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Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 14 Jan 2011 20:48
by JaS
Download

Many thanks to Klaus R

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 15 Jan 2011 08:15
by Blue Angel
JaS wrote:Download

Many thanks to Klaus R
Ditto.

ba

Who Invented Moving Coil and Moving Magnet - Klaus R

Posted: 16 Jan 2011 23:28
by Terry Robinson
A truly excellent article, but don't forget Paul Voigt.

Cheers,

Terry.

Posted: 18 Jan 2011 08:03
by Klaus R.
Paul Voigt, did he design phono cartridges or only transducers for loudspeakers?

Klaus

Posted: 18 Jan 2011 15:50
by Bebé Tonto
Klaus, great article. Now you owe us the Part II, covering "modern" (1958-) designs...

Who invented Moving Coil and Moving Magnet? - Klaus R

Posted: 19 Jan 2011 03:55
by Terry Robinson
Hello, Mr Klaus:

According to the chapter "The life and achievements of P. G. A. H. Voigt", part of the book "Sound Bites: 50 Years of Hi-Fi news", Mr. Voigt invented both a Moving-Coil disc cutter and a Moving-Coil pickup (cartridge). This pickup was not patented and was much copied: Leak was one.

Cheers,

Terry.

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 23 Nov 2011 02:01
by RED_One
We should not forget the contribution made by A R Sugden (Connoisseur) to stereo playback.

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 22 Dec 2014 19:47
by spittenkittens
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Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 22 Dec 2014 19:51
by spittenkittens
I messed up, these is a mm cartridge from an early 78 player. The motor is "spin to start" It was supposed to hook up to a radio amp. The magnet is the huge "U" shaped magnet. The arm vtf is probably a pound and took steel needles. It is not working right and I suspect the magnet has lost it's power. There was corrosion on the copper wire leads but I was able to clean that up.
Anyway you can tell it takes years of experience to to where we are today.

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 22 Dec 2014 20:10
by circularvibes
Thanks for the neat pics Spittenkittens. It was a common repair to antique electric phonos to have their cartridges remagnetised. A warning too, they could be demagnetised by dropping them sharply on the record/motorboard. I have never heard one and would like to know if they are pleasant to hear. I wonder if modern MC carts can be demagnetied too. I suspect not as they probably use better magnets nowadays.

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 22 Dec 2014 21:08
by spittenkittens
It is from a rca r-93-a. I did not have any contact cleaner when I was messing with it awhile back. I was getting moving on a vom (ohms) so maybe it does work now. I had tried to re-magnetize the horseshoe magnet with another powerful magnet.
I need to find something to amplify the signal, but I am not in the mood to mess with it right now. Would be fun if it works. The motor is only 7 watts. The early days of electricity were interesting. I think they understood more than technology would allow them to do at that age, at least to mass produce.

Re: Who Invented Moving Coil and Moving Magnet? - Klaus R

Posted: 23 Dec 2014 06:39
by circularvibes
Beware, the motor MIGHT be old enough to be a 25 cycle one. If it is, you will burn it out if you try running it on today's 60 cycle current. As to amplifying it, you will need a matching radio, I don't believe there would be the right curve or input voltage on any of today's amps. This just means you get to go shopping for another antique for your collection(and maybe restore it too). I know here in Canada that 25 cycles was used in some areas until the 1940's. Our hydro companies had to repair or replace anything that didn't conform to the 60 cycle standard by legislation, or they wouldn't have been allowed to change the grid. I know of this because family friends had a clock that was a wedding present that hasn't been able to be plugged in because a new motor wasn't available and they didn't want to give it up as it was also a silver floor lamp.