"Nutcase Kook"

Peavey Prowler amp from 1999. All the 1/4 inch sockets and one , only, of
the valve bases , bad solder joints, reacted to the re-soldering process
as
though the tags were made of stainless steel or had a grease/oil film over
them. What could have been the cause?


** Bad plating on the parts.

Jack sockets and valve base pins are generally nickel plated, which is very
shiny, corrosion resistant and solders easily.
However, if the plating solution is contaminated by zinc or other metals -
then the result is dull and not corrosion resistant for long.

Peavey may have been supplied such parts ( eg from China ) and installed
them on the PCBs when right on the edge of being usable - and now they are
unusable.

Anecdote:

I bought some Neutrik Speakon PCB mount sockets from the Australian agent
last year. What I got may have been old stock and the solder tags were all
but impossible to solder. Had to scrape every one with a blade and apply
humongous amounts of heat and extra solder to get a result.


..... Phil