[GreenKeys] Model 28 Light bulbs - LED replacements?

Thu Mar 23 19:39:31 EDT 2023

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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>     >>> 2002-to-present greenkeys archive:
>     http://mailman.qth.net/pipermail/greenkeys/
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>
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>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
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