The Talking Machine Forum — For All Antique Phonographs & Recordings

It is currently Fri Sep 21, 2018 10:13 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 28 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Wed Feb 21, 2018 11:53 am 
Offline
Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 1933
Location: Harrison Township, MI
Here is where I buy the gasket material. I've circled the one I use. Notice the product below it has a harder durometer. Interesting. McMaster Carr's website is www.McMaster.com


Attachments:
silicone rubber.JPG
silicone rubber.JPG [ 158.69 KiB | Viewed 309 times ]
Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Wed Feb 21, 2018 12:04 pm 
Offline
Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 1933
Location: Harrison Township, MI
Just to bring the topic of "durometer" into perspective, I've included the following chart that compares hardness to known objects. The durometer values in the catalog cut above are related to the "Shore A" scale I believe.


Attachments:
durometer.JPG
durometer.JPG [ 84.71 KiB | Viewed 309 times ]
Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Wed Feb 21, 2018 6:58 pm 
Offline
Victor III
Joined: Wed Aug 01, 2012 8:43 pm
Posts: 756
Location: Port Huron, MI
This was great! I have always admired your talents and your writing ability, too. Do you plan to have your ears calibrated so you can continue tone tests with greater accuracy?
Dave D


Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Thu Feb 22, 2018 4:09 am 
Offline
Victor III
User avatar
F. Depero, "Grammofono", 1923.
Joined: Thu Feb 24, 2011 4:19 am
Posts: 711
Location: Italy
JerryVan wrote:
Marco Gilardetti wrote:
Oh, I see, underscore, not hyphen. Formally he ships "worldwide", but then his list of excluded countries is so long that basically the whole Europe is excluded. I cannot even take a look at these famous diaphragms. Not of any interest to me, at this point.


The diaphragms are from this seller: https://www.ebay.com/itm/Victor-Orthoph ... SwJJVZqzRO Seller name: bobb7476


Thanks Jerry, but these look like generic spider-less replacements, easily available also in Europe. Thanks for the link anyway.


Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Thu Feb 22, 2018 12:04 pm 
Offline
Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 1933
Location: Harrison Township, MI
Dave D wrote:
This was great! I have always admired your talents and your writing ability, too. Do you plan to have your ears calibrated so you can continue tone tests with greater accuracy?
Dave D



Dave,

Thanks for your kind comments and enthusiasm! I'm looking into the calibration process... (honestly, I didn't know about this when I made my original "calibration" comment) :lol:


Attachments:
Capture.JPG
Capture.JPG [ 178.22 KiB | Viewed 268 times ]
Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Fri Feb 23, 2018 12:05 am 
Offline
Victor V
User avatar
Joined: Tue Dec 14, 2010 1:17 am
Posts: 2893
Location: Where there's "hamburger ALL OVER the highway"...
JerryVan wrote:
Dave D wrote:
This was great! I have always admired your talents and your writing ability, too. Do you plan to have your ears calibrated so you can continue tone tests with greater accuracy?
Dave D



Dave,

Thanks for your kind comments and enthusiasm! I'm looking into the calibration process... (honestly, I didn't know about this when I made my original "calibration" comment) :lol:


Eh? What?

Bill


Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Fri Feb 23, 2018 1:20 am 
Offline
Victor IV
Joined: Wed May 20, 2009 8:20 pm
Posts: 1058
From my experiences I can state that there are indeed differences in early vs. later production Orthophonic diaphragms. Brass and early potmetal reproducers do have thinner diaphragms than later potmetal ones; early potmetal being defined as those which have the needle setscrew coming straight out to the front face of the reproducer, as opposed to the later style in which the screw is set at an angle. Some years ago I rebuilt several of both types and took care to note differences such as diaphragm thickness but unfortunately I can no longer remember the numbers. I have noted other differences such as brass-bodied ones with potmetal rings as well as with brass rings.

Early potmetal reproducers use steel bushings for the outer bearing races with magnetized bearings. Later potmetal reproducers use brass outer races and have a steel washer against the steel balls and a rubber washer beetween the outside of the steel washer and the dust cap. A brass reproducer has the outer races machined into the steel bearing block rather than having inserts. They also use magnetized bearings.

As far as sound, there are differences between brass/first generation potmetal and second generation potmetal reproducers. They can be subtle, but they are discernable when doing A-B testing. For several years my 8-30 has been equipped with a later generation potmetal reproducer which, to me, is the best overall performer in my collection.


Top
 Profile  
 
 Post subject: Re: New Orthophonic Diaphragms & Gaskets???
PostPosted: Fri Feb 23, 2018 12:27 pm 
Offline
Victor V
User avatar
Joined: Wed Dec 01, 2010 2:27 pm
Posts: 2667
Location: Northeast Pennsylvania
Jim,

Thanks for sharing your observations... I find this very helpful regarding Orthophonic taxonomy.

:)

Frank
De Soto Frank


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 28 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Americanized by Maël Soucaze.