[R-390] R-390 Digest, Vol 224, Issue 3

John Wendler wendlerjrv at gmail.com
Sun Feb 26 22:53:04 EST 2023 

Thanks!

On Sun, Feb 26, 2023 at 3:16 PM <r-390-request at mailman.qth.net> wrote:

> Send R-390 mailing list submissions to
>         r-390 at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         http://mailman.qth.net/mailman/listinfo/r-390
> or, via email, send a message with subject or body 'help' to
>         r-390-request at mailman.qth.net
>
> You can reach the person managing the list at
>         r-390-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of R-390 digest..."
>
>
> Today's Topics:
>
>    1. Re: C553 replacement? (Barry)
>    2. Re: C553 replacement? (David Olean)
>    3. Re: C553 replacement? (Cecil acuff)
>    4. Re: C553 replacement? (David Wise)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 25 Feb 2023 23:08:21 -0500 (EST)
> From: Barry <n4buq at knology.net>
> To: Jim Whartenby <old_radio at aol.com>
> Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] C553 replacement?
> Message-ID:
>         <1580682127.29106555.1677384501993.JavaMail.zimbra at knology.net>
> Content-Type: text/plain; charset=utf-8
>
> I think C553 is only in the R390A.
>
> Thanks,
> Barry - N4BUQ
>
> ----- Original Message -----
> > From: "R-390 Mailing List" <r-390 at mailman.qth.net>
> > To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> > Sent: Saturday, February 25, 2023 10:03:27 PM
> > Subject: Re: [R-390] C553 replacement?
>
> > A quick look at the R-390 Collins preliminary manual indicates that
> C-606 and
> > C-608 are both rated at 100 vdcw.? Curious that C-608 has 174 volts
> across it
> > according to the voltage table for V-607.
> >
> > I did not find C553, which tube is associated with it?
> >
> > Regards,
> > Jim
> >
> > Logic: Method used to arrive at the wrong conclusion, with confidence.?
> Murphy
> >
> > -----Original Message-----
> > From: Barry <n4buq at knology.net>
> > To: John Wendler <wendlerjrv at gmail.com>
> > Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> > Sent: Sat, Feb 25, 2023 8:52 pm
> > Subject: Re: [R-390] C553 replacement?
> >
> > If I'm not mistaken, Dave Medley (and others) suggest that 180v
> regulator issues
> > in the R390 might be due to leakage in C606 and/or C608 and I think
> those are
> > typically Vitamin Q capacitors.
> >
> > Thanks,
> > Barry - N4BUQ
> >
> > ----- Original Message -----
> >> From: "John Wendler" <wendlerjrv at gmail.com>
> >> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> >> Sent: Saturday, February 25, 2023 6:01:07 PM
> >> Subject: [R-390] C553 replacement?
> >
> >> The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01
> uF,
> >> 300 V.? It looks good visually and is not a Brown or Black Beauty of
> >> Death.
> >>
> >> What's the group experience with the reliability of the Vitamin Q caps?
> >>
> >> V/r,
> >>
> >> JP N5CQU
> >> ______________________________________________________________
> >> R-390 mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/r-390
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:R-390 at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 26 Feb 2023 10:34:22 -0500
> From: David Olean <k1whs at metrocast.net>
> To: John Wendler <wendlerjrv at gmail.com>, r-390 at mailman.qth.net
> Subject: Re: [R-390] C553 replacement?
> Message-ID: <088fe505-86c2-314f-d65b-0f4f86ab2c37 at metrocast.net>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Hey JP,
>
> They seem to last forever. I have run into a few that have started to
> leak and have replaced them for that reason. I never found a bad Vit Q.
> that caused an electrical problem.
>
> Dave K1WHS
>
> On 2/25/2023 7:01 PM, John Wendler wrote:
> > The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01
> uF,
> > 300 V.  It looks good visually and is not a Brown or Black Beauty of
> > Death.
> >
> > What's the group experience with the reliability of the Vitamin Q caps?
> >
> > V/r,
> >
> > JP N5CQU
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 26 Feb 2023 11:03:43 -0600
> From: Cecil acuff <chacuff at gmail.com>
> To: John Wendler <wendlerjrv at gmail.com>
> Cc: r-390 at mailman.qth.net
> Subject: Re: [R-390] C553 replacement?
> Message-ID: <734895F6-B53B-45A0-93D2-CFB6252A12E5 at gmail.com>
> Content-Type: text/plain; charset=utf-8
>
> My standard for repair of the 390 series is to replace paper caps on the
> R-390 ?as needed? based on symptoms and leakage testing, (Which is rarely)
