Re: Tube Question - Tube Database

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

Thanks. I have access to almost all of the below, but
the tube is no good. I was washing away the decades of
dust, when I heard a faint rattling. As I tilted it
from side to side, a small piece of wire emerged. Then
another, and another. I'm guessing it is part of the
grid, which is coming apart, or perhaps part of the
filament supports. I've torn apart smaller tubes in
the '60's and 70's, but never anything this large.

Too bad. It looked promising from the spec sheet.

I did manage to get a Wattmeter, an old VON hipot test
set, a VON 6.25 cm shere gap voltmeter, a vacuum
variable capacitor, etc. all for free, so it wasn't a
total loss. I'm going back, so maybe they have another
one.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Sparktron01@xxxxxxxxxxx
>
> Adam and all Vacuum Tube Tesla Coil enthusiasts.
>
> The best on line database I've found for virtually
> every tube manufactured is:
>
> http://datasheets.electron-tube.net/index.html
>
>  >From this database, below is pdf file for a
> Machlett
> Laboratories ML-6420.
>
>
http://datasheets.electron-tube.net/sheets/026/6/6420.pdf
>
> It is a very high power industrial triode, designed
> for
> Induction Heating and MF broadcast applications
> (30Mhz).
> Water cooled variant can handle up to 20kW input.
> This would make an awesome VTTC with the following
> caveats...
>
> 1.  Is the tube a good tube (obviously)?
> 2.  What kind of service life has it been subjected?
> 3.  Does it show evidence of abuse (overheating,
>       external arcing)?
> 4.  Do you have access to a spare?
>
>        Building a really  large VTTC without  a
> spare
>        tube is like building a high performance drag
>        racer or hot rod without  a spare engine
>        (i.e. pointless).  Infrastructure costs will
> be
>        LARGE.
> 5.  Do you have access to filament transformer
>      (7.0V, 85A), and HVPS up to 10kV@2-5A?
> 5.  Do you have HV tank capacitor rated at 25kV
>        to 50A rms CW) and power resistors (50 ohm,
>        1, 2kohm  @ 1kW)?
> 7.  Do you have experience (personally!) working on
>        Industrial HV  high power equipment (lasers,
>       bradcast transmitters, medium voltage
>       switchgear,  etc.)?
>
>        A machine of this magnitude is very
> dangerous,
>       even for qualified technical personnel.
> 8.  Do you have the appropriate liquid cooling
> hardware
>       (heat exchanger/fans, ground current leak
> detectors,
>       pumps w/ hardware, etc.)?
>
> Not trying to discourage your attempts, but making
> you aware of challenges, and hazards that which
> you will contending.
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA. USA
>
>
>   -------------- Original message
> ----------------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>  > Original poster: Yurtle Turtle
> <yurtle_t@xxxxxxxxx>
>  >
>  > I've never been interested in VTTC's, but I just
> found
>  > a Machlett ML 6420 tube, complete with water
> jacket,
>  > for free. Would this be suitable for a VTTC?
>  >
>  > I also found another tube that appears to be a
> 5000
>  > volt 10-750 MMFD variable capacitor. It's
> lableled
>  > UCSLPS-750, though most other markings have worn
> off.
>  > I couldn't find much Googling for it. Does this
> have
>  > any possible use? The fellow who left all this
> good
>  > stuff behind had a plasma tweeter that used one
> of
>  > these.
>  >
>  > thanks
>  > Adam
>  >
>  >
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