Re: HV resistors for MMC

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

Original poster: "B2 by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bensonbd-at-boo-dot-net>

Hi Sean:
    I've used the larger Mox in a Marx.  They tracked.  Upon inspection, I
found that the conducting track was a thin conducting line traced on the
ceramic tube and covered with "silicone" coating.  The track spiraled
around the tube then curved back to spiral back the other way.  This
pattern continued up the ceramic tube.  If you layed it out flat it would
look like a mountain road with switchbacks.  The tracking occured at the
switchbacks.

    The tracking may be of danger only in a Marx.  In my experience the
resistors with a solid carbon composition (or extruded-i.e. U. S. Resistor)
core or uniform contiguous film coating work best for pulse type
applications. With the aforementioned in mind I would e-mail the company
and ask for detailed specs about the construction (ask them to e-mail them
if possible).  I didn't see any details on their web site.

Cheers,
Barry

----- Original Message ----- 
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, June 26, 2002 10:28 AM
Subject: HV resistors for MMC


> Original poster: "Sean Taylor by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<taylorss-at-rose-hulman.edu>
> 
> I don't know if anyone has brought up these resistors before, but I was
> looking around on digikey, and found these: MOX400J-10M-ND,
> http://www.ohmite-dot-com/catalog/pdf/v_minimox.pdf, they are the mox-400-23,
> the epoxy coated ones.  Currently only $4.80 for 50 of them, not too bad.
> Anyone use these before? Don't know why they wouldn't work, they're rated at
> 3/4 W, and 2500 V!
> 
> Sean Taylor
> 
>