VPI Stroboscope Speed Control Disc

Strobe Lines for 33, 45 and 78, Accurate to Plus or Minus 2 Percent at 33 1/3

The VPI Stroboscope Speed Control Disc is a printed strobe disc that sits on the platter in place of a record. It carries large strobe lines for 33 1/3, 45 and 78 RPM, and it is accurate to plus or minus 2 percent at 33 1/3.

Platter speed drifts. Belts stretch, motors age, and a deck that ran true when it was new may be running a fraction fast years later — which shifts pitch on everything you play and is invisible until something measures it.

Accuracy, Range and Fit

What It Reads and What It Needs

The disc reads to plus or minus 2 percent at 33 1/3 RPM, with separate line patterns for 45 and 78. If the lines hold still under the light, the platter is at speed; if they creep forward or back, it is running fast or slow and by which direction.

Here is the fitment condition that matters: the disc works with turntables running a 60 Hz motor. Strobe patterns are cut to a mains frequency, so a 50 Hz supply reads against the wrong reference and the disc will report an error that is not there.

On a turntable with fine speed adjustment, the disc turns that control from guesswork into a two-minute job. On a deck with no adjustment, it still tells you whether a service is due.

Who Is the VPI Stroboscope Best For?

• Your turntable has fine speed adjustment — this is how you use it accurately rather than by ear
• You play 45s and 78s as well as LPs — line patterns for all three are on the one disc
• Your belt is a few years old — a stretched belt shows up as a speed error before it shows up any other way
• You want a check that takes two minutes — set it on the platter, start the motor, look
• Your mains supply is 50 Hz — the pattern is cut for a 60 Hz motor and will read incorrectly on 50; see the other options in test records

How Do You Use It?

Set the disc on the platter in place of a record and start the turntable. Look at the band for the speed you are checking under normal room lighting. Lines that appear stationary mean the speed is right; lines creeping forward mean fast, creeping back means slow. Adjust and look again if your deck allows it.

Pairs Well With

What most test-record owners shop next.

• Stylus force gauges — a test record shows the problem; a gauge is how you fix half of it
• Cartridge alignment tools — the other half, and the one a test disc will expose
• Record cleaning solutions — test signals are only as clean as the groove carrying them
• Stylus cleaning — do this before you trust anything a test record tells you

Frequently Asked Questions

How accurate is it?

Plus or minus 2 percent at 33 1/3 RPM. That is fine enough to catch the speed errors that matter — a stretched belt or a drifting motor — though not a laboratory measurement.

Will it work with my turntable?

It works with turntables running a 60 Hz motor. On a 50 Hz supply the strobe pattern reads against the wrong reference, so the result is misleading rather than merely imprecise.

Which speeds does it cover?

33 1/3, 45 and 78 RPM, each with its own band of lines on the same disc.

Do I need a special lamp?

Ordinary room lighting is what the disc is designed for. A dedicated strobe light gives a crisper pattern, but it is not required to read it.

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