[R-390] ballast tube solid state substitute
jm
josemic at gmail.com
Wed Dec 2 14:07:50 EST 2020
Fred,
I haven't noticed any change in the PTO end point alignment.
The readout is as accurate as always.
There are, at least, two different solid state substitutes: the one of
Sigmapert and another one that is sold on ebay in a regular basis.
Mine is the last one.
Regards
El mié, 2 dic 2020 a las 18:38, <r-390-request at mailman.qth.net> escribió:
> 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. New revision of my document 'My R-390A Cosmos PTO
> Observations' (Larry H)
> 2. Re: New revision of my document 'My R-390A Cosmos PTO
> Observations' (Manfred Antar)
> 3. Re: New revision of my document 'My R-390A Cosmos PTO
> Observations' (Fred Moore)
> 4. Re: ballast tube (Fred Moore)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 1 Dec 2020 19:45:36 -0800
> From: Larry H <larry41gm at gmail.com>
> To: R-390 Forum <r-390 at mailman.qth.net>
> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> Subject: [R-390] New revision of my document 'My R-390A Cosmos PTO
> Observations'
> Message-ID:
> <CAOSJ_nt=HD4=
> GkBzpEG7DBGpGvcrZ_Ca2baP+9bT9SApUTDZQw at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi All,
> I did a major update to my subject document and thought a better location
> for it would be in the 'Tutorials' section of our R-390A disk. The
> original is pointed to from the 'Pearls of Wisdom' index. I added a lot of
> information about the linearity mechanism in it. You can find it in the
> 'Tutorials' section with this link:
>
> http://r-390a.net/faq-refs.htm#Tutorials
>
> Or, you can look at the new version directly with this link:
>
> http://r-390a.net/R390A_Cosmos_PTO_Observations_LH_rev1.pdf
>
> Happy Holidays.
>
> Regards, Larry
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 1 Dec 2020 20:03:34 -0800
> From: Manfred Antar <manfredantar at gmail.com>
> To: Larry H <larry41gm at gmail.com>
> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] New revision of my document 'My R-390A Cosmos PTO
> Observations'
> Message-ID: <54FD21D9-B103-4B25-BBB7-423D2A4C37CD at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> Brilliant - Well Done !!!!
> Thanks !!!
>
>
> > On Dec 1, 2020, at 7:45 PM, Larry H <larry41gm at gmail.com> wrote:
> >
> > Hi All,
> > I did a major update to my subject document and thought a better location
> > for it would be in the 'Tutorials' section of our R-390A disk. The
> > original is pointed to from the 'Pearls of Wisdom' index. I added a lot
> of
> > information about the linearity mechanism in it. You can find it in the
> > 'Tutorials' section with this link:
> >
> > http://r-390a.net/faq-refs.htm#Tutorials
> >
> > Or, you can look at the new version directly with this link:
> >
> > http://r-390a.net/R390A_Cosmos_PTO_Observations_LH_rev1.pdf
> >
> > Happy Holidays.
> >
> > Regards, Larry
> > ______________________________________________________________
> > 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: Wed, 02 Dec 2020 18:20:17 -0000
> From: "Fred Moore" <fred_moore at usa.net>
> To: Larry H <larry41gm at gmail.com>, <fred_moore at usa.net>
> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] New revision of my document 'My R-390A Cosmos PTO
> Observations'
> Message-ID: <239yLBsTR8096Set.1606933217 at web06.cms.usa.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Larry,
>
> That is a great explanation of restoring the R-390A Cosmos PTO. I have two
> R-390 PTOs to look over inside. I am wondering if the same approach
> applies,
> or if there is something I need to do differently.
>
> Is Electric Radio the source of the R-390 CD? If so, it looks like they
> are
> at -0- right now. There may be an opportunity to update it. Then I will
> buy
> one.
