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Ron wrote:
recovery! spec comes back and the crackles and pops subside to an almost acceptable level, but here's the rub they never really subside completely, you are left with this background crackle and if you leave the set off for a few days it gets worse again, its nothing specific as I've tried to trace it it seems to come from all over IF AF front end etc, I'm not talking backgound hiss, its a crackle, sometimes quite bad other times almost completely gone? is this a general breakdown of componant material? ie carbon in the resisters or similar? has anyone else out there found this problem if so whats the answer? The most common reason for popcorn noise is bad resistors, but sometimes you'll find some weird offenders (like bakelite tube sockets that have arced over and formed conductive carbon paths inside). The best thing to do is get a wooden rod and start tapping on resistors. Often the more noisy of them will also be microphonic and you'll find it when you tap on it. Use a dowel or something else nonconductive that will let you put some good force on larger resistors. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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