Re: [TCML] 833A Tube

[Ed Phillips <evp@xxxxxxxxxxx>]

	Some ceramic capacitors drift and some don't.  Normal HV filter capacitors are quite lossy and drift as they warm up while running in TC applications.  On the other hand, some special high-frequency [and hihg priced] ceramic capacitors are excellent with exceedingly low series resistance.

	Mica capacitors are fine if you respect their ratings.  Don't know about the snubber types.

Ed

"Hi Rob,

I have been following the VTTC threads for quite awhile now. I recall that
ceramics drift as they heat so you go out of tank resonance. Mica seems to
be the cap of choice. What about CDC caps? There was some discussion of
strontium Titrate (is this close:-) ceramics which are better. I believe
Bert Hickman was discussing this. It's in the archives for sure!

Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Rob Byron
Sent: Thursday, January 29, 2009 9:21 AM
To: Tesla Coil Mailing List
Subject: RE: [TCML] 833A Tube

Hi jim, Dave, 
Thanks. I am planning to build my first VTTC and chose to use Steve wards
single 833a design. After seeing the $200 price for the tube I almost
scraped the idea. I can handle $90 for a tube. All the caps are going to set
me back as it is. I have two MOT's set aside for this project. I also have
some 1400pF 20Kv doorknobs from a laser project, does anyone know if these
will work for a VTTC? 

Rob. 


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