Look into a product called ChipQuick. http://www.chipquik.com/
It is a solder alloy with a low melting temperatue. When applied to a
normal solder joint, below the normal solder melting temp, it causes the
existing solder to also melt at about 150 degrees and stay melted long
enough to remove multi-pin devices. The video is a good overview. This
stuff is rapidly taking place of regular desodlering equipment in rework
situations. Not inexpensive but a little goes a long way.
Curt
KU8L
On 11/1/2011 8:53 AM, Bob Spooner wrote:
Paul,
Both the lead-free solder and especially the silver solder require higher
temperatures (maybe high-temperature flux as well?) to create a proper
solder joint. This makes soldering without damaging a component or PC board
trace more difficult. An ESD soldering iron with temperature control is a
necessary tool for RoHS compliant work. But I wouldn't want to try to work
on my TR7A without an ESD soldering iron either. For tube gear it isn't a
problem.
73,
Bob AD3K
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Paul Christensen
Sent: Tuesday, November 01, 2011 9:08 AM
To: [email protected]
Subject: Re: [Drakelist] OT a failure mode of solid state electronics
A consequence of RoHS compliance. The problem has already been documented
with N8LP's LP-100 display board (PLED version). Display segments begin
failing, one-by-one until the display becomes very difficult to read. Not
sure if there's been any recent developments concerning chemical or process
improvements to lessen the severity of the "whiskering."
I have spools of Kester clean solder, and a spool with 2% silver -- neither
of them flow very well. I'm inclined to stay with Kester 44 60/40 solder
from this point forward.
Paul, W9AC
----- Original Message -----
From: "Bob Spooner"<[email protected]>
To: "'Ron'"<[email protected]>;<[email protected]>
Sent: Tuesday, November 01, 2011 8:47 AM
Subject: Re: [Drakelist] OT a failure mode of solid state electronics
Ron,
Vintage radios were made with regular leaded solder so they don't have
that
problem (unless you repair them with lead free solder.) It's the new rigs
that I'm concerned about. Tin whisker growth under surface mount
components
would be very difficult to detect and remove. So keep your vintage Drake
radios operational and you won't be without a rig if the new one fails.
73,
Bob AD3K
-----Original Message-----
From: [email protected]
[mailto:[email protected]]
On Behalf Of Ron
Sent: Monday, October 31, 2011 6:46 PM
To: [email protected]
Subject: [Drakelist] OT a failure mode of solid state electronics
All,
I was tooling around the web and ran into this video and document. For
those unfamiliar, the new lead free solder often has a higher tin content
and can causes tin whisker growth issues. Who knows when it might strike
your beloved solid state or hybrid vintage radio. Maybe we should all
return to hollow state :-)
http://www.vintage-radio.info/whiskers/
Totally amazing IMO.
73,
Ron WD8SBB
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