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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 7th Feb 2021, 11:57 am   #1
Paul Stenning
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Default Gram motor speed indicator disk scans

This cardboard is disk approx 12cm diameter, published by Bernards and cost 10p back in the 70s.

It relies on the slight flicker of filament lamps to give the strobe effect, 50Hz one side and 60Hz the other side.

Scans attached, 600DPI.
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File Type: zip Gram-Motor-Speed-Indicator.zip (2.62 MB, 287 views)
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Old 14th Oct 2021, 8:24 am   #2
hansomcommon
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Default Re: Gram motor speed indicator disk scans

Thank you Paul, I was looking for a disk speed scan!
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Old 16th Oct 2021, 10:05 pm   #3
majoconz
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Default Re: Gram motor speed indicator disk scans

Works very well under one of those confounded CFL desk lamps - thanks Paul.
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Old 17th Oct 2021, 9:37 pm   #4
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Default Re: Gram motor speed indicator disk scans

They work very well under a neon lamp as well
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Old 23rd Oct 2021, 11:34 am   #5
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Default Re: Gram motor speed indicator disk scans

I recently found mine languishing in a drawer.

Click image for larger version

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Old 23rd Oct 2021, 1:24 pm   #6
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Default Re: Gram motor speed indicator disk scans

Quote:
Originally Posted by majoconz View Post
Works very well under one of those confounded CFL desk lamps - thanks Paul.
Be careful with CFLs or LEDs though - they may not strobe at 50Hz, depending on the power supply arrangements. A traditional fluorescent should be OK though.
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