Re: [TCML] Pre-Launch Prep Procedure

[Mike Gray <graymp89@xxxxxxxxx>]

Gary, is it easy enough to see when the luminous output of the lamps is at
a peak?


On 20 July 2013 22:16, Gary Lau <glau1024@xxxxxxxxx> wrote:

> H All,
>
> Yes the referenced lamp is the type that I used.  While I initially
> soldered connections to the bulb ends, I was concerned with the possibility
> of the lamp's heat melting the solder and coming loose.  I've since
> constructed a wooden board with some spring steel sheet metal contacts that
> press against the lamp's dimples as was intended.  An image of the dummy
> load board can be seen on page 10 of this document:
>
> https://docs.google.com/file/d/0B0afsm3K5nFYNGQ3MmJlZGEtYjQ5My00OTJhLTkwNDMtOWEwMjRkYWJkZjAy/edit?usp=sharing
> As the lamps will radiate a LOT of heat, I lined the board under the lamps
> with aluminum foil to reflect the heat, being careful not to get the
> conductive foil too close to the spring steel contacts..
>
> The lamps should be used instead of the primary, not in series with it.
>  Having the primary in series with the lamps might kinda work, but there
> would still be a good deal of RF oscillations, damped by the added
> resistance of the lamps.
>
> Regards, Gary Lau
> MA, USA
>
> On Sat, Jul 20, 2013 at 2:07 PM, Brandon Hendershot <
> brandonhendershot@xxxxxxxxx> wrote:
>
> > Mike,
> >
> > I've just had a look over the archives, and from what I've read I'm
> pretty
> > > sure that my issue lies with the SRSG firing timing. I came across a
> post
> > > from Gary Lau saying that he uses 500W halogen bulbs as a dummy load,
> and
> > > tunes his SRSG for max brightness. I think I'll run with this idea,
> along
> > > with building a Freau phase adjuster circuit to adjust the phase more
> > > accurately. Do others use the halogen bulb dummy load? Is there
> anything
> > I
> > > need to be aware of before attempting this?
> > >
> >
> > Good choice on the phase controller. I use a dummy load identical to
> Gary's
> > and as far as I can tell it works great. Something I misunderstood
> though,
> > make sure that the load goes in 'series' with the primary, not in place
> of
> > it. I thought it replaced it entirely, which apparently wasn't the case.
> >
> >
> > > Clearly the halogen dummy load will experience the full 10kV output of
> > the
> > > NST - so I presume they're capable of withstanding high voltages? Would
> > > this bulb be suitable?
> > >
> > > http://www.bltdirect.com/product.php?pid=411&cat=56
> >
> >
> > Those are the exact type of bulbs I'm using. Go ahead and get spares,
> they
> > can be rather 'cheap' when you get them for cheap. I'm running with 3 at
> > 15kV (120mA) so you should be able to get away with just two bulbs in
> > series (unless the design states otherwise).
> >
> >
> > > Cheers
> > >
> > > Mike
> >
> >
> > Good luck
> >
> > Brandon H.
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