[ARC5] Broken Weller Soldering Gun case repair
Tom Bridgers
tarheel6 at msn.com
Sat May 30 17:36:45 EDT 2015
Recently my Weller Soldering Gun slipped off of the workbench and hit the concrete floor just right such that it completely cracked and severed the handle (or grip) from the gun's body.
I couldn't believe it. Thought a Weller gun was tougher than that.
But there it was ... totally unusable.
Couldn't find a replacement case on the 'Bay, and so wondered if it could be glued or taped back together. Taping would not work because of the length of the separated handle and the weight of the gun itself.
I've not had much success in the past gluing plastics , but surprisingly Super Glue, the gel version, worked, and I'm now back in business.
Thought this info might be helpful to others...
73,
Tom KE4RHH
On May 26, 2015 10:57 AM, arc5-request at mailman.qth.net wrote:
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Today's Topics:
1. Re: Tip of the day: (Roy Morgan)
2. Re: BC-455 - intermittant LO. (Sheldon Daitch)
3. Re: BC-455 - intermittant LO. (J Mcvey via ARC5)
4. Spline Wrenches for command sets (mstangelo at comcast.net)
5. Re: BC-455 - intermittant LO. (Rich Post)
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 May 2015 22:55:30 -0400
From: Roy Morgan <k1lky68 at gmail.com>
To: J Mcvey <ac2eu at yahoo.com>
Cc: ARC-5 List <Arc5 at mailman.qth.net>
Subject: Re: [ARC5] Tip of the day:
Message-ID: <3CA7A6A8-E799-4D49-B4F7-446D0DB7626D at gmail.com>
Content-Type: text/plain; charset=windows-1252
On May 25, 2015, at 4:38 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net> wrote:
> ...I found that a small "70 volt" line transformer used for long runs on Public address amplifiers does a pretty close match with the high impedance output of the ARC5/SCR274 receivers. The 625 mw tap works fine.
> more info here:http://www.crownaudio.com/media/pdf/amps/138905-1_10-05_constant_voltage.pdf
JH,
Thanks for the link to that guide. I assume that it was written by the engineering folks at the makers of Crown amplifiers, which are widely used and respected in industrial, scientific and engineering applications world wide. My quick reading of the guide leads me to believe that the authors really do know what they are talking about.
There have been published a number of tables showing the primary input impedances of line transformers. I have included a table of values below to get folks started without finding the extensive details elsewhere. Note these points:
- The impedance values assume that the secondary of the transformer is loaded with the indicated speaker voice coil impedance - generally 4, or 8, and sometimes 16 ohms.
- If the load impedance is half or double the rated value, changes need to be made to the power handling ability of the unit, and the frequency response will also change
- The *actual* impedance of a speaker can and does vary from perhaps half or less to three times the nominal value, so efforts at precision here will be in vain.
- The quality and power handing capacity of audio line transformers varies quite widely. Examples on hand here include:
- Some transistor output transformers claimed to match 600 ohm radio outputs to speakers. Very small. Likely able to barely manage a half or one watt.
- Midland Model no 25-600 5 watt, 25 volt - likely a modest performer
- Realistic (Radio Shack) Cat No. 23-1031, 10 watt, 70 volt, secondary taps of 4, 8, and 16 ohms. Likely a medium performer, especially at modest power levels.
- A Peerless (Altec Lansing) 70 volt transformer rated at 30 watts - likely a superb performer. At the moment I can?t locate either the transformer or the Peerless data sheet that tells about the series of about 4 such transformers they produced. Rating on these transformers seems to be +/- 1 db from 60 to 15,000 cps at rated power with insertion loss about 0.5 db.
The Hammond company makes a 600 ohm to voice coil transformer (I can?t find it on the AES site just now) that is likely a very fine performer. It is their model 119DA, is rated at 12 watts, and sells for ?less than $40.00?. It is touted as the right thing for use with the R-390 series of radios, which by the way have a rated audio output of one half watt (or thereabouts).