>
> -Fred
>
> ------ Original Message ------
> Received: Wed, 02 Dec 2020 03:47:44 AM GMT
> From: Larry H <larry41gm at gmail.com>
> To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
> <r-390 at mailman.qth.net>
> Subject: [R-390] New revision of my document 'My R-390A Cosmos PTO
> Observations'
>
> Hi All,
> I did a major update to my subject document and thought a better location
> for it would be in the 'Tutorials' section of our R-390A disk. The
> original is pointed to from the 'Pearls of Wisdom' index. I added a lot of
> information about the linearity mechanism in it. You can find it in the
> 'Tutorials' section with this link:
>
> http://r-390a.net/faq-refs.htm#Tutorials
>
> Or, you can look at the new version directly with this link:
>
> http://r-390a.net/R390A_Cosmos_PTO_Observations_LH_rev1.pdf
>
> Happy Holidays.
>
> Regards, Larry
> ______________________________________________________________
> 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: Wed, 02 Dec 2020 18:37:20 -0000
> From: "Fred Moore" <fred_moore at usa.net>
> To: "Fred Moore" <fred_moore at usa.net>, jm <josemic at gmail.com>
> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] ballast tube
> Message-ID: <233yLBsKu9600Set.1606934240 at web12.cms.usa.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> JM,
>
> Have you noticed if replacing the ballast tube with a different one or a
> solid
> state one affects the PTO end point?
>
> -Fred
>
> ------ Original Message ------
> Received: Sat, 28 Nov 2020 08:32:07 PM GMT
> From: "Fred Moore" <fred_moore at usa.net>
> To: jm <josemic at gmail.com>Cc: Collins R-390 HF Receiver List
> <r-390 at mailman.qth.net>
> Subject: Re: [R-390] ballast tube
>
> Also, this tube has an expected life that is very short (3,000 hours?).
> -Frede
>
> ------ Original Message ------
> Received: Sat, 28 Nov 2020 07:33:43 PM GMT
> From: jm <josemic at gmail.com>
> To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
> <r-390 at mailman.qth.net>
> Subject: [R-390] ballast tube
>
> I had the same problem that Paul had. The result was 2 ballast tubes
> damaged.
>
> Eventually I substituted the ballast with a solid state device that is
> sold on ebay and hope the problem is solved for a long time.
>
> But the problem makes me wonder about why a military grade receiver that is
> intended to be working on tracks and ships is so fragile. In my experience
> (short) this is the only tube that is so weak and has no tolerance to
> light impacts when the filament is still warm.
>
> Regards,
> Jose
> EA8DCP
>
>
> El s?b, 28 nov 2020 a las 17:09, <r-390-request at mailman.qth.net> escribi?:
>
> > 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: Parts (Cecil)
> > 2. Re: The R-390 and R-390A bridge rectifier (Fred Moore)
> > 3. Anyone have a spare ballast tube? (Paul Staupe)
> > 4. Re: Anyone have a spare ballast tube? (Larry H)
> > 5. Re: Anyone have a spare ballast tube? (Jacques Fortin)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Wed, 11 Nov 2020 17:38:22 -0600
> > From: Cecil <chacuff at cableone.net>
> > To: R-390 at mailman.qth.net
> > Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> > Subject: Re: [R-390] Parts
> > Message-ID: <EEA8F4DA-E97A-4615-B80A-095D2ED21D44 at cableone.net>
> > Content-Type: text/plain; charset=utf-8
> >
> > I have decided to list this stuff on the auction site as my time permits
> > over the winter months. If interested keep an eye out for it there....if
> > not the delete key is in order.
> >
> > Thanks,
> >
> > Cecil
> > K5DL
> >
> > Sent from my iPad
> >
> > > On Nov 9, 2020, at 10:36 AM, Cecil <chacuff at cableone.net> wrote:
> > >
> > > ?On a bit of a fishing trip here but wanted to see if there is any
> > interest in R-390A parts.
> > >
> > > Going through and cleaning out and have an assortment of stuff that I
> > will need to move in the next couple months.
