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Author Topic: Source for HV Doorknob Capacitors  (Read 2300 times)
KB0TUV
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Posts: 1




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« on: April 12, 2013, 06:09:09 PM »

Looking for a little help, I need a 7000pf ceramic doorknob cap rated at 8kv or higher.

I have found some at mouser, digikey, etc. made by TDK in 15kv for about $55 plus shipping.

I heard most of these come from Europe.

      Thanks for looking

               73

                          KB0TUV
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N3QE
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Posts: 2197




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« Reply #1 on: April 12, 2013, 06:17:46 PM »

Russian surplus doorknob caps are often on E-bay. I've bought from several Lithuanian and Russian vendors of similar RF parts with great success.

rfparts.com has both new and pull doorknobs.

Digikey prices for TDK doorknobs are often competitive with above. These are "laser power supply capacitors" in modern terms. AFAIK, made in China, not Europe. Screw threads on Russian and Chinese doorknob caps are M5x0.8, not 10-32 (which is really close!)

7000pF at 8kV is very likely to be X5V or Y5S dielectric - probably fine for blocking purposes but not so good for tuned circuits. I'm assuming from context this is for a blocking capacitor.
« Last Edit: April 12, 2013, 06:28:10 PM by N3QE » Logged
N0NZG
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Posts: 122




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« Reply #2 on: April 25, 2013, 09:18:14 PM »

I have good luck with these caps. shipping is kinda steep,but what the heck. They also have lots of other goodies.


http://qro-parts.com/index.php?cPath=25
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