This article:
http://www.radiomuseum.org/forum/audio_transformer_substitutes.html
Is the source for the list of impedances below.
It also includes information about using these transformers as output transformers in both single ended and push-pull configuration.
______________
More on using 70 volt transformers to match impedances. Here is a list of
watts taps verses impedance;
.31watts 14000 ohms
.625w 7000 ohms
1.25 watts 4000 ohms
2.5 w 2000 ohms
5 watts 1000 ohms
10 w 500 ohms
12 watts 360 ohms
24 watts 180 ohms
40 watts 110 ohms
Here is the chart for 25 volt speaker transformers:
.31 watts 1680 ohms
.625 watts 840 ohms
1.25 watts 440 ohms
2.5 watts 220 ohms
5 watts 120 ohms
________________
On a related note, I recently measured the input impedance of a military LS-3 speaker with original matching transformer and speaker. It was very close to the expected 8000 ohms. This speaker was used with the BC-348 and other military radios of the era that typically had output levels on the order of 1 to 5 watts. The transformer in some of these speakers is marked 1 watt, but is the size of the 10 watt unit I mention above.
Roy
Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958
------------------------------
Message: 2
Date: Tue, 26 May 2015 10:03:25 +0000
From: Sheldon Daitch <SDAITCH at bbg.gov>
To: "kgordon2006 at frontier.com" <kgordon2006 at frontier.com>, Leslie
Smith <vk2bcu at operamail.com>
Cc: "ARC5 at mailman.qth.net" <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] BC-455 - intermittant LO.
Message-ID:
<DM2PR03MB3978587FCC8749A4C9DF37CADCC0 at DM2PR03MB397.namprd03.prod.outlook.com>
Content-Type: text/plain; charset="us-ascii"
Similarly, I had an old Spotmaster cart machine which would occasionally fail to stop when the cart recued.
It worked most of the time, so until it quit totally, I never opened it up, but when I did, I found a lead on a transistor on the stop cue sense board which had never been soldered.
A spot of solder cured the problem.
73
Sheldon
-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
Sent: Monday, May 25, 2015 7:23 PM
To: Leslie Smith
Cc: ARC5 at mailman.qth.net
Subject: Re: [ARC5] BC-455 - intermittant LO.
Les:
Concerning your intermittant LO: during a refurbishment of an R-25/ARC-5, I discovered a "no solder" joint in the coil-box, yet the joint had been painted with a dot of red "inspection" lacquer which all other joints had been.
This was a factory fault.
Soldering that joint eliminated the intermittant LO problems I had experienced with that receiver.
Do remember that the LO voltage is quite low. Therefore, any such fault could have more effect that it would in a rig with higher voltages.
Ken W7EKB
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Message: 3
Date: Tue, 26 May 2015 14:10:26 +0000 (UTC)
From: J Mcvey via ARC5 <arc5 at mailman.qth.net>
To: Sheldon Daitch <SDAITCH at bbg.gov>, "kgordon2006 at frontier.com"
<kgordon2006 at frontier.com>, Leslie Smith <vk2bcu at operamail.com>
Cc: "ARC5 at mailman.qth.net" <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] BC-455 - intermittant LO.
Message-ID:
<1589052197.1955437.1432649426574.JavaMail.yahoo at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
These radios have been tinkered with so much over the years that anything is possible:
I had a LO failure due to a mico-shard of metal that got into the LO gang section for plate circuit and shorted it out. This particular gang has b+ for the osc plate on it. I never did see the offending shard, but I was able to blast it out with an air nozzle.
I had to disconnect the gang to verify the short.
On Tuesday, May 26, 2015 6:03 AM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:
Similarly, I had an old Spotmaster cart machine which would occasionally fail to stop when the cart recued.
It worked most of the time, so until it quit totally, I never opened it up, but when I did, I found a lead on a transistor on the stop cue sense board which had never been soldered.
A spot of solder cured the problem.
