I was wondering why no other techs here on yt talks about it. There are a few issues to consider: 1. Your phone probably weights more than a vinyl LP, it slows down the speed of the platter 2. Your phone isn't calibrated like all other phones 3. Measuring without tracking load of the record changes the speed of your TT 4. The Pioneer Pl-630(I have the same model here) is a descent TT and it's constantly measuring the speed of the platter and compensates the torque load with sensors even with your phone on top. Lower end TT does any kind of compensations. 5. Better use a frequency counter instead of the Fluke, because the most scopes struggles with dirt in grooves. Frequency counters do a better job on filtering out frequency spikes. 6. Laphroaig select is a good choice. SLÀINTE MHATH
In the late 1990s, a man in his late 40s, told me that he read in audio hobby magazines, that musicians with perfect pitch would lessen their turntable's pitch slightly below what the strobe indicated.
Thanks for the informative video!!! BTW I have seen your previous video on restoring the LAB-400, and was inspired to restore several of the LAB-400s that I have. Since viewing this latest video on calibration, I cannot wait to test the LAB-400's that I have restored!!! Recently picked up a "NOS" LAB-400 that has not been restored, and will compare my results. Gonna have to pick up some good single malt scotch before I attempt....LOL, thanks again for the great info, Dave
I just ran across your channel. I was just wondering if my Pro-ject turntable was in spec recently, and of course "there's an app for that"! Nice job. I don't know if the speed is consumer adjustable, so I almost am afraid to check it out...
Yip - I learned "stay with the Scotch", so thanks! I've been concerned about this recently so I can relate. My Technics SL-1100's speed is servo-controlled not quartz-locked. I've found the local line voltage varies throughout the day (which will affect the speed) and my strobe reading will change as the circuit warms up. I'll set it for the first side of a record and find I have to change it for the next side. After that, it stays stable. I've gotten over the very small error in speed so yay for me. However, I've been using RPM and became more concerned about wow and flutter! The little graph of w&f it produces is nasty - my turntable is supposed to have better than 0.03% w&f but my table achieves only 0.05% at best. All I can say is, where is the scotch?
I would not assume that the Shure test record is necessarily exactly 1 KHz. They might be using an audio signal generator, and those things are usually Wein bridge oscillators, not quartz locked, especially not from the 1970s. I would trust the power line frequency more than just about anything else, although the power line frequency has been deregulated in recent years. Still, the entire power grid has to stay in sync, so I'd assume it's as close to a standard as anything you're likely to find, except maybe for a quartz locked turntable. On the other hand, quartz crystals can have frequency errors too. Quartz crystals do better at consistency than precision, although they're usually close enough. A typical crystal is accurate to about +/- 20 to 50 ppm.
possibly the tone was off because of the cartridge ? so slight/ miniscule though, so who cares.. close enough because on real music you wont notice it with mix of instruments and vocals ect. ... at least I think that I would not notice it.
