turntable speed

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DRuce
Canada
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Joined: 25 May 2019 18:10

turntable speed

Post by DRuce » 25 May 2019 18:21

Hi .. what's the best tool and most accurate tool to use to test the RPM of my turntable. It's a TEAC TN-350 analog turntable :D I'm new to this

JoeE SP9
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Re: turntable speed

Post by JoeE SP9 » 25 May 2019 23:26

From the home page go to tools and download the strobe disk. An incandescent bulb is the only other required item. There are plenty of other sources for both a strobe disk and light.

cafe latte
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Re: turntable speed

Post by cafe latte » 25 May 2019 23:38

JoeE SP9 wrote:
25 May 2019 23:26
From the home page go to tools and download the strobe disk. An incandescent bulb is the only other required item. There are plenty of other sources for both a strobe disk and light.
A neon bulb works far better.
Chris

Coffee Phil
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Re: turntable speed

Post by Coffee Phil » 25 May 2019 23:51

Hi DRuce,

Welcome to the forum.

I agree with JoeE SP9, however I will say that incandescent lamps are not the best for this. If the strobe markings lack contrast, try a different wattage lamp. Some incandescents have more strobe effect than others.

Better is an old non electronic fluorescent lamp with a "magnetic" ballast. Also neon night lights are good. Some LED night lights also work, however LEDs for general illumination have high frequency ballasts and therefore will not work.

For 33 1/3 RPM you can put a piece of tape on the edge of the platter and count the revolutions for precisely 3 minutes. It should be precisely 100. The difference which you get from 100 is your percent error.

Woops! I missed Cafe Latte's post while typing this.

Phil
DRuce wrote:
25 May 2019 18:21
Hi .. what's the best tool and most accurate tool to use to test the RPM of my turntable. It's a TEAC TN-350 analog turntable :D I'm new to this

JoeE SP9
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Re: turntable speed

Post by JoeE SP9 » 26 May 2019 00:07

The OP could simply order the items below.
https://www.amazon.com/Nobsound-Strobos ... ics&sr=1-4

It's all moot anyway. The TN-350 doesn't offer any easily adjustable speed settings. You're pretty much stuck with what you've got.

Coffee Phil
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Re: turntable speed

Post by Coffee Phil » 26 May 2019 01:38

Hi Joe,

The Little Bear strobe sets is pretty cost effective compared to other ready made turntable strobes I've seen and it is almost cheap enough to not bother making your own.

It is not necessarily moot. Just because Teac is not saying how to tweak speed does not mean that some of us couldn't hack into it and do it.

Phil
JoeE SP9 wrote:
26 May 2019 00:07
The OP could simply order the items below.
https://www.amazon.com/Nobsound-Strobos ... ics&sr=1-4

It's all moot anyway. The TN-350 doesn't offer any easily adjustable speed settings. You're pretty much stuck with what you've got.
Last edited by Coffee Phil on 26 May 2019 01:59, edited 1 time in total.

Coffee Phil
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Re: turntable speed

Post by Coffee Phil » 26 May 2019 01:59

If you are inclined to make you own mains driven strobe here is a circuit:

https://www.vinylengine.com/turntable_f ... 778/medium

Here is a demo right next to the OEM neon strobe in my KD 500:

https://www.vinylengine.com/turntable_f ... 775/medium

Picture of the prototype:

https://www.vinylengine.com/turntable_f ... 776/medium

The above LED light was built to replace the anemic green "neon" indicators in my espresso machine. The reason for two ballast circuits is that there are two green indicators on the machine. The green "neon" assemblies were gutted and the LEDs were put in place of the discharge bulbs. The ballast assembly was built on ABS plastic formed to slip over the controller module in the espresso machine.

Before these lights went to their final home I figured I should see how they would do as a turntable strobe. They seem to be similar to the OEM neon in the sharpness of the strobe markings, but a made to purpose strobe could be optimised over this.

If you are going to build this be careful as you will be dealing with mains voltage.

Phil

JoeE SP9
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Re: turntable speed

Post by JoeE SP9 » 26 May 2019 02:23

Coffee Phil wrote:
26 May 2019 01:38
Hi Joe,

The Little Bear strobe sets is pretty cost effective compared to other ready made turntable strobes I've seen and it is almost cheap enough to not bother making your own.

It is not necessarily moot. Just because Teac is not saying how to tweak speed does not mean that some of us couldn't hack into it and do it.

Phil
JoeE SP9 wrote:
26 May 2019 00:07
The OP could simply order the items below.
https://www.amazon.com/Nobsound-Strobos ... ics&sr=1-4

It's all moot anyway. The TN-350 doesn't offer any easily adjustable speed settings. You're pretty much stuck with what you've got.
I agree with you Phil. Some of us could cobble up something to make/allow speed adjustments. I like the Neon bulb recommendation.

OTOH: For my Micro Sekai DQ-43 I had to remove the bottom panel and place the TT on supports that raised it high enough to access the electronics. I also needed a mirror to see what I was doing. It's not a task I look forward to doing again any time soon.

felixbo
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Re: turntable speed

Post by felixbo » 26 May 2019 07:30

Hi,
for normal use you can try this:
Smartphone app "RPM wow and flutter" (results may vary by some older phones, S7 (tested) and better works well) :
https://www.vinylengine.com/turntable_f ... &start=135
Or if you own a test record with an exact 3000Hz / 3150Hz track use "WFGUI" :
http://www.ant-audio.co.uk/index.php?ca ... ry=library

Cheers Felix

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