> and ?replace all? in the R-390A as a rule.  You can replace as needed in
> the R-390A but you will be replacing caps on a routine basis until all are
> eventually replaced.
>
> I too have seen next to no Vitamin Q cap failures.
>
> Cecil
> K5DL
>
> Sent from my iPhone
>
> > On Feb 25, 2023, at 6:01 PM, John Wendler <wendlerjrv at gmail.com> wrote:
> >
> > ?The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01
> uF,
> > 300 V.  It looks good visually and is not a Brown or Black Beauty of
> > Death.
> >
> > What's the group experience with the reliability of the Vitamin Q caps?
> >
> > V/r,
> >
> > JP N5CQU
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 26 Feb 2023 20:15:43 +0000
> From: David Wise <d44617665 at hotmail.com>
> To: Barry <n4buq at knology.net>, Jim Whartenby <old_radio at aol.com>
> Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] C553 replacement?
> Message-ID:
>         <
> BY5PR04MB68202481DC46100EF5B308A1AEAE9 at BY5PR04MB6820.namprd04.prod.outlook.com
> >
>
> Content-Type: text/plain; charset="Windows-1252"
>
> That?s correct, C553 is a coupling cap into the R-390A mechanical filter.
> It?s a catastrophe if it shorts.  Many people replace it even though it?s a
> Vitamin Q which should still be good.  I kept the old cap and inserted a
> current limiter, using a Supertex (now Microchip) LND-150 depletion-mode
> MOSFET.  Just connect drain upstream, and source & gate downstream, and
> voila, 1mA limit.
>
> In the R-390, C606 sees 1/19th of 180V so it will last forever.  C608 sees
> about 180-10+5 or 175V.  If it leaks, the regulator will throttle down.  If
> you suspect this, measure voltage across 6BH6 grid resistor R624; it should
> be zero.  Slight leakage is worse than severe leakage, because the 6080?s
> will overheat.
>
> On pdf page 10 of 34 of TM 11-5820-357-35P, C608 is listed as type
> CP10A1EE224M.  CP is hermetically-sealed paper.  In specification
> MIL-C-25D, the second E indicates 400 volts.
>
> Dave Wise
> SWL (Inactive)
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
>
> From: Barry<mailto:n4buq at knology.net>
> Sent: Saturday, February 25, 2023 8:08 PM
> To: Jim Whartenby<mailto:old_radio at aol.com>
> Cc: R-390 Mailing List<mailto:r-390 at mailman.qth.net>
> Subject: Re: [R-390] C553 replacement?
>
> I think C553 is only in the R390A.
>
> Thanks,
> Barry - N4BUQ
>
> ----- Original Message -----
> > From: "R-390 Mailing List" <r-390 at mailman.qth.net>
> > To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> > Sent: Saturday, February 25, 2023 10:03:27 PM
> > Subject: Re: [R-390] C553 replacement?
>
> > A quick look at the R-390 Collins preliminary manual indicates that
> C-606 and
> > C-608 are both rated at 100 vdcw.  Curious that C-608 has 174 volts
> across it
> > according to the voltage table for V-607.
> >
> > I did not find C553, which tube is associated with it?
> >
> > Regards,
> > Jim
> >
> > Logic: Method used to arrive at the wrong conclusion, with confidence.
> Murphy
> >
> > -----Original Message-----
> > From: Barry <n4buq at knology.net>
> > To: John Wendler <wendlerjrv at gmail.com>
> > Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> > Sent: Sat, Feb 25, 2023 8:52 pm
> > Subject: Re: [R-390] C553 replacement?
> >
> > If I'm not mistaken, Dave Medley (and others) suggest that 180v
> regulator issues
> > in the R390 might be due to leakage in C606 and/or C608 and I think
> those are
> > typically Vitamin Q capacitors.
> >
> > Thanks,
> > Barry - N4BUQ
> >
> > ----- Original Message -----
> >> From: "John Wendler" <wendlerjrv at gmail.com>
> >> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> >> Sent: Saturday, February 25, 2023 6:01:07 PM
> >> Subject: [R-390] C553 replacement?
> >
> >> The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01
> uF,
> >> 300 V.  It looks good visually and is not a Brown or Black Beauty of
> >> Death.
> >>
> >> What's the group experience with the reliability of the Vitamin Q caps?
> >>
> >> V/r,
> >>
> >> JP N5CQU
> >> ______________________________________________________________
> >> R-390 mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/r-390
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:R-390 at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> _______________________________________________
> R-390 mailing list
> R-390 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
> End of R-390 Digest, Vol 224, Issue 3
> *************************************
>

More information about the R-390 mailing list