[Collins] Re: Collins Digest, Vol 38, Issue 8

[J D Delancy]

Thanks to all who answered.  The suggestion by Stu, k2qde of soldering the 
top crimp worked, at least its sealed up.  Now to find the rest of the 
problems

    jd

----- Original Message ----- 
From: <collins-request at mailman.qth.net>
To: <collins at mailman.qth.net>
Sent: Tuesday, June 12, 2007 8:36 PM
Subject: Collins Digest, Vol 38, Issue 8


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> Today's Topics:
>
>   1. RE: In Need Of .. (Stuart Martin)
>   2. RE: 75A4 and SB 610 (Stuart Martin)
>   3. RE: 75A4 and SB 610 (Dr. Gerald N. Johnson)
>   4. RE: In Need Of .. (Dr. Gerald N. Johnson)
>   5. RE: In Need Of .. (Stuart Martin)
>   6. FS 75A4 (saad mahaini)
>   7. FS Brand New Collins CC2 Suitcase + Box (saad mahaini)
>   8. RE: In Need Of .. (Dr. Gerald N. Johnson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 12 Jun 2007 07:36:57 -0400
> From: Stuart Martin <k2qde at optonline.net>
> Subject: RE: [Collins] In Need Of ..
> To: collins at mailman.qth.net
> Message-ID: <000a01c7ace5$fbf42c00$0201a8c0 at l667r>
> Content-Type: text/plain; charset=us-ascii
>
> 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. The cap read 150 nf
> on my Fluke 110. Yes, it does work.
>
> 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
>
>
> -----Original Message-----
> From: collins-bounces at mailman.qth.net
> [mailto:collins-bounces at mailman.qth.net] On Behalf Of J D Delancy
> Sent: Monday, June 11, 2007 9:24 PM
> To: SMARC; SMCARA; smdaprs; collins at mailman.qth.net
> Subject: [Collins] In Need Of ..
>
>
> Need a 0.15 uf  at 5000 volt capacitor for a Collins 30S-1 amp; the one
> thats in it leaks oil and needs replacement.  Anyone got one that can be
> begged, borrowed, bantered or bought reasonable?
>
>   jd
>
>
> ______________________________________________________________
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>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 12 Jun 2007 07:55:12 -0400
> From: Stuart Martin <k2qde at optonline.net>
> Subject: RE: [Collins] 75A4 and SB 610
> To: collins at mailman.qth.net
> Message-ID: <000b01c7ace8$8861f620$0201a8c0 at l667r>
> Content-Type: text/plain; charset=us-ascii
>
> Dave,
>
> The science of using the SB-610 for "true" receiver signal analysis was
> documented by H.M. Goosier, W6VFR, in Ham Radio Magazine, March 1972, pg.
> 36. In his "Monitoring SSB Signals" article, W6VFR describes how the 75A-4
> and 75S- series, using the AM bandwidth, allows full wide-bandwidth signal
> analysis. It's similar to what I did in the Navy with R-390A's, only the
> monitor scope was a bit more sophisticated.
>
> Stu, k2qde
>
>
> -----Original Message-----
> From: collins-bounces at mailman.qth.net
> [mailto:collins-bounces at mailman.qth.net] On Behalf Of k6xyz
> Sent: Monday, June 11, 2007 7:21 PM
> To: collins at mailman.qth.net
> Subject: RE: [Collins] 75A4 and SB 610
>
> A 5pf maroon mica is what I use....works great.
>
> Regards
>
> Dave Harmon
> CCA 97-535
> K6XYZ[at]sbcglobal[dot]net
> Sperry, Ok.
>
> -----Original Message-----
> From: collins-bounces at mailman.qth.net
> [mailto:collins-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. 
> Johnson
> Sent: Monday, June 11, 2007 6:00 PM
> To: collins at mailman.qth.net
> Subject: Re: [Collins] 75A4 and SB 610
>
> On Mon, 2007-06-11 at 12:33 -0700, w6om at cox.net wrote:
>> I have a beautiful 75A4 and a beautiful Heathkit SB 610 monitor scope
>> with
> a 455 KC IF. Looking at the 75A4 schematic it would appear that it is 
> would
> be simple to connect the scope to the grid of one of the 455 KC IF tubes
> through a small capacitor so it does not load down the receiver IF strip.
>> Anyone with an "A4" ever accomplished this, if so which grid did you
> couple the SB 610 to and what formula did you use choosing the coupling
> capacitor value.
>> All the Best
>> --
>> Ron Weaver - W6OM
>
