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Author Topic: U47 Bell - Tuchel Connector Jam Nut Size?  (Read 154 times)

vinylwall

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U47 Bell - Tuchel Connector Jam Nut Size?
« on: January 22, 2023, 02:33:45 PM »

Hello all.  I'm hoping someone can tell me the size and thread count of the jam nut used to mount the Tuchel connection into the bottom bell of a U47/U48.   ???   Thank you.
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klaus

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Re: U47 Bell - Tuchel Connector Jam Nut Size?
« Reply #1 on: January 22, 2023, 06:40:27 PM »

I measured several NOS Tuchel inserts, both, threads on male connectors and female nuts (!), and found a clear match only for the pitch: 1.0MM
But metric tables are a bit less definitive about any M-designation (metric), see table, and I found nothing for inch/Whitworth correlates.

Here is what I measured:
OD of the male connector: one of them is 21.60mm black, NOS original), another (newer, NOS Amphenol-made) 21.74mm
ID of the original nut: 20.91or thereabout for both versions.

The metric thread table below identifies the closest match as "M22x1 6e"
Inch table have only 7/8" in the general vicinity but nothing close. I also perused a Whitworth table and nothing there either.

I will contact Martin Schneider of Neumann to find out what they may have.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

schneidm

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Re: U47 Bell - Tuchel Connector Jam Nut Size?
« Reply #2 on: January 23, 2023, 03:33:55 AM »

Hello,

the part was provided by Tuchel. The historical documentation just specifies: Tuchel T2810 M 22x1, compression moulded nut, without any further details.

Best regards,
Martin Schneider
Acoustics Development
Georg Neumann GmbH
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vinylwall

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Re: U47 Bell - Tuchel Connector Jam Nut Size?
« Reply #3 on: January 23, 2023, 08:15:33 AM »

Thank you for this information.  Take care all.
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klaus

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Re: U47 Bell - Tuchel Connector Jam Nut Size?
« Reply #4 on: January 23, 2023, 09:44:53 AM »

Good to know, at least that it's an M22x1.
Try that size nut and let us know how it fits.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com
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