Suggestions for VT103?
Jerome H. Fine
jhfinedp3k at compsys.to
Sun Dec 28 20:39:02 CST 2008
>Ethan Dicks wrote:
>>On Sun, Dec 28, 2008 at 5:20 PM, Josh Dersch <derschjo at mail.msu.edu> wrote:
>>Also, just to satisfy my curiosity -- it's been mentioned by several people
>>that lead-based solder is necessary -- why is this?
>Because the equipment was made with lead-based solder (being many,
>many years older than the RoHS directives), and mixing lead-free and
>lead-based solder is not a good idea. I'm sure someone here can quote
>chapter and verse, but AFAIK, you'll get unreliable solder joints if
>>(I think I have a spool
>>of it somewhere that I liberated from my grandfather's basement some years
>>back, but I'll have to dig it up...)
>If that's plumbing solder, you are unlikely to get good results.
>Really, really old plumbing solder _is_ lead-based, but most of what
>you are likely to find is not (so that it's safe to use on supply
>lines). Plumbing solder is also frequently acid-cored or fluxless. I
>don't recall running into any plumbing solder that is compatible with
>Now...if your grandfather was a Ham or did electronic repairs, what
>you have might be just perfect, but be sure you have the right stuff
>before you get started.
>What you are after is rosin-core lead-based solder around 60/40 or
>63/37 tin/lead, with a diameter around 0.5mm (.020") to 0.8mm (.032").
> The exact ratio of lead to tin is not critical, nor is the exact
>diameter, but since you aren't doing ultra-fine work or trying to
>solder down something huge and heavy, like bundles of power-supply
>leads or RF cages, I'd recommend something "medium" weight, like the
>There should be a label on one end of the spool (if it's still on the
>original spool) describing the various characteristics. If you aren't
>practiced at making good joints, I'd recommend getting an inexpensive
>electronic hobby kit to practice on. My earliest efforts from when I
>was in Jr. High are rather ugly - by the time I was adding blue wires
>to $2000 boards at work five years later, I'd gotten much, much better
>from the early practice.
Very helpful - thank you!
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