[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: 811 tube coil
Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>
Thanks for the info John and everyone else(of course). Take a look at this
ebay seller. He has 1000pf large grey doorknobs for pretty cheap. Does
anyone know if they are any good?
Also if anyone knows where else to get Doorknobs, or some really cheap, and
SMALL MMC caps(.01uf >1kv), id like to hear from you. Oh and im at about
3.25" arcs now. I still think that this coil is pretty neat, it seems to be
>From: "Tesla list" <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>"
>In a message dated 7/1/02 7:08:04 PM Eastern Daylight Time,
>If the tube plate is not red, then it's probably running within safe
>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
> > 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
> > breakout, unless i bring a screwdriver very close. When this happens,
> > Amp meter says its pulling 6A which means that the tube is running at
> > max. Is this dangerous to the tube? I try to prevent this as much as i
> > but it seemed to happen alot today. Also a very opposite situation is
> > ive managed(or so i think) to achieve the best tuning with my tuning
> > 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
> > 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
> > have a 1000pf cap at 10kv, its also supposed to be doorknob type. Would
> > doorknob really work any better? If so, where could i get one. I want
> > of the best caps i can get(for cheap) because my performance seems to be
> > highly relying upon this cap.
> > Steve Ward.