Re: 811 tube coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "R. Bergmann by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bergmann_-at-hotmail-dot-com>

Put a "not so wimpy tube" in.  Go for a 572b.


Ryan






>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: 811 tube coil
>Date: Tue, 02 Jul 2002 07:13:36 -0600
>
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><FutureT-at-aol-dot-com>
>
>In a message dated 7/1/02 7:08:04 PM Eastern Daylight Time, 
>tesla-at-pupman-dot-com
>writes:
>
>Steve,
>
>If the tube plate is not red, then it's probably running within safe 
>current
>limits.  A barely perceptible red color is acceptable for intermittent use.
>811A's are rather wimpy tubes, so you'll never get very long sparks,
>although I think some folks get a little more than 2.75".  It may help
>to sharpen the breakout point to a very sharp point to help the coil
>to break out.  Some doorknob caps are very good, others are very
>bad.  You'd have to have the correct type.  An MMC cap should be
>OK, since many folks have used them with good results in tube coils.
>It sounds like your tuning is OK, but it's difficult for me to be sure
>from here.
>
>Cheers,
>John
>
>
> >
> > Hi,
> >
> > I have a question that somewhat relates to the post but just a general
> > question about operation.  Sometimes when tuning, i cannot get any 
>sparks to
> > breakout, unless i bring a screwdriver very close.  When this happens, 
>the
> > Amp meter says its pulling 6A which means that the tube is running at 
>its
> > max.  Is this dangerous to the tube?  I try to prevent this as much as i 
>can
> > but it seemed to happen alot today.  Also a very opposite situation is 
>that
> > ive managed(or so i think) to achieve the best tuning with my tuning 
>cap.  I
> > get current draw of less than 3A, and i get a good 2.75" arc.  Does this
> > sound like im getting close to having the best tuning with my current 
>cap?
> > Im also wondering about my cap, it gets very warm(actually hot).  Its a
> > small MMC of poly caps.  Total for the bank is 900pf at 8kv.  Im 
>supposed to
> > have a 1000pf cap at 10kv, its also supposed to be doorknob type.  Would 
>a
> > doorknob really work any better?  If so, where could i get one.  I want 
>one
> > of the best caps i can get(for cheap) because my performance seems to be
> > highly relying upon this cap.
> >
> > Steve Ward.
> >







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