[Hammarlund] SP-600-25C
wb3fau55 at neo.rr.com
wb3fau55 at neo.rr.com
Tue Jan 24 12:48:44 EST 2017
Yes, maybe the transformer tap. I had space heater plugged into same line at the time, may have been enough voltage drop to cause this? Transformer is a 25 to 60HZ variety. Thanks for tips guys! Russ.
---- hammarlund-request at mailman.qth.net wrote:
> Send Hammarlund mailing list submissions to
> hammarlund at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/hammarlund
> or, via email, send a message with subject or body 'help' to
> hammarlund-request at mailman.qth.net
>
> You can reach the person managing the list at
> hammarlund-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Hammarlund digest..."
>
>
> Today's Topics:
>
> 1. Hammarlund] HX-500 LV choke (Dave W5QWX)
> 2. SP-600-25C (wb3fau55 at neo.rr.com)
> 3. Re: SP-600-25C (Bill Cromwell)
> 4. Re: HX-500 LV choke (Jeff)
> 5. Re: SP-600-25C (D C _Mac_ Macdonald)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 22 Jan 2017 16:03:42 -0600
> From: "Dave W5QWX" <dave at W5QWX.com>
> To: <Hammarlund at mailman.qth.net>
> Subject: [Hammarlund] Hammarlund] HX-500 LV choke
> Message-ID: <B1018C1D1DE24313AD288A3CA11957DA at DavidPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Jeff,
> I would suggest measuring the LV current thru the choke before replacing it out of hand.
>
> I had that same experience with an old NC-183D receiver sometime back. I finally got things
> under control (cool running choke and transformer). The old RX had lots of leaky caps, filter
> and bypasses along with out of tolerance resistors. By measuring the current and voltage thru
> the choke it was found the LV was about 40-50 volts high and the current was 180 mils, which
> is way too much for the old beast. Even after changing the bad caps and resistors, the voltage
> was still high causing the current to also remain higher than normal. All the RX specs were made
> assuming a 110-115 VAC line voltage. My average line voltage here was 122 vac. After first solid
> stating the power supply and installing a bucking transformer and using the filament tap from the
> old rectifier tube, the voltage came into specs and the current thru the choke was down to 117 mils.
> Now the beast runs cool and still works great.
> Hope you can solve your HX-500 problem with out having to replace a choke that may only have
> too much current pulled thru it from other causes.
>
> Best to you on getting it sorted out.
> 73,
> Dave de W5QWX
>
> ------------------------------
>
> Message: 2
> Date: Sun, 22 Jan 2017 20:43:02 -0500
> From: <wb3fau55 at neo.rr.com>
> To: hammarlund at mailman.qth.net
> Subject: [Hammarlund] SP-600-25C
> Message-ID: <20170123014302.H3RAX.244888.root at cdptpa-web18>
> Content-Type: text/plain; charset=utf-8
>
> So, ongoing issues, but it looks like I fixed it. Putting the 600 on lime in my shack, it developed a real bad drift problem. As I had taken apart the RF deck, I found vitamin Q caps installed here. I did not change these. Just touching the 6C4 HF osc tube, caused more drift. I shut it down, pulled the 6C4, sprayed D5 in the tube socket, sucked it out with a shop vac. I installed a new 6C4 and an IERC black tube shield. Ran it all day, seems just fine now. I have found problems before with 6C4s. Comments and experiences appreciated. 73s Russ.
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 22 Jan 2017 21:23:55 -0500
> From: Bill Cromwell <wrcromwell at gmail.com>
> To: hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] SP-600-25C
> Message-ID: <414ed26c-0189-9d45-3506-2616ceaaefba at gmail.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Hi Russ,
>
> Once upon a time I had a Hammarlund HQ-145X. When I first got it I
> thought of it as my HF band scanner because it drifted so much. I was
> able to pinpoint the HFO with it's 6C5 as the drifty unit. I did just
> about what you did. I ran some 6C4 tubes over my tube checker and they
> all checked good - including the one from the HQ-145X. Some of the tubes
> drifted a lot and some didn't. I set the good ones aside and wasted the
> others. After that the receiver held it's frequency well enough to use
> it in Navy-Marine Corps MARS traffic nets. Those folks were kind of
> fussy. I wonder what ever happened to them.
>
> 73,
>
> Bill KU8H
>
> On 01/22/2017 08:43 PM, wb3fau55 at neo.rr.com wrote:
> > So, ongoing issues, but it looks like I fixed it. Putting the 600 on lime in my shack, it developed a real bad drift problem. As I had taken apart the RF deck, I found vitamin Q caps installed here. I did not change these. Just touching the 6C4 HF osc tube, caused more drift. I shut it down, pulled the 6C4, sprayed D5 in the tube socket, sucked it out with a shop vac. I installed a new 6C4 and an IERC black tube shield. Ran it all day, seems just fine now. I have found problems before with 6C4s. Comments and experiences appreciated. 73s Russ.
