Hi Guys,
Didn’t know where else to post this one.
This is a Waltham Aircraft 8 days clock in tip-top shape. Instead of the white incandescent light, I’d like to install a red LED one. How? What parts do I need? I’d like to use the existing plug for powering it … I’ve got loads of batteries and can solder. I’d like to go for long running. Doesn’t need to light up the room. Cheers!
Are you using this in a working aircraft? Figure out what the electrical system is delivering first.
Then buy a driver that accepts that as input, assuming it’s available. Put a red emitter on the output of the new driver, in place of the existing bulb.
I’m assuming you can take the clock apart far enough to get at that. And assuming you want to take it apart.
Is part of the problem turning off an original white incandescent light built into it?
If not, look up one of the ways to light it up from an external source:
https://www.google.com/search?q=site%3Abudgetlightforum.com+“piss+light”
Sorry, no. It’s my night stand clock in the bedroom. I’m attached to it ’cause it’s a gift from my late mother.
Once I know how to mod it to red LED, will have a housing made to accommodate the mods.
Can’t be used in an aircraft if it’s altered except as an auxiliary instrument- primary and/or required instruments must be certified and left as-built. Would make a really cool man-cave clock though :+1:
Look up the part number which should tell you the operating voltage then you’ll know which drivers can be used.
Phil
Hi Phil,
Gonna use it as bedroom night clock. A13A/L (MC).
Never used yet fully revised by a qualified US Airforce clockmaker in 1988 
If you look at the link it appears to run on 5V AC or DC and already has a red lighting. It would need red lighting for night operation so that the pilots night vision is not affected.
http://www.walthamclocks.com/a13a-l.html
Bob
Check the library to see if you can find it here:
Military Timepieces by Marvin E. Whitney Page 29 Waltham Aircraft Clock-Type A13A Model 22322-S-ET-12- 8 Day 22 Size- 22 Jewels.
Instructions for servicing/disassembly,cleaning etc. Hope this info helps you.
I feel not you might also try contacting Waltham directly for the schematic/wiring.
As I said above you should not need any modifications you likely just need to power it correctly.
Bob
Looks like its mechanical,
If it is a 5v light then maybe use a usb wall wart to go from 120v to 5v then just make connectors for your two needed pins. bingo red clock at home.
Maybe rig a switch on the housing so you can turn the light off and on (I don’t now how long thee “red” light will last)
With one-hour elapsed time feature and sweep hand. The start, stop and flyback of second and minute hands does not disturb time of day. The lever for adjusting rate is accessible without removing the clock movement from its case. Clocks contain an unbreakable, anti-magnetic cobalt alloy mainspring and an anti-magnetic temperature compensated hairspring to ensure accuracy. Mechanical clocks are stand-alone, time keeping instruments which are not affected by environmental extremes or system failure.
Waltham clocks can be provided with custom lighting configurations to match instrument panels and with special dials to meet specific requirements.
Case: Dust and moisture-proof aluminum. Lusterless black color 37038 or Federal Standard 595.
Jewels: 20-five more than required by military specifications to ensure accurate performance.
All Waltham mechanical aircraft clocks are domestically produced and are certified to conform to FAR # 52.208-1. They contain jewels produced by MICROLAP Technologies Wm. Langer Jewel Bearing Plant.
Spare or replacement parts available
Operation and Installation
Clocks are furnished with standard 2 inch aircraft instrument case. Instrument panel cutout required as shown on the drawing, together with view of the mounted clock showing interference dimensions in depth. Two mounting screws and two Tinnerman nuts are available upon request. For mounting with flange behind instrument panel, screws are secured to Tinnerman nuts inserted into mounting holes in clock. For mounting with flange in front of instrument panel, screws are secured to locknuts provided in instrument panel.
When locating, allow sufficient space for projections shown on drawing. To wind clock, rotate winding knob in a clockwise direction until a stop is reached.
To set clock, pull winding knob out and rotate as required to set time of day hands. Knob will return to winding position when released.
Lighting
Connector: 67-02E12-60P
Custom Connectors Available
Wiring
Pin 1- Common Ground
Pin 3- Red Lighting
Now that’s strange.
I once attached it to power and the light was white always, not red. Otherwise I wouldn’t have posed this question.
The bulb could be burned out or not hooked up correctly. More information would be needed to know for sure.
Bob
— from the page linked above
So you may have anything someone wanted
And that may mean you can change what’s inside.
Ask’em.
Thanks everyone!
Gonna contact Waltham! I’m so stupid, didn’t even realize they still exist :student: . Will be lightbulbs I gather but perhaps can mod myself …