[Heath] Replacing dial lights with LEDS in SB-102

[G3OOU at aol.com]

Hi Joe
 
I cannot advise on the LEDs but one of the pilot lamps (#47) is from  the 
6.3v rail to chassis so if you remove that you will unbalance the two series  
connected 6.3v rails. The other two pilot lamps (#1815) are only across the 
 12.6v line so they are not a problem.
 
You will need to provide a resistor equal to the hot resistance of the #47  
bulb to make the two 6.3v rails the same. Alternatively you can experiment 
with  low value resistors to see what is required to balance the two rails.
 
You can use white or yellow series connected LEDs running from the 12.6v  
heater rail with a series rectifier diode and a current limiting resistor. 
You  may not need to smooth the supply to the LEDs unless you can see any 60Hz 
 flicker which is possible but unlikely.
 
73

Bob

Bob F Burns G3OOU,  G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: www.qsl.net/g3oou  

 
In a message dated 03/01/2017 14:40:17 GMT Standard Time,  
heath at puck.nether.net writes:

 
I have posted this question once  before about replacing the dial lights 
with LEDS got a few suggestions.


One was using LEDS from the  Superbrightleds company.  They make a great 
product.


Unfortunately for me the LEDS I  purchased do not project the light in the 
right direction towards the  plastic


circular dial.   These LEDS shine the light straight out and in the SB-102 
that is down not at  the circular dial.


Has anyone used a  different LED from this company that projects the light 
at a 90 degree angle  which would be



pointing at the edge of  the circular dial.  If so what color did you use?  
Was it Cool or  Warm?


I see a few on there  website that may be what I need but I want to make 
sure it could be used  successfully


because those I purchased  are not what I needed.


I did interact with there  technical people but not sure if they understood 
what I wa_nted to do.


Any suggestions as I dont  want to modify the SB-102 as I built it in 1972 
and want to keep it  stock.


73  Joe  WA3CKA








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