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In Reply to: RE: RPM's and Strobe posted by Lakeshore Larry on February 07, 2016 at 11:56:08
I am using the KAB disc and strobe... I set my SDS unit a long time ago using the platter app and test record at 3150 hz, the sds has never been changed and the strobe and disc say it's dead on..
Follow Ups:
Strobes are pretty poor indicators of speed, although one would think it should show a 10% error. The test disc and platter speed are a better indicator.
What does your test disc and platter speed app show with the current set up (30 revs/minute)?
That's the problem I don't have my test record right now, I lent it to a friend.
Do you have a simple strobe disk?
You would need either a incandescent or a neon light source, the newer fluorescent bulbs don't work very well.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yes I am using the KAB strobe and disc now, also have the VPI disc.
Are you using the battery powered strobe light with the KAB strobe?
Does the VPI strobe agree with the KAB strobe when using a florescent light to illuminate the VPI strobe?
How did you mark your turntable platter for counting revolutions?
I put a white dot on my platter when I used to count revolutions on my Sota Millennia Vacuum. However, I never encountered the problem you're having. My platter revolution counting always agreed with my strobe disc measurements. In fact, I would set the platter speed using the strobe disc before counting revolutions in order to get it very accurate to begin with. Then, I would time revolutions with the clock in my handheld calculator that also contained a special program I wrote to calculate percent deviation from perfect platter speed. Now, I use a Phoenix Engineering RoadRunner to maintain platter speed and I highly recommend the Phoenix Engineering products.
I would recommend replacing your SDS with the Phoenix Engineering Eagle power supply and RoadRunner tachometer . These components will automatically adjust your turntable for the correct platter speed each time you turn it on in addition to providing electronic switching between 33 and 45 rpm. Feedback from the RoadRunner to the Eagle will maintain exact platter speed during motor warm-up and you will always have a readout of your platter speed to an accuracy of 0.003%. Check out the YouTube video at the link below.
Best regards,
John Elison
John,
I am not using the SDS unit on this TT, I have two tables the one in question is DC powered. Thanks anyway, I think I just figured out what's going on!!!
Okay! I thought you mentioned an SDS, but I guess not. Sorry!
So, are you going to tell us what you figured out?
Thanks,
John Elison
I did mention an SDS that is on my other TT, anyway I feel like an idiot. When I was counting the rpms I was using the splice on the belt as a reference point (dumb ass) instead of putting a piece on the platter itself. So the speed is correct and agreeing with the strobe and disc now I feel better...
they are not the same. You can calculate how many times the belt goes around per minute :)
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
We've all done it. Such is life! ;-)
Anyway, it's always good to find out you don't have a problem.
Best regards,
John Elison
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