> > ______________________________________________________________
> > Hammarlund mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Hammarlund at mailman.qth.net
> >
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: dfischer at usol.com **
> >
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
>
> --
> bark less - wag more
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 22 Jan 2017 22:44:34 -0500
> From: Jeff <jeff at podengo.com>
> To: hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] HX-500 LV choke
> Message-ID: <83eb18d4-1336-d073-43f9-717579953418 at podengo.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> thanks to all that provided advice.
>
> Got a new problem I need to track down now... most of the resistors in
> the rig are at least 15-20% out of tolerance (that's figuring that most
> of them are 10%ers anyways...)
>
> So in working through it, I did about a half dozen replacements, turned
> it on and as soon as things started to conduct, I toasted R19 (300 volts
> to the plate of V3A - first mixer). It's a 1K 1/4 watt according to the
> schematic, but it looks like someone cobbled a really awful solder job
> on a replacement component.
>
> So now I'm dead in the water -- gone through the schematic, retraced all
> my steps and everything seems to be hooked up correctly with the right
> value replacement resistors.
>
> Gotta quit for the day, but any insights from those who have one of
> these would be most appreciated.
>
> --jeff
>
>
> On 1/22/2017 2:53 PM, Jeff wrote:
> > All - Continuing to troubleshoot the HX-500. Making a bit of
> > progress and finding lots of out of tolerance resistors.
> >
> > It seems however that the LV choke (pn 26302) in the rig is running
> > quite hot -- so much that it's uncomfortable to put your hand on the
> > frame (I tested it first for voltage there... hi hi).
> >
> > I'm assuming that kind of heat probably isn't normal -- and possibly
> > could explain the higher than normal voltage coming out of the LV
> > power supply section?
> >
> > Anyways, I'm inclined to replace it with something "new", like a
> > Hammond 157M which has the same inductance and series resistance as
> > the original choke ( 8 Hy and 250 ohms). The 157 is only rated at 100
> > mA though.
> >
> > Might anyone have a suggestion as to a replacement, short of having
> > the original rewound?
> >
> > Thanks!
> >
> > Jeff
> >
> > WB3JIH
> >
> >
> >
> > ______________________________________________________________
> > Hammarlund mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Hammarlund at mailman.qth.net
> >
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: dfischer at usol.com **
> >
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 23 Jan 2017 14:35:39 +0000
> From: D C _Mac_ Macdonald <k2gkk at hotmail.com>
> To: Bill Cromwell <wrcromwell at gmail.com>
> Cc: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net>
> Subject: Re: [Hammarlund] SP-600-25C
> Message-ID:
> <SN2PR0501MB989AFBFE7F626A32D6BE646F1720 at SN2PR0501MB989.namprd05.prod.outlook.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> My HQ-145X was also stable enough for use
> on 10 and 15 meter SSB. I added the NCX-3 AGC and product detector circuitry. I sold or traded it just before I headed for a USAF tour in Germany.
>
> I wish I still had it.
>
> 73 de Mac, K2GKK/5 in OKC, OK
>
> Sent from my iPhone
>
> On Jan 22, 2017, at 20:29, Bill Cromwell <wrcromwell at gmail.com> wrote:
>
> Hi Russ,
>
> Once upon a time I had a Hammarlund HQ-145X. When I first got it I thought of it as my HF band scanner because it drifted so much. I was able to pinpoint the HFO with it's 6C5 as the drifty unit. I did just about what you did. I ran some 6C4 tubes over my tube checker and they all checked good - including the one from the HQ-145X. Some of the tubes drifted a lot and some didn't. I set the good ones aside and wasted the others. After that the receiver held it's frequency well enough to use it in Navy-Marine Corps MARS traffic nets. Those folks were kind of fussy. I wonder what ever happened to them.
>
> 73,
>
> Bill KU8H
>
> > On 01/22/2017 08:43 PM, wb3fau55 at neo.rr.com wrote:
> > So, ongoing issues, but it looks like I fixed it. Putting the 600 on lime in my shack, it developed a real bad drift problem. As I had taken apart the RF deck, I found vitamin Q caps installed here. I did not change these. Just touching the 6C4 HF osc tube, caused more drift. I shut it down, pulled the 6C4, sprayed D5 in the tube socket, sucked it out with a shop vac. I installed a new 6C4 and an IERC black tube shield. Ran it all day, seems just fine now. I have found problems before with 6C4s. Comments and experiences appreciated. 73s Russ.
> > ______________________________________________________________
> > Hammarlund mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Hammarlund at mailman.qth.net
> >
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: dfischer at usol.com **
> >
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> --
> bark less - wag more
>
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ------------------------------
>
> End of Hammarlund Digest, Vol 150, Issue 2
> ******************************************
More information about the Hammarlund
mailing list