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R/E/P => Klaus Heyne's Mic Lab => Topic started by: vinylwall on January 22, 2023, 02:33:45 PM

Title: U47 Bell - Tuchel Connector Jam Nut Size?
Post by: vinylwall 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.
Title: Re: U47 Bell - Tuchel Connector Jam Nut Size?
Post by: klaus 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.
Title: Re: U47 Bell - Tuchel Connector Jam Nut Size?
Post by: schneidm 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
Title: Re: U47 Bell - Tuchel Connector Jam Nut Size?
Post by: vinylwall on January 23, 2023, 08:15:33 AM
Thank you for this information.  Take care all.
Title: Re: U47 Bell - Tuchel Connector Jam Nut Size?
Post by: klaus 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.