Ludlum Model 9

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Andrew Robinson
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Ludlum Model 9

Post by Andrew Robinson » Thu Sep 11, 2014 7:33 am

Well I finally decided to resurrect the old Ludlum Model 9 and give it its day in the sun. Like many of these hand helds, someone left the batteries in too long. I acquired this one after the fact so I cannot be held accountable or scoffed at haha. At any rate though, it only seemed fitting to give this little guy the full make over. So, without further ado, here is the process thus far...
1.jpg
Meter before disassembly.
2.jpg
Battery compartment.
3.jpg
Analog meter.
4.jpg
Base removed. Notice the speaker cable was torn off. I don't know how the previous owner missed the pin header on the main board...
5.jpg
Side view board close up.
6.jpg
Underside sliding window.
7.jpg
Faceplate disassembled.
8.jpg
Close up of battery compartment.
9.jpg
Back side of faceplate.
10.jpg
Battery lid top.
11.jpg
Battery lid bottom.
12.jpg
Calibration shield.
13.jpg
New silkscreen test printout.
14.jpg
Base side.
15.jpg
Base top.
16.jpg
Base bottom.
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Andrew Robinson
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Re: Ludlum Model 9

Post by Andrew Robinson » Thu Sep 11, 2014 7:40 am

All cast parts now cleaned up. New paint and touch ups tomorrow in preparation for heading out for silkscreen.
17.jpg
Most of the mechanical components either waiting for paint or reassembly.
18.jpg
Closeup of the faceplate now completely cleaned up.
19.jpg
Base completely cleaned up.
20.jpg
Inside base.
21.jpg
Base window and phenolic.
22.jpg
Battery lid cleaned up.
23.jpg
Some of the electrical components.
24.jpg
Desiccant container with capsules needing reactivation.
25.jpg
Main circuit board.
26.jpg
Organized chaos.
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Re: Ludlum Model 9

Post by Andrew Robinson » Thu Sep 11, 2014 7:44 am

Here are the silk screen templates I created to reproduce the front panel. They are to scale.
Template Base.jpg
Faceplate silkscreen.
Template Lid.jpg
Battery lid silkscreen.
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Richard Hull
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Re: Ludlum Model 9

Post by Richard Hull » Thu Sep 11, 2014 8:04 am

Completely over the top on this effort. I have never seen this done. I woulda' cleaned/replaced the contacts sanded the battery box and shot a little paint over the sanding work in the box and that would have been it. I have restored many, many counters of all types over the years, but never went to this length. Great job!

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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Re: Ludlum Model 9

Post by Andrew Robinson » Fri Sep 12, 2014 6:17 am

Anything that's worth doing is worth over doing :)

Still waiting on humidity to drop to a more acceptable level for first coat of paint. Decided on a silver hammered look. Should be a great choice to contrast with all the black. I am a little sad about the tan though. I have always had a love hate relationship with Ludlum tan. Ultimately I decided not to try to replicate it. It just wouldn't come out right. The hammered silver will be really nice. More updates soon once humidity drops (Hate painting inside shop). Thanks for the praise Richard.
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Re: Ludlum Model 9

Post by Andrew Robinson » Mon Sep 29, 2014 10:11 am

So after two paintings... Yes... two separate. I screwed up the first try (at least by my standards) and had to re-sandblast EVERYTHING haha. Second attempt came out more to my liking. I finally decided against silkscreen. While its a really easy process and I have a shop that sends out parts for silkscreen sometimes twice a week, I just opted to hold off for now. I'm actually going to pass this little guy onto someone else who needs it. I have no use for this meter, but it was fun to breathe some new life into it for someone else to cherish for many years to come. Here are the final assembly pictures. The only thing I didn't do was silkscreen and replace the pin for the door. Both are very easy fixes though. I'm going to put it up on eBay if anyone here is interested. You should know about a few problems before bidding though:

1. I already said, I did not silkscreen it, however I will provide all the artwork I made to have it silkscreened.
2. The meter needle was broken initially. Since it was hanging by a thread I went ahead and snipped it so it looks much better. Still readable (see pictures)
3. The battery cover pin corroded away and was subsequently snipped flush. It needs to be pushed out and replaced, or you could throw a Velcro strap around the whole thing to hold together. Your choice.

That's it! Everything else is in PRISTINE condition. Brand new desiccant too!

Lots of pictures to follow:
27.jpg
Base with window reattached
28.jpg
Base with window reattached (Phenolic slide open)
29.jpg
Second time around with paint I opted to keep the sandblasted finish on the inside. Actually looks much cleaner this way.
30.jpg
Sandblasted interior. Starting reassembly.
31.jpg
Newly painted front face. Isn't it perty :)
32.jpg
Adding electronics
33.jpg
Connecting Ion Chamber
34.jpg
Ion chamber mounted back in place
35.jpg
New DRICAPs sealed up
36.jpg
Old indicating DRICAP completely used up. I could not reactivate them. They were so saturated that following the manufactures procedure for reactivation caused them to balloon and explode. Had to purchase replacements.
37.jpg
Old next to the new. They're smaller, but I made sure to optimize the space in CAD first before placing order for specific size.
38.jpg
New DRICAPs fit in perfectly.
39.jpg
DRICAPs attached to chamber.
40.jpg
Look inside new battery compartment. There was quite a bit of pitting in the aluminum, but it still came out ok. Shiny like new terminals in bottom :)
41.jpg
Meter face without cover
42.jpg
Meter face with cover reinstalled. Touched up paint on all black hardware too.
43.jpg
Found a nifty shoulder strap in a closet not being used
44.jpg
Just another view
45.jpg
Yet another view
46.jpg
Shiny latches
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Re: Ludlum Model 9

Post by Andrew Robinson » Mon Sep 29, 2014 10:16 am

Last few images. I'll post the eBay link here soon too...

eBay link: http://www.ebay.com/itm/141422893885?ru ... 26_rdc%3D1
eBay item: 141422893885

Last thoughts. I have not officially tested this other than battery test. Sorry, don't have any sources right now. Selling for a great price as is. Sounds like its good to go though. Battery test is solid, and meter clicks away initially as the chamber stabilizes. The characteristic change in pitch feature is noticeable too. Up to you though. Everyone here should be smart enough to work on these things if you discover a problem I haven't noticed. Cheers
47.jpg
More shiny latches
48.jpg
Underside of battery cover
49.jpg
Battery cover detached
50.jpg
One last shot showing battery test successful.
Last edited by Andrew Robinson on Mon Sep 29, 2014 11:35 am, edited 1 time in total.
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Andrew Robinson
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Re: Ludlum Model 9

Post by Andrew Robinson » Mon Sep 29, 2014 10:45 am

Last thing... promise. Here is the manual (little newer, but still for the Model 9)
Model 9.pdf
Manual
(2.17 MiB) Downloaded 125 times
Also, here are the original scans of the parts, the new template images.
Silkscreen.zip
Silkscreen Exported Images
(967.97 KiB) Downloaded 109 times
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Richard Hull
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Re: Ludlum Model 9

Post by Richard Hull » Mon Sep 29, 2014 5:44 pm

Wow! Will you ever get you money and time out of this effort? I figure 2 grand ought to cover it. See you in a few days.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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Andrew Robinson
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Re: Ludlum Model 9

Post by Andrew Robinson » Mon Sep 29, 2014 5:56 pm

Haha, hear that everyone? Got the RH stamp of approval :)

See ya soon! Cant wait to dive through some NIM modules.
I can wire anything directly into anything! I'm the professor!

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