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 

505-FKP10.047/1250/5

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

Website:  http://k9sth.com


--- 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.
_______________________________________________
SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
http://www.collinsradio.org/membership/

 NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
  1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)

The Collins Reflector reserves the right to refuse access to anyone.

LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx This ONLY goes to the
list admins and does not post to the group!



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1382 / Virus Database: 1513/3717 - Release Date: 06/21/11








This archive was generated by a fusion of Pipermail (Mailman edition) and MHonArc.