[R-390] Capacitor tester...

[Pete Lancashire]

The LC-100's are to me the final eveolution of the high(er) voltage cap testers.

Don't have one yet, but will someday but having a TO-6A it would have to
show up really cheap. BTW can't remember the URL but TO do have failure
modes and should them selves be 'restored' be using. Ditto for Eico 950B's



In all most all cases I replace the caps. R-390A's, SP-600, AN/XXX etc to me
is worth the time and effort. But if is is for something of much less
value or a cheap
BCB set, or some weird value and not enough room to parallel up, I use a Sprague
TO-6A or my ZM-11/U.

-pete tossing another 2 cents in the jar


On Tue, Mar 6, 2012 at 5:58 PM, chacuff <chacuff at cableone.net> wrote:
> Hi John and group...
>
> John I'm a firm believer in using a cap analyzer in tube radio work.  The
> cap really needs to be tested at its rated voltage for leakage current.  I
> have been using the Sencore products for years.  The LC-53, LC-73 and
> currently the LC-102.  They work great.  A bit pricey at times but if you
> wait and watch you can usually pick one up priced right.
>
> It can be as simple as using a megar type device with the crank on the side.
> Works for fishing too if you don't get caught...:-)
>
> The important part is to check the caps at rated voltage.  I can't say I
> have ever found a Black Beauty or Brown Beauty that tested good....all had
> excessive leakage.  As a result I usually do a mass paper cap replacement
> but that is a personal thing.  Many only replace a few in the radio in key
> spots like the DC blocking cap that can cook your Mechanical filters in the
> "A" models and let the rest of the rock on...
>
> Be sure to check out the Pearls of Wisdom documents and the nicely done
> Y2KR390 manual....(may have that name wrong)  Both are must have
> resources....
>
> Good luck and drop questions on us anytime...someone will always know the
> answer!
>
> Cecil Acuff
> K5DL
> ----- Original Message -----
> From: "John Saxon" <johnbsaxon at yahoo.com>
> To: <r-390 at mailman.qth.net>
> Sent: Tuesday, March 06, 2012 6:05 PM
> Subject: [R-390] Capacitor tester...
>
>
>>I recently came into a 390 and 3 390As (I must be living right!).  I am not
>>an experienced restorer, and I am looking forward to becoming one :-)
>>
>> Question:  I have been working on equipping my workbench and I don't have
>> a capacitor tester.  Do I want one?
>>
>> I have a multimeter that measures capacitance, but I don't think it
>> sufficient for testing old caps, especially electrolytics...am I correct?
>>
>> Any suggestions?
>>
>> Many thanks & 73,
>> John
>> K5ENQ
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