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In Reply to: RE: Looks very nice, now . . . posted by M3 lover on October 12, 2016 at 17:11:30
I agree with replacing the electrolytes, but do not do it without having a good scope handy. The timing adjustments maybe waaay off once you removed and replaced the caps in the table itself. Replacing the caps in the PSU has no effect on timing. Follow the timing adjustment described in the service manual to a T. and make sure you get the timing as close to the center of the range provided as you can. Before you connect the PSU to the table after replacing the caps check the voltages for value and also for noise.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Follow Ups:
but any vintage direct-drive turntable that has been sitting around for decades is likely to need calibration anyway. So, that should be part of the routine when one wants to bring such a turntable back to its maximum capabilities, whether one replaces the electrolytics in the motor control circuit or not. And of course, one SHOULD replace those electrolytics prior to re-calibration since the effort and expense of calibration would eventually be wasted when those old capacitors do start to fail, which is inevitable. This brings us to the fact that there is a dearth of technicians who are truly capable of calibrating a DD. Bill Thalmann in Virginia and JP Jones in NYC are two guys who know what they are doing.Incidentally, JP has successfully recreated the single IC that is essential to the proper operation of an SP10 Mk2 or Mk3, on a PCB no larger than the original IC and with better than original performance. For a few hundred dollars, he will install his chip and calibrate the unit. Thus there is now no such thing as an irreparable Mk2 or Mk3, except for physically damaged ones.
Edits: 10/19/16
why not go through the entire recommended calibration procedure after replacing the caps?
No sense not optimizing performance at that point.
"The piano ain't got no wrong notes." Thelonious Monk
the timing may stay the same, if you replace the caps in the base you will have to readjust for sure. I am not saying that you should not adjust in any case. The warning is don't even try to replace the caps in the table unless you have a scope, you could get away with replacing the PSU caps and not mess things up...
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Why would anyone not replace the electrolytic caps in the motor unit at the same time? I assume they would be the ones most likely to damage unavailable ICs with their failure, while that may not be the case in the power controller unit.
"The piano ain't got no wrong notes." Thelonious Monk
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