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SANSUI FR 4060 running half step fast
Sir Thrift-a-Lot:
--- Quote from: rgpit on November 05, 2018, 09:22:58 PM ---
I think putting tape on the platter is a bad idea. It will add a lot of wow and flutter to the output signal.
--- End quote ---
I agree. I'm not sure that the 50Hz/60Hz is the culprit, because that would be about an 18% difference, and I'm sure a half step is far less than 18%. That said, I like the notion that brown power could be the culprit. Lots of fancy tables use outboard speed controls. Do you power condition? Do you have a gauge to say exactly how many volts you are running at? Perhaps you could measure the speed at peak usage and late at night when usage is down and see if there is a difference. There is a great app for Android called RPM Speed and Wow which you can use to measure. If you are one of those iGuys I am sure they also have a similar app.
MacGeek:
If the motor speed is controlled by the 60hz frequency, it doesn't seem a voltage drop should affect it (unless maybe it's extreme). Might be a motor cap or two going out of spec. Bad caps almost always seem to be the culprit when my tape machines run fast.
OldiesButGoodies:
--- Quote from: MacGeek on November 06, 2018, 07:53:17 AM ---If the motor speed is controlled by the 60hz frequency, it doesn't seem a voltage drop should affect it (unless maybe it's extreme). Might be a motor cap or two going out of spec. Bad caps almost always seem to be the culprit when my tape machines run fast.
--- End quote ---
That would also be my 1st component-of-interest. Be it cassette decks or turntables, bad caps in the motor electronics make them behave in wacky ways - I have seen turntables rotate in the opposite direction. Are the 0.22 and 0.033 uf caps measuring ok?
scorpio333:
Emp, do you know which capstan you have? Those tables shipped with two different capstans, one for 50 and one for 60hz.
Not arguing against the idea the caps are to blame, but what if they're not? Found a few posts about those early 70's Sansui's, none mention caps. Most mention the tape idea, hanging the belt with a weight to stretch it a tad, and one that puts nail polish on the capstan to thicken it up a bit. Either way, Im interested in hearing what solves it.
EmperorNorton:
Might just drive out bethel park way, but in the meantime , perhaps order a
Little bigger belt, this one seem pretty tight. I'm new to this stuff but it seemed tight.
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