> The proper place to connect is the plate of the second mixer. Any place
> downstream is after the selectivity and tells little about the incoming
> signal because the mechanical filter cleans up bad signals.
>
> Usually a few PF is all it takes, the monitor scope has good sensitivity.
> --
> 73, Jerry, K0CQ, Technical Advisor to the CRA All content copyright Dr.
> Gerald N. Johnson, electrical engineer
>
> ______________________________________________________________
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>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 12 Jun 2007 09:45:04 -0600
> From: "Dr. Gerald N. Johnson" <g369n792j at ispwest.com>
> Subject: RE: [Collins] 75A4 and SB 610
> To: Stuart Martin <k2qde at optonline.net>
> Cc: collins at mailman.qth.net
> Message-ID: <1181663104.3861.9.camel at host.domain.com>
> Content-Type: text/plain
>
> On Tue, 2007-06-12 at 07:55 -0400, Stuart Martin wrote:
>> Dave,
>>
>> The science of using the SB-610 for "true" receiver signal analysis was
>> documented by H.M. Goosier, W6VFR, in Ham Radio Magazine, March 1972, pg.
>> 36. In his "Monitoring SSB Signals" article, W6VFR describes how the 
>> 75A-4
>> and 75S- series, using the AM bandwidth, allows full wide-bandwidth 
>> signal
>> analysis. It's similar to what I did in the Navy with R-390A's, only the
>> monitor scope was a bit more sophisticated.
>>
>> Stu, k2qde
>>
> Certainly using the AM filter gets a better sample of the distorted
> transmitted signal than looking after the SSB filter, but some badly
> distorted signals are wider than that and the AM filter will have
> cleaned up some of the splatter.
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 12 Jun 2007 09:42:31 -0600
> From: "Dr. Gerald N. Johnson" <gnjtwt at ispwest.com>
> Subject: RE: [Collins] In Need Of ..
> To: collins at mailman.qth.net
> Message-ID: <1181662951.3861.7.camel at host.domain.com>
> Content-Type: text/plain
>
> 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
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 12 Jun 2007 16:45:33 -0400
> From: Stuart Martin <k2qde at optonline.net>
> Subject: RE: [Collins] In Need Of ..
> To: CRA <collins at mailman.qth.net>
> Message-ID: <000301c7ad32$9fa24390$0201a8c0 at l667r>
> Content-Type: text/plain; charset=us-ascii
>
> 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
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 12 Jun 2007 14:28:39 -0500
> From: saad mahaini <saad.mahaini at verizonbusiness.com>
> Subject: [Collins] FS 75A4
> To: collins at mailman.qth.net, collins at listserve.com
> Message-ID: <003601c7ad27$e35e3400$618623a6 at mcilink.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hello,
>
> I have a nice 75A4 for sale.
>
> This one was manufactured after all of the service bulletins have been
> released, so this one has them all from the factory.
>
> Also, all of the caps that should be replaced have been replaced recently,
> including all of the black beauties, bypass, electrolytic, multi section
> can, and many others.  A complete recap job, even beyond the ER and CCA
> recommendations.
>
> Also, it has been fully aligned after recapping it, so the dial is on the
> money with the proper spread, super hot sensitivity, and everything is
> performing per the specs.  Weak tubes were replaced as necessary during 
> the
> alignment and all light bulbs were replaced with new ones.
>
> No mods, no extra (spare) holes, no new features.  Just a good looking 
> solid
> original A4 that plays super.
>
> Cosmetically, it's not a 10 but 9+. Very few minor little imperfections 
> but
> truly a nice piece.
>
> I have the original CW 500 Hz filter than I can sell with it as an option.
>
> I have prepared a special box that I will use to ship this receiver in. 
> It
> will be double boxed and with foam between the two boxes.  This radio will
> be boxed properly and will arrive just as it was shipped unless they drive 
