zebra50

Crazy ribbon mic with FOUR ribbons
« on: March 11, 2011, 02:31:52 PM »
Check out this bad boy, on the bench today.
It's very old and should really be in a museum rather than a studio (or my bench!).



It is a Shaftesbury Velodyne Supreme! Sounds more like a bicycle to me. The plate is stamped "prov pat": I wonder if it was a prototype?



FOUR ribbons wired in series!!!



In fact it seems to be one giant ribbon that goes round corners, and each length of ribbon has a 'node' in the middle, so I guess we could call it 8 elements, each at 45 mm x 4 mm. So 360 mm of vibrating ribbon!

And there is no transformer. I guess the designer thought it had enough Z already!



Where are the ribbon boys? Marik, Roddy?

 :o
Ribbon microphone services
http://www.xaudia.com
Microphone blog


Re: Crazy ribbon mic with FOUR ribbons
« Reply #1 on: March 11, 2011, 02:44:54 PM »
a provisional patent was issued, so there was obviously some paperwork that changed hands.  would be interesting to read design notes/justifications if those papers are still managing to collect dust somewhere...
There's nothing like the right tool for the job.
And -usually- that's what I end up using...
..nothing like the right tool for the job!

tchgtr

Re: Crazy ribbon mic with FOUR ribbons
« Reply #2 on: March 11, 2011, 03:19:25 PM »
Incredible! Thanks for sharing this.
Resistance is not futile. It is voltage divided by current.  (thanks, Bill)

zebra50

Re: Crazy ribbon mic with FOUR ribbons
« Reply #3 on: March 11, 2011, 03:34:31 PM »
Yes, that's it! Provisional Patent! Normally you see "Patent Pending" in these cases.

I'll have a dig over the weekend and see if I can pull up anything from the patent archives.
Ribbon microphone services
http://www.xaudia.com
Microphone blog

EmRR

Re: Crazy ribbon mic with FOUR ribbons
« Reply #4 on: March 11, 2011, 03:36:05 PM »
Is this like the American Bruno Labs hi-Z ribbon/condenser mic which is a series of ribbons against a backplate, with a polarizing voltage?  It doesn't look the same (trying to see this from an iPod), but still closer than anything I've seen.  

http://www.coutant.org/webster/index.html
« Last Edit: March 11, 2011, 04:07:42 PM by emrr »
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

zebra50

Re: Crazy ribbon mic with FOUR ribbons
« Reply #5 on: March 11, 2011, 06:20:36 PM »
That Webster is very interesting too.

But this one looks much more like a conventional ribbon. There is no backplate, and the ribbons hang freely between the magnet poles like usual.

Here's the side and back - a bit blurry but you get the picture.




Ribbon microphone services
http://www.xaudia.com
Microphone blog

Rossi

Re: Crazy ribbon mic with FOUR ribbons
« Reply #6 on: March 12, 2011, 05:15:39 AM »
Wow, this thing is nuts!  ;D  And the Webster one is even nuttier!!  :o

I wonder what those sound like...
"I am not a number, I'm a free man!"
"Hahahahaaaaaa!!!!!"

gary o

Re: Crazy ribbon mic with FOUR ribbons
« Reply #7 on: March 12, 2011, 08:03:28 AM »
WOW !!!! what a thing !!! Yes I wonder how it would sound..........could be interesting design for the ribbon DIYers to play with....what a lovely piece of history looking forward to finding out more thanks for posting...

zebra50

Re: Crazy ribbon mic with FOUR ribbons
« Reply #8 on: March 13, 2011, 03:53:24 PM »
a provisional patent was issued, so there was obviously some paperwork that changed hands.  would be interesting to read design notes/justifications if those papers are still managing to collect dust somewhere...

Here we go....



Full patent application is here:
http://www.xaudia.com/omnip/Mics/shaftesbury/GB460775A.pdf

It looks like the idea was to have one giant ribbon with relatively high impedance. Normally that wouldn't give you as high an output as it should, because of 'rippling', or other incoherent vibrational modes. But by fixing the ribbon in multiple places they claim to avoid this problem. I wonder how well it worked?

I'm still struggling whether to try and get this working or not. I suspect it really ought to be left in its historic condition, but I am curious about how it would have sounded.

Edited for pointlessness
« Last Edit: March 13, 2011, 04:52:24 PM by zebra50 »
Ribbon microphone services
http://www.xaudia.com
Microphone blog

Re: Crazy ribbon mic with FOUR ribbons
« Reply #9 on: March 13, 2011, 04:46:21 PM »
Why not make your own version of it?  It could stay in it's historic state and also you could have one  ;)

here is the link... corrected... your link was missing a point (.)

http://www.xaudia.com/omnip/Mics/shaftesbury/GB460775A.pdf


zebra50

Re: Crazy ribbon mic with FOUR ribbons
« Reply #10 on: March 13, 2011, 04:51:11 PM »
Quote
here is the link... corrected... your link was missing a point (.)

Doh! Thanks for that! Not the first time I have done something pointless  :P

Quote
Why not make your own version of it?

I could certainly knock something up to prove the principle.

I have a hunch it might actually be crap!
Ribbon microphone services
http://www.xaudia.com
Microphone blog

EmRR

Re: Crazy ribbon mic with FOUR ribbons
« Reply #11 on: March 13, 2011, 05:43:51 PM »
I have a hunch it might actually be crap!

Seems likely.  The errors this design introduces seem numerous. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Rossi

Re: Crazy ribbon mic with FOUR ribbons
« Reply #12 on: March 14, 2011, 09:35:44 AM »
I wouldn't expect too much, either, but I'm curious anyway.  :D
"I am not a number, I'm a free man!"
"Hahahahaaaaaa!!!!!"


 

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