[Boatanchors] GLASS CERAMIC CAPS

[Jim Liles]

Not likely VFO caps --- too large.

I would not use ML ceramics.  If you must --- buy with voltage ratings 10 
times what is required.  They don't break down but the capacity decreases 
rapidly with voltage, loosing 90% before reaching their rated voltage.

Buy a 600 volt cap if you want to use it at 50 volts.

Look at this clip.  It is a 1000v Multi layer ceramic cap --- the smaller ML 
versions behave even worse.

http://www.k9axn.com/capacitor/variable%20voltage/junkcap.avi

Kindest regards Jim

----------Original Message----- 
From: Bill and Liz
Sent: Sunday, June 12, 2016 7:27 AM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] GLASS CERAMIC CAPS

I’m repairing a friend’s HW-9 which has suffered several blown components 
including a pair of very small glass ceramic caps of .1 and .01 mfd.  The 
Heath manual gives no detailed information on these which are used 
extensively in this radio.  I can’t find anything similar but assume that 
ceramic multi-layer caps can be substituted as long as they will fit. 
Anyone have an idea what voltage rating these caps carry?  One would think 
that 50V would be adequate but...

Bill VE3NH
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