Again just my two cents on this...
> I also want to say the secondary you are planning on is really big
> physically for especially using small tubes and a small MOT.
> 3"dia. by, oh maybe, 12"-14" would be the largest maybe. Still kind of big
> in my opinion.
> The current coil that I am discussing a lot here is a secondary of just 2"
> by 13.75" of #28 wire that is having very good performance.
> You are free to try anything you want, but you don't want to have this too
> large.
> Steve Ward mentions this if I remember correctly also. There is a lot of
> variables in making and designing a VTTC. Definitely read Steve's info
> several times over and over. You probably have already done so, but look at
> the VTTC's he has built and the details he has given on each one, they are
> pretty good, but there is also some methods that he uses in his coils that
> I don't agree with. I guess you can say we all have our different
> methods/opinions on some things.
> Just a word of caution on vacuum tubes and buying them since you are new at
> this. There are many things that can be possibly bad with a tube, even if
> they look like they have never been used. Most sellers have no way of
> testing them. The ones that do and stand behind them, you will usually pay
> more. You can never be sure of a history of a tube also on these old tubes.
> Some sellers can be semi dishonest unfortunately. Then there are the poor
> packers, so you received a shipping damaged one. And there are many other
> things possible.... with an old tube.
> Please don't let this discourage you. There are honest sellers also and it
> also just really takes some luck.
> I have been pretty lucky on a lot of tubes over the years, but I also have
> an ever growing collection of "duds". It happens, but it is worth it in the
> end to actually use tubes in something as they were meant to be...
> I will make some more comments probably tomorrow, I still need to take a
> better look at the tubes that I am not familiar with that you listed and I
> need to reread what you all posted here.  I am currently tired after work
> and it is late(early morning actually)now. Sleep is calling... Others
> should chime in shortly also...
> Chris Reeland
> Ladd Illinois USA
> Sent from my LG V20
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