> > >
> > > What I don?t have are original meters, knob sets, top and bottom
> covers,
> > Utah plates. Already traded all those for another radio I had interest
> in.
> > >
> > > Also if you are doing restoration work on a larger scale and want to
> > make a deal on all this stuff...contact me off list and we will work
> > something out.
> > >
> > > I just can?t lift, work on or ship 100+lb radios anymore.
> > >
> > > Thanks folks!
> > >
> > > Cecil Acuff
> > > K5DL
> > >
> > > Sent from my iPad
> >
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Wed, 18 Nov 2020 19:31:43 -0000
> > From: "Fred Moore" <fred_moore at usa.net>
> > To: Norman Ryan <nnryann at yahoo.com>, <fred_moore at usa.net>
> > Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> > Subject: Re: [R-390] The R-390 and R-390A bridge rectifier
> > Message-ID: <072ykRTEr9184Set.1605727903 at web02.cms.usa.net>
> > Content-Type: text/plain; charset=utf-8
> >
> > I am using the following diode to replace the copper oxide bridge
> > underneath
> > the R-390 power supply. I fits nicely and has a mounting hole in the
> > case.
> > The same part can be used to replace the R-390A selenium thing.
> >
> > 4A 400piv.
> > Digikey GBU404DI-ND
> > MFR: GBU404
> >
> > -Fred
> >
> > ------ Original Message ------
> > Received: Sat, 26 Sep 2020 06:26:02 AM GMT
> > From: Norman Ryan via R-390 <r-390 at mailman.qth.net>
> > To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
> > <r-390 at mailman.qth.net>
> > Subject: Re: [R-390] The R-390A IF transformers internal resistors.
> >
> > Hi, all,
> > The schematic shows the IF coil resistors but not their values which
> leads
> > me
> > to suspect those resistors are selected based on each winding's
> > characteristic.
> > Is it feasible to try varying sizes and choose the ones that perform
> best??
> > Looking around my shop I've seen 39K and 47K resistors -- 47K being the
> > most
> > often encountered.
> > Absent a way to test, would it put a harelip on God's plan for salvation
> > if we
> > simply install 47K resistors and let it go at that?
> > 73Norman
> >
> > On Saturday, September 26, 2020, 1:27:05 AM EDT, Roy Morgan
> > <k1lky68 at gmail.com> wrote:
> >
> > Jacques,
> >
> > I don?t have info on the values of the resistors, but I do have a guess:
> >
> > Those resistors are there to ?spoil the Q? of the IF transformers, and in
> > general widen the passband.? It could be that in the two other radios you
> > tell about, the different manufacture coils have slightly different
> winding
> > resistance and thus need different parallel resistors to get the desired
> > bandpass.
> >
> > Indeed, there were articles that suggested removing those resistors to
> > ?make
> > the radio hotter?.? It was of course bad advice, and the resulting
> changes
> > in the actual performance were both un-necessary and bad.
> >
> > Note: in the MIT Radiation Laboratory series volume on ?Vacuum Tube
> > Amplifiers? by Valley and Wallman, Volume 18, there is an extensive
> > explanation of the engineering involved in bandwidth control in
> amplifiers
> > -
> > as applied to radar IF amplifiers (presumably mostly 30 mc).
> >
> > The entire 28 volume set is available in PDF form here:
> > https://www.febo.com/pages/docs/RadLab/
> >
> > Roy
> >
> > > On Sep 25, 2020, at 11:14 AM, Jacques Fortin <jacques.f at videotron.ca>
> > wrote:
> > >
> > > Hi all,
> > >
> > > I am still working on the last R-390A that followed me home. ... that a
> > previous
> > > "owner" removed all the resistors within the IF transformers.
> > >
> > > The windings test all OK and the caps looks like the original ones, so
> it
> > > may have been an attempt to "boost" the IF gain.
