Turntable speed accuracy

The turntable speed should be at least as accurate as the tape recorders used to record, master, and playback the tape.

Constant speed is "much more" important than absolute speed.

Just buy a strobe disc and illuminate it with a light bulb.

The 60 Hz AC frequency does not fluctuate enough to worry over.

Adjust the speed of your turntable, or AC input (if you have a variable frequency supply like VPI SDS) for the lines or dots to appear stationary or slightly vary around a fixed position.

This is simple and more than sufficient. Tape decks are not all that accurate, and do go out of spec.

On my VPI TNT the SDS AC line frequency is set within .01 Hz.

If your platter is heavy, playing a record will not affect the speed.

Halcro

Sutherland designs "CRAP" cold sounding phono stages!

They sound similar to HALCO amps!

The turntable in the video has a wimpy low torque motor drive system!!

Needle drag does not slow down well designed turntables!

Halcro

Sutherland designs "CRAP" cold sounding phono stages!

They sound similar to HALCO amps!

The turntable in the video has a wimpy low torque motor drive system!!

Needle drag does not slow down "Properly Designed" turntables!

Hiho

The drive system on the TW Raven just is not perfect, that's all.

Does the TW raven have any "measurable" wow and flutter, or rumble?

The VPI TNT III and IV with SDS and their motor, flyweel, and belt system have "UNMEASURABLE" wow and flutter and rumble. The accuracy and consistency, is better than "ANY" tape deck or disk cutter. That is "ALL" that is necessary or maters! VPI has not improved since, or has anyone else as far as speed, end of story! Do not worry or leave sleep over this.

The strobe lines on a strobe disk are not "exactly" spaced, and the flashing bulb has ever so slight time delays, which leads to a very slight jitter of the image.

As far as the KAB strobe goes, I agree it is a better way of measuring speed inconsistencies, that "only mater" to neurotic audiophiles! Sane, intelligent, knowledgeable people just do not need it!

You and Moncrief are splitting hairs here, and hung up on "unaudible absolutes"!

How many years was it before side one of Kind of blue was found to be 1/3 of a semitone fast? Maybe Miles knew, but who else? Speed variation "is" noticeable on classical piano "IF" you have played a piano, but typically the audience could care less.

I have read the IAR and Moncrief is a very good "theoretical" technical BSer. You should read his BS about "audible goodness curves", or the Oracle having 377 times lower distortion than a Linn, or his "Wonder" caps. He can weave a technical tale as good as anyone, but he is no Richard Heyser!

AC line frequency in the US is adjusted within .02% and accurate within .033%, the KAB strobe is accurate within .03%.

AC from the power line is as accurate. The KAB website info is WRONG! A light bulb and strobe disk is as accurate. END OF STORY!!!

From Wikipedia

Regulation of power system frequency for timekeeping accuracy was not commonplace until after 1926 and the invention of the electric clock driven by a synchronous motor. Network operators will regulate the daily average frequency so that clocks stay within a few seconds of correct time. In practice the nominal frequency is raised or lowered by a specific percentage to maintain synchronization. Over the course of a day, the average frequency is maintained at the nominal value within a few hundred parts per million.[19] In the synchronous grid of Continental Europe, the deviation between network phase time and UTC (based on International Atomic Time) is calculated at 08:00 each day in a control center in Switzerland, and the target frequency is then adjusted by up to ±0.01 Hz (±0.02%) from 50 Hz as needed, to ensure a long-term frequency average of exactly 24×3600×50 cycles per day is maintained.[20] In North America, whenever the error exceeds 10 seconds for the east, 3 seconds for Texas, or 2 seconds for the west, a correction of ±0.02 Hz (0.033%) is applied. Time error corrections start and end either on the hour or on the half hour.[21][22]

My last post should end this thread.

The VPI SDS adjustment, a strobe and light bulb, or a $100 KAB strobe, "are all" about as accurate as your AC line frequency!

How do all you "SUCKERS" feel, that payed $100 for the KAB BS!