Guide to replacing Signal meter bulbs with LED's

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Admiral
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Re: Guide to replacing Signal meter bulbs with LED's

Postby Admiral » 14 Jul 2016, 17:02

PLL02A wrote:
Admiral wrote:The only issue I've found is that with older HF kit, whilst the dimmer made a big difference on the old lamp installation, with replacement LEDs the dimmer button is virtually useless as there is no noticeable change in brightness.


Well you could muck about and switch in different values of resistors, But far as i'm concerned a dimmer function on a radio is pretty useless anyhow.


Absolutely agreed, just saying as this is a sticky and could be here for the next 300 years. If you have an older set next to your bed, the old fashioned dimmer that drops from 12v to 8v will work a treat with the old rice grain lamps, but an LED will pump out virtually as much light with the same +vcc drop.
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Buick Mackane
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Re: Guide to replacing Signal meter bulbs with LED's

Postby Buick Mackane » 14 Jul 2016, 17:12

Mudslinger wrote:You don't have to diffuse them, I have found it makes very little difference.



Iv'e never used an undiffused LED, So i cant make any comparisons, Only going by what iv'e read online, I just fitted one in my tiger that i diffused with sandpaper, And although one side is slightly brighter than the other its a vast improvement over the old filament bulb, It was that dim it almost went out when i keyed up.

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26CT1862
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Re: Guide to replacing Signal meter bulbs with LED's

Postby 26CT1862 » 28 Sep 2016, 06:56

Mudslinger wrote:You don't have to diffuse them, I have found it makes very little difference.



It's positioning that matters more. Don't point the LED at the front of the meter... point it up, and let the reflected light diffuse around the meter housing. It's also not as stupidly bright if you do this.
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k40
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Re: Guide to replacing Signal meter bulbs with LED's

Postby k40 » 05 Oct 2016, 09:14

PLL02A wrote:
Mudslinger wrote:You don't have to diffuse them, I have found it makes very little difference.



Iv'e never used an undiffused LED, So i cant make any comparisons, Only going by what iv'e read online, I just fitted one in my tiger that i diffused with sandpaper, And although one side is slightly brighter than the other its a vast improvement over the old filament bulb, It was that dim it almost went out when i keyed up.

Image

That looks like a small sun :D

Tim
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Re: Guide to replacing Signal meter bulbs with LED's

Postby Tim » 05 Oct 2016, 16:54

You'll soon get sick of it and put in a proper bulb, you'll then see what the meter is doing once again.

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theEarwigger
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Re: Guide to replacing Signal meter bulbs with LED's

Postby theEarwigger » 05 Oct 2016, 18:35

A last thought from me -
As most radios have 12v supply it's better to put 3 LEDs in series to help efficiency. 3 of them also helps diffuse bright spots.
The 5mm LED format has been left far behind now in efficiency terms.

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Re: Guide to replacing Signal meter bulbs with LED's

Postby Tim » 05 Oct 2016, 19:50

Don't like these LED's in a signal meter, almost like looking directly at the sun.

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Mudslinger
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Re: Guide to replacing Signal meter bulbs with LED's

Postby Mudslinger » 05 Oct 2016, 20:36

Tim wrote:Don't like these LED's in a signal meter, almost like looking directly at the sun.



I bet you couldn't tell the difference if its done correctly with a warm white LED.

The one above only looks bright because the radio was in a relatively dark setting when the picture was taken and the flash wasn't being used.

It is a trick of the camera.
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Re: Guide to replacing Signal meter bulbs with LED's

Postby Tim » 05 Oct 2016, 21:12

Sorry but still don't like them. :thumbdown:

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johnkyrle
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Re: Guide to replacing Signal meter bulbs with LED's

Postby johnkyrle » 03 Jan 2017, 21:25

For posterity and for the benefit of our future users of Legacy radio's,go easy with the L.E.D's.Save money in the house on electricity but on a classic rig?NOOOOOOOOO!!!!!!!!!


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