> a
> forklift over it and in that case it will be insured for such accidents.
>
> I will ship it in the US for $1750 and will include the CW filter for an
> additional $200.  Shipping in the US is flat $50. I will ship
> internationally but will have to calculate the shipping cost.
>
> Please don't email me unless you are serious.  Please check with the wife
> first before you say you want it, and make sure that you will be able to
> send money after you buy it.  I will take paypal if the buyer pays the
> paypal fees, or I will take a MO.
>
> I will take some photos in the next few days to send to serious buyers
>
> 73 Saad N5FF
>
>
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Tue, 12 Jun 2007 14:46:55 -0500
> From: saad mahaini <saad.mahaini at verizonbusiness.com>
> Subject: [Collins] FS Brand New Collins CC2 Suitcase + Box
> To: collins at mailman.qth.net, collins at listserve.com
> Message-ID: <003701c7ad2a$6efa0820$618623a6 at mcilink.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hello,
>
> I'm selling a brand new Collins CC2 suitcase that comes with the manual.
>
> This is the case for the KWM2 and accessories.
>
> The suitcase comes inside the original Collins carton box.
>
> I want $350.  Shipping is $25 flat rate in the US.  International shipping
> will have to be calculated.
>
> 73 Saad N5FF
>
>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Tue, 12 Jun 2007 18:35:22 -0600
> From: "Dr. Gerald N. Johnson" <g369n792j at ispwest.com>
> Subject: RE: [Collins] In Need Of ..
> To: collins at mailman.qth.net
> Message-ID: <1181694922.3859.39.camel at host.domain.com>
> Content-Type: text/plain
>
> On Tue, 2007-06-12 at 16:45 -0400, Stuart Martin wrote:
>> Thank you Jerry for your response.
>>
>> I understood that C206 contained PCBs. Glad to know now that was not the
>> case.
>
> Pyranol is one of the PCBs. Not, in my opinion, one of the worst of the
> PCBs but all PCBs get the same bad treatment. The provable complaint
> about Pyranol today is that it never breaks down when released into the
> environment which is exactly what makes it a super capacitor dielectric
> and transformer coolant. The fact that other PCBs cause great illness
> has caused Pyranol to be treated badly. And major users and makers of
> Pyranol and its named competitive products have not treated the
> environment well, letting large quantities drain into rivers where it is
> in the sediment and the water life.
>
> If the capacitor oil has no odor, its not Pyranol. Pyranol has a
> distinctive odor and well sealed Pyranol filled capacitors will have
> more odor on days with falling pressure as the higher pressure trapped
> in the can pushes some through the seals.
>>
>> 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.
>
> Any failure in that capacitor would only show up as some heat in the
> capacitor and more power supply ripple which may not be evident in SSB
> transmissions with the PA in linear mode.
>>
>> 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.
>
> The variation of choke inductance with load current is great enough to
> not justify a high tuned circuit Q. When the choke inductance isn't what
> the capacitor was tuned to, the major 120 Hz component isn't suppressed
> as well as intended. It may be that leaving that capacitor out won't be
> very detectable in using the linear on the air. And the capacitor across
> the choke increases the higher frequency component in the current fed to
> the filter capacitors. There definitely is a trade off and I suspect
> increasing the main filter capacitors may be more effective at good
> filtering than tuning the filter choke.
>
>> 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
>>
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
>
>
> ------------------------------
>
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>
> End of Collins Digest, Vol 38, Issue 8
> **************************************