Re: [TCML] HV resistor

[jhowson4@xxxxxxxxxxx]

The purpose of the resistor is to be the divider between a Gabriel electrode and the running electrode in a Jacobs ladder 
Input power is 15Kv @ 60ma. 

The 3Meg series of 1W 1Meg had a really interesting failure mode where the air around the resistors become ionized (enviably flashing over) resulting in the Gabriel electrode never forming an arc and yet still drawing enough current to fry the resistors. So it was decided to just pay little more and go to more professional resistors. 

I cant use a water or oil for safety reasons. 

I was thinking about paralleling 5 of these; eBay item number 250779003858 
But, I figured that people on list might have something that would work laying around. 

Thanks, 
John "Jay" Howson IV 

----- Original Message ----- 
From: "Jim Lux" <jimlux@xxxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Friday, April 15, 2011 9:15:56 AM 
Subject: Re: [TCML] HV resistor 

On 4/14/11 10:18 PM, jhowson4@xxxxxxxxxxx wrote: 
> I am looking to acquire a 1-5 Mohm resistor for a college project, preferably wire wound and of a higher power. 
> (my three 1W 1meg carbon films in series are not cutting it, flash over issues) 
> 
> contact me off list if you might have something available 
> 
> Thanks, 
> John "Jay" Howson IV 
> _ 

How much power? How much voltage (a 1W is good for, maybe, 1000V, 
unless in oil)? Watch the power dissipation too.. 
Wirewounds are not wonderful for HV (they have an interesting breakdown 
phenomenon if they get nicked) and the inductance can bite you. 




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