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-   -   Gram motor speed indicator disk scans (https://www.vintage-radio.net/forum/showthread.php?t=176263)

Paul Stenning 7th Feb 2021 12:57 pm

Gram motor speed indicator disk scans
 
1 Attachment(s)
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.

hansomcommon 14th Oct 2021 9:24 am

Re: Gram motor speed indicator disk scans
 
Thank you Paul, I was looking for a disk speed scan!

majoconz 16th Oct 2021 11:05 pm

Re: Gram motor speed indicator disk scans
 
Works very well under one of those confounded CFL desk lamps - thanks Paul.

Sideband 17th Oct 2021 10:37 pm

Re: Gram motor speed indicator disk scans
 
They work very well under a neon lamp as well

Graham G3ZVT 23rd Oct 2021 12:34 pm

Re: Gram motor speed indicator disk scans
 
2 Attachment(s)
I recently found mine languishing in a drawer.

Attachment 244014 Attachment 244015

paulsherwin 23rd Oct 2021 2:24 pm

Re: Gram motor speed indicator disk scans
 
Quote:

Originally Posted by majoconz (Post 1414778)
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.

Avinunca 13th Feb 2023 9:30 pm

Re: Gram motor speed indicator disk scans
 
The VinylEngine website is a good place to find these and apps are available for smartphones to use with them.

GeraldSommariva 19th Aug 2023 6:38 pm

Re: Gram motor speed indicator disk scans
 
good information , help me with my speed problem


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