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Antique Radio Technical Forum

Posted by Lewis L on 03/29/2009 18:16

::Can anyone tell me what is the best solder to use on a 50's circuit board radio. I am afraid of burning the circuit board. I have used on AA5's (Radio shack .050 dia/1.5 oz/---63/37).
::Thank you,
:I forget exactly what the exact mixture is but there is an alloy that is something oddball like 57/43 or something like that that goes from liquid to solid without going through a "paste" phasse, thus lowering the possibility of "cold" solder joints. I havn't bought solder since I first went to work, as it semed to follow me home. That is the best IMHO.

From Wikipedia:

At the retail level, the two most common alloys are 60/40 Sn/Pb which melts at 370 F or 188 C and 63/37 Sn/Pb used principally in electrical work. The 63/37 ratio is notable in that it is a eutectic mixture, which means:

It has the lowest melting point (183 C or 361.4 F) of all the tin/lead alloys; and
The melting point is truly a point not a range
At a eutectic composition, the liquid solder solidifies as a eutectic, which consists of fine grains of nearly pure lead and nearly pure tin phases, but in no way is it an intermetallic, since there are no tin/lead intermetallics, as can be seen from a tin/lead equilibrium diagram.[1]

Vinny 03/29/2009 13:19 
Lewis L 03/29/2009 17:00 
Lewis L 03/29/2009 18:16 
Mike C. 03/29/2009 18:19 
Vinny-Thank you guys! 03/30/2009 08:27 
Lou 03/30/2009 08:51 
vinny 04/01/2009 14:45 
Anthony Bitetto 04/01/2009 17:15 
Dave A. 04/13/2009 22:31 
Doug Criner 04/14/2009 18:28 
Vinny 04/16/2009 01:36 

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