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<blockquote data-quote="John Roberts" data-source="post: 121609" data-attributes="member: 126">Re: Peavey IPR2 amps?Tin whiskers have been known about since the &#039;40s. They have re-emerged as an issue due to ROHS, lead-free solder requirements mainly for EU countries, but the electronics manufacturing industry has pretty much gone lead free across the board. These whiskers are fragile and perhaps blowing a high pressure air hose on the PCB would dislodge any whiskers that are growing from there. I have used lead free solder with some pretty fine pitch SMD chips with no problem (so far), but only for a few years now. Marty was warning about tin whiskers back in 2010 on prosound forum and I asked him then if Peavey had experienced any tin whisker caused failures. He did not respond to that question. So I still do not know wrt Peavey.&nbsp; OK I found the smoking gun..on the Peavey forum&quot;Prophetize&quot; means to make predictions about the future...&nbsp; &nbsp; For the record Marty was mainly a clinician and educator, not a design or manufacturing process engineer. He often repeated stuff he heard from engineers inside the company, or the service repair technicians, but not always in perfect context. Marty was generally correct 99.9% of the time but I had at least one run in with him back in the day when he misunderstood a &quot;fact&quot; he learned from one such engineer that he was applying incorrectly. I didn&#039;t interrupt him in the middle of his seminar class, but approached him after and it was just as well, because he proceeded to argue with me about it. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile&nbsp; &nbsp; :-)"&nbsp; data-smilie="1"data-shortname=":-)" /> That would have been awkward for all of us. You can do far worse than listening to Marty. 99.9% is a good percentage. And cleaning out your amps every 6 months generally will do no harm, but if it was necessary to prevent failures, it would be in the owners manual (or should be). JR</blockquote>

[QUOTE="John Roberts, post: 121609, member: 126"] Re: Peavey IPR2 amps? Tin whiskers have been known about since the '40s. They have re-emerged as an issue due to ROHS, lead-free solder requirements mainly for EU countries, but the electronics manufacturing industry has pretty much gone lead free across the board. These whiskers are fragile and perhaps blowing a high pressure air hose on the PCB would dislodge any whiskers that are growing from there. I have used lead free solder with some pretty fine pitch SMD chips with no problem (so far), but only for a few years now. Marty was warning about tin whiskers back in 2010 on prosound forum and I asked him then if Peavey had experienced any tin whisker caused failures. He did not respond to that question. So I still do not know wrt Peavey. OK I found the smoking gun..on the Peavey forum "Prophetize" means to make predictions about the future... For the record Marty was mainly a clinician and educator, not a design or manufacturing process engineer. He often repeated stuff he heard from engineers inside the company, or the service repair technicians, but not always in perfect context. Marty was generally correct 99.9% of the time but I had at least one run in with him back in the day when he misunderstood a "fact" he learned from one such engineer that he was applying incorrectly. I didn't interrupt him in the middle of his seminar class, but approached him after and it was just as well, because he proceeded to argue with me about it. :-) That would have been awkward for all of us. You can do far worse than listening to Marty. 99.9% is a good percentage. And cleaning out your amps every 6 months generally will do no harm, but if it was necessary to prevent failures, it would be in the owners manual (or should be). JR [/QUOTE]

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