RE: KR-10 Tube specs? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 23 Dec 2006 20:31:48 -0500
From: Chris Boden <cboden@xxxxxxxxxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: KR-10 Tube specs? (fwd)

We use X-Ray transformers as part of several of our demos and projects.
Since X-Ray tubes work on DC the XRT units have internal rectification
setups. Modern ones are solid state and use diode stacks of various types,
older ones use a pair of tubes. The tubes we've come across are KR-10's and
just today in shooting a video on "what's inside an XRT" we pulled a pair of
KR-9's.

In order to make the transformers more useful in the lab, we "neuter" them
by opening them up and removing everything that doesn't need to be there.
Then we splice the secondary of the main transformer to the main HV output
leads. For those that haven't been up-close and personal with an XRT they
tend to have over a dozen connections and often as many as 4 or more (I've
seen far more on a couple) separate transformers inside. These transformers
feed things like filaments for the rectification tubes, the filament of the
X-Ray tube itself, etc. They also usually have some manner of switchgear
inside which can be anything from a simple solenoid to a motor driven wiper
unit. The one we took apart today looks not unlike a miniature version of
the SRSG for Big Bill's 13M coil.

Many of the toys we have in the lab require HVDC. So, to make things visible
and presentable (you can't see much through a steel XRT case, even if it has
a window (some of ours do)), we came up with the novel concept of a High
Voltage Aquarium. Construction is similar to a HV transformer where
everything is hung from the bottom of the lid, and the container is simply
filled with oil.

This allows us to only have to move something holding 10 or so gallons of
oil. The oil is transparent and allows for the device to be used for
demonstration (backlit, the crowd can see inside easily) or experimentation
(if something burns, blows, or bakes you can easily see it) with a small,
portable, and configurable package. It takes a half hour of dinking around
to remove the cover from an XRT (there's several dozen screws and a forklift
involved), whereas with the aquarium system, you just grab a pair of
terminals and gently lift it out.

I've built several HV devices out of aquariums over the years for use in the
lab. Here's photos of a couple full-wave-bridge rectifiers I built, one in
2004 and one just a month ago.

http://www.thegeekgroup.org/archives/img/thumbnails.php?album=11

I'll do a hot-to video on how to make one soon. We're about to shoot a new
batch of videos for the 2007 iteration of the website. This is an area we've
never touched on before in the videos, it'll be fun to do a few HV Under
Glass projects :) I'll built a rectifier and some switchgear and shoot some
videos for you guys.

I'd build a tube one if someone would be kind enough to post the specs on
these tubes for me ;) I need to know about the nearly identical KR-9 as well
as the KR-10.

Guys?


Chris Böden 
President
The Geek Group / Applied Intellect
www.thegeekgroup.org
Because the Geek shall inherit the Earth!

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Saturday, December 23, 2006 19:09
To: tesla@xxxxxxxxxx
Subject: Re: KR-10 Tube specs? (fwd)

Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 23 Dec 2006 12:20:31 -0800
From: Ed Phillips <evp@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: KR-10 Tube specs? (fwd)

I have a couple of these and would like to make an aquarium demo
rectifier. "

	That's a new one to me.  What is it?

Ed