At a hamfest yesterday, I bought a Barker and Williamson CX 62 C
variable air condenser. It's 8"x6"x6" and made with ceramic and
polished stainless steel plates that are 1/2" apart. The craftmanship
is superb and it's literally a work of art. It's a shame these
beautiful components are no longer crafted. And, it was a great buy.
Prior to buying it, I checked it and the capacitance varies from 0.01
to .04 nF. Yes, nanofarads. My plan is to increase the maximum
capacitance to 20 - 40 nF by changing the dialectric and spacing
between the plates. I am building a 3/8" acrylic housing for it.
Changing the spacers between the plates is simple. I can even add a
few more plates. Question is what dialectric should I choose that will
have 500 - 1000 k and good dialectric strength? Either a gas or liquid
dialectric would do or even application directly to the plates is a
possibility. According to R. Hull's recent post capacitance resides in
the dialectric only, rather than the plates. Maybe this is a place for
Kristin's XeS6 or what ever that dialectric was. Any thoughts?
I cannot find the recent posting of modern dialectric constants and
their strengths. Would someone please repost it publically or