[MRCA] Need Burned out R1051 Dial Lamps

[Daniel Jones]

You’re telling me, especially the one that’s behind the encoder board, what’s interesting is the URC-35 (RT618 Transceiver) which was designed around the same time has bulb access from the front and uses regular 327 bulbs.




Daniel Jones (K6YIC)
DJones at k6yic.com
http://K6YIC.com
HH Phone #11973
SKCC#28598
CCA# AC20-13565




> On Feb 2, 2025, at 09:34, Edward Larsen <ki6rcm98 at gmail.com> wrote:
> 
> At the Navcommsta Diego Garcia receiver site in 1981 we had about 30 R-1051 receivers.  We'd stock the small bulbs by the case.  Not a good illumination design. 
> 73
> KI6R, Tucson
> 
> On Sun, Feb 2, 2025 at 9:55 AM Daniel Jones <djones at k6yic.com <mailto:djones at k6yic.com>> wrote:
>> Good Morning,
>> 
>> I am working on a solution for the R1051 dial lamp issue (Early models that need the bulb replaced from the back not on the front).  The Manufacturing of these bulbs has stopped pushing the prices on auction sites to $50 each (Not great for a bulb that doesn’t last long).  
>> 
>> I have found a solution of replacing the bulb in an old burned out socket with a warm white LED and changing out the resistors on the power supply PCB to lower the voltage to 3v.  I have been running a test on one that I created on the bench and it has been running for couple weeks nonstop at 28v.  
>> 
>> I figure this mod should cost roughly .50 in parts and about 15 minutes of my time to create the bulb and another 15 minutes to swap the resistors on the PCB.  I am not ready to call it perfect yet and tell people I will fix their bulbs also, I need to do a couple more to perfect the method so you wouldn’t get shoddy work back.
>> 
>> 
>> Needless to say I need your burned out bulbs and if anyone has a pile of them and is willing to send me a few I would be grateful.  This could solve a problem for all of us that have R1051s/T827 ect…
>> 
>> 
>> Thanks,
>> Daniel
>> 
>> 
>> 
>> Daniel Jones (K6YIC)
>> DJones at k6yic.com <mailto:DJones at k6yic.com>
>> http://K6YIC.com <http://k6yic.com/>
>> HH Phone #11973
>> SKCC#28598
>> CCA# AC20-13565
>> 
>> 
>> <PastedGraphic-2.tiff>
>> 
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