![]() This works out to 4.2% and 4.6% respecivly. With the tension pulley which Rek-O-Kut used removed (the way I received the machine) I got 7500 RPM and with my version of the pulley installed I got 7530 RPM. With the sanity check done I varied the rate to hold the markings still. The markings were moving at what looked like the same rate as with the lamp. I set the tach to 7200 RPM to get 120 flashes / sec to emulate the lamp on 60 Hz. After determining that the speed was way fast with a flourescent lamp (old type with 60Hz ballast) I turnd off the lamp and got my Extech stroboscope tach (GR Strobo-Tac knock-off): I just have a standard strobe disc with a single band of markings for each popular speed. Looking for more moral justification, I reasoned that the thread is about turntable speed and my issue is about turntable speed even if it is different question. I did have sort of a moral twinge about hijacking the thread, but a statement which you made suggested to me that you may have knowledge about speed accuracy in old turntables which may be useful to my issue. 1 1/2 percent fast would be 33.83 RPM or about 33 7/8 RPM.Īnd good luck from the speedy old bald guy who is a barber's grandson, (too fast, and not enough hairs) The error is actually about 1%, actually 9 tenths of one percent, so most 33 1/3 RPM tables run about 33 1/2 RPM, or even a little faster. Fred, your computation is correct in amount, but not correct in direction. This means that 33 1/2 RPM is actually 1/6 RPM FAST, not 1/6 RPM slow. Doing the fractions, 33 1/2 RPM equals 33 3/6 RPM. And, almost everybody has a turntable that runs a hair, or maybe a couple of hairs, fast, so they are used to it.Īlso, I am going to have to knock heads with Fred (fscl) on the subject of speed. You are more likely to tolerate what is fast than what is slow. The problem is that fast speeds make everything seem brighter and more cheerful, and so when you slow it down to correct speed, it sounds REALLY draggy and dead. ![]() You will definitely notice it in pitch, and it may be noticeable in tempo, depending on the music. It would definitely flunk the strobe test. PM me with an Email where I can send it, because VE won't take pictures from my computer.Ĥ.5% seems to me to be way too fast. ![]() I have converted the strobe to a PDF, and you are welcome to it, as is DinamoDennis. When I was working part time at Pro Electronics, back in 1979-1983, I took the position that anything that was less than 2% fast was "OK," based on that strobe disc. Not meaning to hijack the thread, but since we were talking about turntable Phil: First, how did you come to that 4.5% fast measurement? Did you use a calibrated strobe disc? I have an 8 inch calibrated diagnostic strobe that measures all 4 speeds and has bands for plus 2% and plus 4% and minus 2% and minus 4% for each speed, made by Audiotex. Don't expect that you will have exact tempo or tune, even if your turntable is running correctly.Īnd good luck from that out of tune old guy, Most of the turntables that I have owned and measured over 50 years in the hobby, including Thorens and Garrard and Dual players that do not have exact vernier speed adjustment all run a little fast.Īlso, you will find often that you will not be able to tune a record to the exact pitch of an instrument a that you are playing because of speed irregularities that are a part of the recording process. This is so that as they slow down over time, they will not become too slow. You will find that most turntables that do not have vernier speed adjustment run about 1-1 1/2 percent fast. If speed measures correctly and music still sounds slow, then you may have a defenct in pressing, or you could be deceived by fact that a lot of turntables run a little fast. If more or less, turntabel is fast or slow. The second way is to put a piece of tape on the turntable and count te number of times it spins to the exact same spot in 3 minutes. If they move counterclockwise, turntable is slow. If they move clockwise, turntable is fast. If dots stand stlii, turntable is on speed. click on "Strobe discs." Then just print one for 33 1/3 RPM use a neon or incandescent bulb and hold bulb near dusc as it spins. Click on "Tools" and when you get the "Tools" page. The discs can be found and printed on this website, up at top of this page. You can get a strobe disc and measure the turntable speed with the strobe disc. There are a couple of ways to find out if turntable is running slow. The first possible answer is that there is something wrong with your turntable that is causing it to run slow. ![]() The second question is why do some records sound slow to you? The answer to that is somewhat more complicated, with several possible answers. Yoy really have 2 questions: The first is what is what does the mark on your recoird player that says "33" mean? The answer to that is that the marking refers to an actual exact speed of 33 1/3 RPM.
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