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 Post subject: Edge lit dial hint
PostPosted: May Mon 22, 2017 4:42 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17239
Location: Warner Robins, GA
For those who deal with radios that have an edge lit dial and the original material used to block the light from going behind of or in front of the dial has disintegrated or otherwise became unusable here's a solution.

Black double sided tape.

Either stick to the dial or the chassis leaving the backing on the tape to facilitate easy dial glass removal should that be necessary and use however many layers is required to provide a good seal between the dial glass and chassis.

Here's an example.

Image

Notice how the light only shines through the dial glass edge and not in front of or behind it.

Also notice at the bottom of the picture how any smudges, dirt, oils ETC... from handling the dial scale are visible given it causes a spot of light to be seen where the contamination is.


Here's a picture showing how it was done.

One layer of tape in front of and behind the dial.

Image

If necessary the backing can be removed on the rear layer of tape if it is desired to hold in the dial glass more securely.

This example is with LEDs, but will work just as good with regular incandescent bulbs as well.



Another tip for edge lit dials when desired to convert to LED is to get the LED fuse lamps. Once the end caps are desoldered and removed, you then have a circuit board with three LEDs on it, a dropper resistor and a rectifier which can be placed right against the dial's edge then epoxied in place and run directly off the 6.3Vac heater voltage using a dropping resistor in series with the bulb to keep the dial as bright as it was originally, brighter if it was a little too dim stock or dimmer if it was too bright stock.

Here's how it was done. A little double sided tape on the PC board holds the LEDs to the dial and allows for final positioning before epoxying them in place.

Image

The LED boards are small and thin so if you run into an issue where only one dial lamp is used and the dial isn't evenly lit you can do like I did and place a LED board at the other end of the dial.

If you notice looking at the first picture there is a small problem doing it this way. That is if there are any dial glass holders on the side of the dial glass and they are not near the bottom or top side of the dial glass it may be in the way of mounting the LEDs properly and as seen in my example it affects the lighting of the dial where MC isn't as brightly lit as the rest of the dial.


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 Post subject: Re: Edge lit dial hint
PostPosted: Aug Fri 11, 2017 2:10 pm 
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Joined: Jun Wed 28, 2017 9:17 pm
Posts: 5
Great post.... Except that the photos aren't being displayed. Each one has been replaced with a message that says to " upgrade your account" and then shows a link to Photobucket. A lot of the posts on this site are showing that message.


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 Post subject: Re: Edge lit dial hint
PostPosted: Aug Fri 11, 2017 7:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17239
Location: Warner Robins, GA
Yes.

Photobucket did indeed muck up a lot when they started making third party hosting a paid for feature.

I can figure out the photos I posted and upload them directly to the post some time tomorrow.


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 Post subject: Re: Edge lit dial hint
PostPosted: Aug Fri 11, 2017 8:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10664
Location: Mpls, Minnesota
Click on the "Image' here in the post which takes you to the photo site, then right click on the "image" and open in a new tab, picture will be there.

Dave


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