Re: {Collins} Question about the .05 1600 Volt cap in 516-f2

Problem--13 week delivery as they are out of stock!

-----Original Message-----
From: Glen Zook [mailto:gzook@xxxxxxxxx] 
Sent: Tuesday, June 21, 2011 2:48 PM
To: collins@xxxxxxxxxxxxx; kc9cdt@xxxxxxx; Richard Knoppow
Subject: Re: {Collins} Question about the .05 1600 Volt cap in 516-f2

According to the parts list in the 516F-2 manual dated 15 February 1968 the
capacitor is a 0.05 mfd at 1000 volt with a tolerance of +/- 10%.  That
means it can vary anywhere between 0.045 mfd to 0.055 mfd.  

Mouser has a 1250 volt 0.047 mfd 5% capacitor, part number 


For $2.59 each in single quantities.  With tolerances that means the value
is going to be between 0.04935 mfd and 0.04465 mfd.  Basically, that means
the capacitor is going to fall within the original tolerance range.

I would not hesitate to use this capacitor.

Glen, K9STH


--- On Tue, 6/21/11, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

Check the two sources I posted. One lists 0.05uf caps but they may not
actually have them.  The cap may be used to resonate the choke. The
combination calculates to about 251hz, an 0.047 cap would move it up to
about 261hz. Resonating chokes is one way of reducing ripple and improving
regulation.. If you really need 0.05 you can use a 0.047 and pad it up with
a small high voltage cap.

I am not sure how critical the value is since the effective inductance of
the choke is going to vary with the current through it.

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