> >
> > Roy Morgan
> > K1LKY since 1958
> > k1lky68 at gmail.com
> >
> >
> >
> >
> > ______________________________________________________________
> > 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: 3
> > Date: Thu, 26 Nov 2020 14:11:58 -0600
> > From: Paul Staupe <staupe at gmail.com>
> > To: r-390 at mailman.qth.net
> > Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> > Subject: [R-390] Anyone have a spare ballast tube?
> > Message-ID:
> > <
> > CAOQ84atOZLxNYROpkEA6aSQE3uH5kjqPFyTfqiqzBvtu3EWMcw at mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > I made the mistake of moving my Collins non-A into its cabinet with the
> > filaments still warm and lost my ballast tube. Anyone have a spare?
> >
> > I was using the one out of my EAC R-390A when I went to a solid state
> unit
> > that's sold on eBay.... for some reason the non-A didn't like it but the
> > EAC didn't mind. Anyone else have that issue?
> >
> > Happy Thanksgiving everyone!
> >
> > Paul
> > Minnesota
> >
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Fri, 27 Nov 2020 20:16:09 -0800
> > From: Larry H <larry41gm at gmail.com>
> > To: Paul Staupe <staupe at gmail.com>
> > Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
> > Subject: Re: [R-390] Anyone have a spare ballast tube?
> > Message-ID:
> > <
> > CAOSJ_nta-4b8_44pSjHGF0Ab23ckzNDVmQPJVXkFF9O2eMhw7A at mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > Hi Paul, Sorry, I don't have a spare for you. However, a very common
> > substitute is a 12bh7 or 12by7, etc, if your ac power does not fluctuate
> > much. Most places are steady enough for them. The thing is that they
> > require a simple mod to the filament connections to use them.
> >
> > Happy Holidays to all.
> >
> > Regards, Larry
> >
> > On Thu, Nov 26, 2020 at 12:13 PM Paul Staupe <staupe at gmail.com> wrote:
> >
> > > I made the mistake of moving my Collins non-A into its cabinet with the
> > > filaments still warm and lost my ballast tube. Anyone have a spare?
> > >
> > > I was using the one out of my EAC R-390A when I went to a solid state
> > unit
> > > that's sold on eBay.... for some reason the non-A didn't like it but
> the
> > > EAC didn't mind. Anyone else have that issue?
> > >
> > > Happy Thanksgiving everyone!
> > >
> > > Paul
> > > Minnesota
> > > ______________________________________________________________
> > > 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: 5
> > Date: Sat, 28 Nov 2020 12:09:12 -0500
> > From: "Jacques Fortin" <jacques.f at videotron.ca>
> > To: "'Collins R-390 HF Receiver List'" <r-390 at mailman.qth.net>
> > Cc: 'Larry H' <larry41gm at gmail.com>, Collins R-390 HF Receiver List
> > <r-390 at mailman.qth.net>
> > Subject: Re: [R-390] Anyone have a spare ballast tube?
> > Message-ID: <[email protected]>
> > Content-Type: text/plain; charset="US-ASCII"
> >
> > Hi Paul,
> >
> > Fair Radio still have NOS 3TF7 ballast tubes in stock.
> > Or if you can find a 2HTF11B, it will be good also (this is the original
> > type used in the R-390s).
> > If the price asked is too much, just strap pins 2 and 4, then pins 5 and
> 7
> > of the 3TF7 socket and use either a 12BY7 or a 12BH7 in there.
> > No need to be a "good" tube, as far as the filaments are still good...
> >
> > 73, Jacques, VE2JFE
> >
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > R-390 mailing list
> > R-390 at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/r-390
> >
> >
> > End of R-390 Digest, Vol 199, Issue 2
> > *************************************
> >
>
> <
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> >
> Libre
> de virus. www.avast.com
> <
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> >
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> ______________________________________________________________
> 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 200, Issue 2
> *************************************
>
More information about the R-390
mailing list