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Might have made an oops http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=643 |
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Author: | SoundMods [ September 2nd, 2016, 3:47 pm ] |
Post subject: | Re: Might have made an oops |
Hi Tom! As it turns out -- most I.C.s are rated to 85-degrees C. THAT'S HOT!! It says a lot about the "wiggle room" manufacturers use to cover their asses because in your case the I.C. still worked. My claim to fame many decades ago was when I had a PS Audio pre-amp that I was "hot-rodding." I had the board out to enable working on it. It was DC-coupled so after some changes I stood the powered up board up so I could get to a point in the circuit to measure output off-set. As I raised the board I heard what turned out to be a piece of cut-wire play Pachinko among the components on the other side of the board. It landed across a transistor with a white flash. What added insult to injury was that the white flash generated a white/gray mushroom cloud like a sub-miniature nuclear explosion. YIKES!!!! I was horrified!! But hey -- if you're not making mistakes you're not working -- RIGHT? |
Author: | tomp [ September 3rd, 2016, 5:49 pm ] |
Post subject: | Re: Might have made an oops |
You've got that right. I guess you can say that your experience can be measured in part by the number of dead devices you have fathered. Tom |
Author: | Cogito [ September 4th, 2016, 9:24 am ] |
Post subject: | Re: Might have made an oops |
I am interested in learning. Count me in. |
Author: | SoundMods [ September 4th, 2016, 11:43 am ] |
Post subject: | Re: Might have made an oops |
My worst audiophile experience was with a Futterman moving-coil head-amp. I hot-rodded it (of course -- that's what I do) -- when it worked it was sublime. Futterman based his design on Nuvistors -- a good choice -- YES? Hell no! After four sets of tubes going noisy I got so pissed off I went outside and dumped it in the garbage can and had no regrets. The ceramic seals on Nuvistor tubes have only to get a microscopic crack and when just a couple of molecules of air gets in even the getter is no match for a leak. Makes one wonder what Conrad Johnson's experience with Nuvistors was. Noise is certainly the enemy of LP playback. A Sony CD player was great until I either overheated the DAC chip or let a static charge slip to it (I couldn't feel anything -- but it was suspect). Sony used the Phillips Dynamic Element Matching DAC that had a brace of .1-ufd caps. A major POOGE mod to anything Phillips then was to replace the DAC caps (usually monolythic ceramics) with some nice polypropylene of polycarbonate caps. By that time in audio history outboard DACs became of age and the unit became a nice reliable transport. Waste not -- want not. Over time experience teaches one to be careful and deliberate when working on this stuff. Like with carpentry -- measure twice -- cut once. Electronics -- evaluate three times -- then solder. My best tool is a 5-power jewelers' head-set stereo magnifier. That way I get up close and personal to the job at hand. |
Author: | randy warren [ September 4th, 2016, 12:06 pm ] |
Post subject: | Re: Might have made an oops |
Tom, if time allows me, I would like to come over and get educated, thanks! |
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