73
Sheldon
-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
Sent: Monday, May 25, 2015 7:23 PM
To: Leslie Smith
Cc: ARC5 at mailman.qth.net
Subject: Re: [ARC5] BC-455 - intermittant LO.
Les:
Concerning your intermittant LO: during a refurbishment of an R-25/ARC-5, I discovered a "no solder" joint in the coil-box, yet the joint had been painted with a dot of red "inspection" lacquer which all other joints had been.
This was a factory fault.
Soldering that joint eliminated the intermittant LO problems I had experienced with that receiver.
Do remember that the LO voltage is quite low. Therefore, any such fault could have more effect that it would in a rig with higher voltages.
Ken W7EKB
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Help: http://mailman.qth.net/mmfaq.htm
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------------------------------
Message: 4
Date: Tue, 26 May 2015 14:33:36 +0000 (UTC)
From: mstangelo at comcast.net
To: ARC-5 List <Arc5 at mailman.qth.net>
Subject: [ARC5] Spline Wrenches for command sets
Message-ID:
<28553984.25020921.1432650816605.JavaMail.zimbra at comcast.net>
Content-Type: text/plain; charset=utf-8
Which Bristol spline wrenches are used on the Command Set transmitters and receivers?
I picked up some hacked AN/ARC-5 and SCR-284N sets plus of bunch of transmitter capacitors and I want to work on them.
Thanks,
Mike N2MS
------------------------------
Message: 5
Date: Tue, 26 May 2015 10:57:19 -0400
From: Rich Post <kb8tad at gmail.com>
To: "ARC5 at mailman.qth.net" <ARC5 at mailman.qth.net>
Subject: Re: [ARC5] BC-455 - intermittant LO.
Message-ID:
<CAEJr0Fvxj0-7jnaKDq0GHnj9Z0P1PryLNB4mX6vELn2GCF6OKg at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Found a never-soldered resistor in a BC348 affecting the critical output
tube bias.
<http://www.ohio.edu/people/postr/bapix/BC348Q_3.htm>
and here's my saga on a basket case BC342 that finally led to a variable
cap mounting screw that was too long.
<http://www.ohio.edu/people/postr/bapix/BC342.htm>
Factory defects are not a new phenomenon.
Rich KB8TAD
On Tue, May 26, 2015 at 10:10 AM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:
> These radios have been tinkered with so much over the years that anything
> is possible:
>
> I had a LO failure due to a mico-shard of metal that got into the LO gang
> section for plate circuit and shorted it out. This particular gang has b+
> for the osc plate on it. I never did see the offending shard, but I was
> able to blast it out with an air nozzle.
> I had to disconnect the gang to verify the short.
>
>
>
> On Tuesday, May 26, 2015 6:03 AM, Sheldon Daitch <SDAITCH at bbg.gov>
> wrote:
>
>
> Similarly, I had an old Spotmaster cart machine which would occasionally
> fail to stop when the cart recued.
>
> It worked most of the time, so until it quit totally, I never opened it
> up, but when I did, I found a lead on a transistor on the stop cue sense
> board which had never been soldered.
>
> A spot of solder cured the problem.
>
> 73
> Sheldon
>
>
> -----Original Message-----
> From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Kenneth G.
> Gordon
> Sent: Monday, May 25, 2015 7:23 PM
> To: Leslie Smith
> Cc: ARC5 at mailman.qth.net
> Subject: Re: [ARC5] BC-455 - intermittant LO.
>
> Les:
>
> Concerning your intermittant LO: during a refurbishment of an R-25/ARC-5,
> I discovered a "no solder" joint in the coil-box, yet the joint had been
> painted with a dot of red "inspection" lacquer which all other joints had
> been.
>
> This was a factory fault.
>
> Soldering that joint eliminated the intermittant LO problems I had
> experienced with that receiver.
>
> Do remember that the LO voltage is quite low. Therefore, any such fault
> could have more effect that it would in a rig with higher voltages.
>
> Ken W7EKB
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> ARC5 mailing list
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> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
------------------------------
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