[GreenKeys] Model 28 Light bulbs - LED replacements?

Bruce Gentry ka2ivy at verizon.net
Thu Mar 23 20:02:41 EDT 2023 

The double contact base is what will make finding LED replacements 
difficult. How about using epoxy and insulating tubing to turn the 
double contact base of a bad bulb into an adapter for the small single 
contact socket that will accept a #47 LED equivalent? A good lower cost 
source for 6 volt LEDs to replace #47 lamps is Ebay. Look for "pinball 
machine bulbs". You could also solder leads to the base of the LED bulb, 
put them through the double contact, base, solder them, and then steady 
the LED bulb with silicone caulk. I have done it both ways on a variety 
of equipment. For the 60 or 120 volt lighting circuits, look into LED 
appliance bulbs. They are a little pricey, but bargains can be found.

    Bruce Gentry, KA2IVY


On 3/23/23 19:39, John, W9DDD wrote:
>
> Be careful about the 60 volt, that's mostly used for the margin or EOL 
> indicator.  But, there might be some 28s out there with the two 60 
> volt in series for the copy lights.  It would likely be a rare bird 
> though I would think. Then there were the ones with fluorescent lamps 
> and the 48 volt (for central office operation along with a 48 volt 
> motor) versions as well.
>
> But, for most 28KSRs it's #82 for copy lights with either a 6 volt 
> transformer with a dropping resister (10 or 100 ohm?) or a 5.5 volt 
> transformer. And the EOL lamp is the 60 volt lamp with a 700 ohm 
> resistor in series for 120 VAC supply.  I don't think I've ever 
> discovered the OEM number for it.  I find it interesting that the ASR 
> has a 6 volt EOL  lamp operated from the 6 volt supply, but never 
> evolved into that configuration for the KSR.
>
> I've bought a box of each on eBay.  I didn't think the prices were 
> that bad.
>
> As for LEDs, I could never find ones for 6 volts, 12 or 28 maybe.  I 
> wonder what a 12 would do with only 5.5 volts as a source?  Also they 
> weren't cheap.
>
>
> ---
> ----
> You said "tomorrow" yesterday.
>
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
> On 3/23/2023 5:31 PM, Jeff G wrote:
>> A number I got off the ones on the ship were GE #82, 6v bulbs. I find 
>> it odd that they have dual contacts on the bottom while the originals 
>> were just single filament bulbs (I think). The ones you linked show 2 
>> filaments, which could be similar to a 1154 (6v dual filament like 
>> for a taillight).
>>
>> I see some on Ebay but they want $11 shipping for a pack of bulbs. 
>> Part of why I'm asking, is because it would be really cool to light 
>> up some of the other machines in the room, even if they aren't in 
>> use. (There's a couple waterfalls in there too, that I'm assuming 
>> likely use the same bulb). I thought I did good finding a bunch of 
>> bulbs in the parts units, only to find they were ALL burnt out LOL.
>>
>> Jeff
>>
>> On Thu, Mar 23, 2023 at 6:25 PM tony j. podrasky 
>> <tony.podrasky at gmail.com <mailto:tony.podrasky at gmail.com>> wrote:
>>
>>     GA OMs;
>>
>>     Well - the life of these bulbs are pretty good.
>>
>>     But if someone can get a good quantity deal on them, at a
>>     reasonable price I'd be interested in taking 2-4.
>>
>>     73,
>>
>>     K2EAA - tony
>>
>>     NNNN ZCZC
>>
>>
>>     THIS is what I found during a search for the bulbs:
>>
>>
>>     <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj9npCki_P9AhUgHjQIHfNaBZEQFnoECBEQAQ&url=https%3A%2F%2Fwww.ebid.net%2Fus%2Ffor-sale%2Fteletype-corp-pn-153400-light-bulb-6-watt-60-volt-dual-contact-bayonet-base-nos-194952753.htm&usg=AOvVaw2O0rPLcvivu2i62WJeSRMw>
>>
>>
>>           Teletype Corp PN 153400 Light Bulb 6 Watt 60 Volt Dual ...
>>           <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj9npCki_P9AhUgHjQIHfNaBZEQFnoECBEQAQ&url=https%3A%2F%2Fwww.ebid.net%2Fus%2Ffor-sale%2Fteletype-corp-pn-153400-light-bulb-6-watt-60-volt-dual-contact-bayonet-base-nos-194952753.htm&usg=AOvVaw2O0rPLcvivu2i62WJeSRMw>
>>
>>     eBid
>>     https://www.ebid.net› for-sale › teletype-corp-pn-153...
>>     <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj9npCki_P9AhUgHjQIHfNaBZEQFnoECBEQAQ&url=https%3A%2F%2Fwww.ebid.net%2Fus%2Ffor-sale%2Fteletype-corp-pn-153400-light-bulb-6-watt-60-volt-dual-contact-bayonet-base-nos-194952753.htm&usg=AOvVaw2O0rPLcvivu2i62WJeSRMw>
>>
>>     bulbs for teletype machine from www.ebid.net
>>     <https://www.ebid.net/us/for-sale/teletype-corp-pn-153400-light-bulb-6-watt-60-volt-dual-contact-bayonet-base-nos-194952753.htm>
>>     /Teletype/ Corp PN 153400 Light /Bulb/ 6 Watt 60 Volt Dual
>>     contact Bayonet Base NOS ; Condition · Unused ; Brand ·
>>     /TELETYPE/ ; Quantity · 2 items ; Views · 2728 ; Location ...
>>     CA$10.00 · ‎3-day returns
>>
>>     ---------------------------------------------------------------
>>
>>     On 03/23/2023 3:14 PM, Jeff G wrote:
>>>     Does anyone know of a replacement for Model 28 document bulbs,
>>>     preferably warm white (simliar to original) but LED? I know I
>>>     can search for the bulbs (and see a few) but I figured I'd ask
>>>     here if anyone has tried any yet? These seem pricey!
>>>
>>>     Jeff KC3GJX
>>>
>>>
>>>
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>>
>>     -- 
>>     There is nothing that warms the heart so, as
>>     gazing at your dog, who is sleeping on the
>>     couch, mentioning his name, and hearing
>>     thud-thud-thud as his tail hits the cushions.
>>                                 - Tony J. Podrasky
>>
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>>
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>
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