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 Post subject: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 9:19 am 
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Victor Jr
Joined: Mon Oct 30, 2017 4:56 am
Posts: 31
Does anyone has 78rpm speed strobe for EU (50hz) at SCALE (for example A4 scan)? I found many pictures at google and StrobeMaker software, but the drawings are not to scale, so it won't work accurate.

How to use a speed strobe? Should I print it out and glue it to a broken record? There are some factors which slowdown the motor, such as record weight, soundbox weight etc..

Should the speed strobe be used with soundbox on record?


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 9:46 am 
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Victor O
Joined: Fri Jul 28, 2017 6:55 am
Posts: 87
Location: Vienna/Austria
just buy a digital tachometer: https://www.amazon.de/gp/product/B00HFQ ... UTF8&psc=1
It is absolutely 100% worth it!


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 9:46 am 
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Victor II
Joined: Tue Jun 30, 2009 8:17 am
Posts: 299
Try this.
http://www.78rpm.com/rescat/strobe_info.htm


Ive used the program for cylinders too.


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 9:55 am 
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Victor IV
His epigrams are all his own, the man's an epigramophone!
Joined: Mon Oct 24, 2011 1:21 pm
Posts: 1808
Location: The Somerset Levels, UK.
My old friend and repairer the late Philip Knighton made this strobe on a 116mm hardboard disc, but it has been unusable since I replaced all my inefficient incandescent light bulbs with modern low energy ones.

For speed testing I prefer a low tech approach more in keeping with my ancient machines. I place a small piece of paper between the record and the turntable, then count the revolutions against my watch. It works for me.


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 12:49 pm 
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Victor Jr
Joined: Mon Oct 30, 2017 4:56 am
Posts: 31
Thank you all for tips. I purchased a digital tachometer with laser. I also have installed 2 different apps for RPM calculation, but I don't think apps will work accurate as a smartphone it is not the same weight as a record + soundbox on a turntable.


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Nov 24, 2017 1:05 pm 
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Victor V
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Joined: Thu Aug 19, 2010 9:36 am
Posts: 2196
Location: Delaware
Layla wrote:
Thank you all for tips. I purchased a digital tachometer with laser. I also have installed 2 different apps for RPM calculation, but I don't think apps will work accurate as a smartphone it is not the same weight as a record + soundbox on a turntable.

I agree, that’s why I use a digital tachometer while playing a record. Just put a small strip of the reflective material under the record so that it sticks out a bit. Then play the record and point the tachometer top down to point at that bit. Works like a charm

Andreas


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Mon Nov 27, 2017 12:30 pm 
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Victor II
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Joined: Sun Mar 10, 2013 4:34 pm
Posts: 364
Location: Pittsburgh
There is a program called Strobe Maker that you can printout any speed strobe disk for 50 or 60 Hz. You have to use a neon light with it or an old style flourescent desk lamp to freeze the dots.
I made some for the different Victor speeds and 80 rpm.
I'm sorry I don't know the link to it.


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Mon Nov 27, 2017 1:03 pm 
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Victor III
Joined: Wed May 20, 2009 8:20 pm
Posts: 998
A strobe disc will work with a fluorescent lamp if the fixture has a magnetic ballast, however not if it has an electronic ballast. You can easily make make a neon lamp for your strobe disc using a small neon bulb with a 100,000 ohm resistor in series for 120 volt operation or a 200,000 ohm for 240 volt. It could probably be done with an LED and a series resistor also but I have not done that. The advantage of using a strobe is that speed irregularities and "creep" areeasy to see. That said, I do love my digital tach.

Jim


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 Post subject: Re: Help need 78rpm speed strobe for EU (50hz) at scale
PostPosted: Fri Dec 01, 2017 11:04 am 
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Victor Jr
Joined: Tue Oct 31, 2017 2:28 pm
Posts: 11
There are plenty of free apps for Iphone (I am sure for other phones as well) that you can use to strobe at the frequencies you want.


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