[Collins] In Need Of ..

[Stuart Martin]

Thank you Jerry for your response.

I understood that C206 contained PCB's. Glad to know now that was not the
case.

The leaking was contained with in a week or two. I had inspected the unit
often during the year and nothing appeared abnormal. Running the 30S-1
during the refurbishing period resulted in no apparent voltage breakdown or
arcing.

And yes, I am familiar with the 120Hz resonating circuit. The Plastic
Capacitor specs I received were based on the specs and schematic I submitted
(7-15kv, I believe). I measured the Q of the combo at 8.9 which I recall is
specs for the 2800vdc @3% regulation. PC knew exactly where and how their
cap would be used. Had I decided to go with that option, They invited me to
send along the original Collins part for analysis, but because of a medical
problem with my internal master clock, I was forced to abandon the entire
project. All that remains is on the CRA Web site in the Album section under
Summer 2005. The hundreds of photos taken during the power supply and relay
chassis removal and rebuild were deleted when I realized that hopes of
completing my book, "Refurbishing the 30S-1, Part-by-Part," came to an end.

As an 17 year old at Harrison Radio's NY store in '62 where I first use one,
to the Navy base in northern Germany in '67 when I used my last, hopes faded
that I would own one. During the years working with Collins gear my favorite
of all was the 30S-1. It wasn't until my XYL brought one from a local Ham
did my dream unfold. As she often said, "...You can always be buried in it."
So like my dreams of running a 30S-1 died, so did my loving wife Molly. She
passed away May 24th. 

73,
Stu



-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. Johnson
Sent: Tuesday, June 12, 2007 11:43 AM
To: collins at mailman.qth.net
Subject: RE: [Collins] In Need Of ..

On Tue, 2007-06-12 at 07:36 -0400, Stuart Martin wrote:
> If that cap isn't dried out, the leak can be stopped. I used a 
> soldering iron and resealed the top crimp with solder. If the ceramic 
> insulator is leaking, tighten it them. Try not to breath the fumes.

Fumes of pyranol have never hurt anyone. Drinking it is hard on bodies.
For decades factory workers worked with arms and hands immersed in the
stuff. But don't ingest the liquid. There are other chlorinated biphenyls
that are more hazardous but all get marked with the same brush as bad.

> The cap read 150 nf
> on my Fluke 110. Yes, it does work.

Air in the places where oil should be can lead to voltage breakdown of the
air and the arc terminating at the oil surface will make carbon of the oil.
Checking the value of capacitance is not a sufficient test for such a high
voltage capacitor. It needs to be tested for arcing at rated voltage.
> 
> New "Plastic" replacements can be bought in quantities of 100 from 
> Plastic Capacitors Inc., but they will require different mounting 
> holes. PC will provide mechanical drawings, but I never pursued the 
> issue after the solder fix.
> 
> Stu, k2qde
> 
The 0.15 mf tunes the plate filter choke to 120 Hz for better rejection.

--
73, Jerry, K0CQ, Technical Advisor to the CRA All content copyright Dr.
Gerald N. Johnson, electrical engineer

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