need a 100K-Megaohm resistor (100 Giga-Ohm)

[Bill Fuqua]

      A greater concern is the breakdown voltage. Many of the glass sealed 
resistors are sealed with low pressure gas and have a low break down 
voltage, the low pressure gas ionizes easily. Some have atmospheric 
pressure dry gas and much higher break down voltage. The glass ones are not 
as common today. High values are mostly epoxie or silicone coated ones.  I 
have some silicone coated ones that are 10 GOhms and I think they may make 
them in 100G values as well, even these were special order and had to order 
a minimum number of them for about $15 or $20 each.
Another issue is getting a good CK5886 electrometer tube. These are hard to 
come by nowadays and about half of them have a bit of gas in them. Enough 
to make them useless due to ion currents. You may have to get several 
before you find one with low enough grid current.

73
Bill wa4lav


At 03:32 PM 8/7/2006 -0400, J. Forster wrote:
>Brian Carling wrote:
>
> > $%4 each!! Wow, I think I can supply them for less than that.
> > Let me check - how many do you need?
> > How many WATTS do they need to be?
> >
> > - Brian
>
>WATTS ???  You GOTTA be kidding. Do the math. At 1 KV, the power 
>dissipation is
>1/100000 W.
>-John
>
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