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Author Topic: Ball Chain Source  (Read 1005 times)
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wb3eii
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« on: May 05, 2024, 03:38:58 AM »

Can anybody point me to the correct chain that is used on the band change mechanism for the National Nc-300 receiver?
 I have tried a few different 'new' chains, and I believe the ones currently being made are of a slightly different pitch or size, compared to the remains of the original chains.
 So I'm probably looking for some new-old-stock type of deal, someone who has a reel of this stuff dating from 50 years ago.
 ANYONE?
 --... ...--
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Chuck...K1KW
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« Reply #1 on: May 05, 2024, 11:07:44 AM »

Hi,

I don't know what the correct chain is but if you know its dimensions try matching them to the many varieties available at McMaster Carr here:

I would think a "standard" size was used even back then!

https://www.mcmaster.com/products/ball-chain/

-Chuck
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73, Chuck...K1KW
Carl WA1KPD
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« Reply #2 on: May 05, 2024, 02:05:11 PM »

The new ones are all metric. You can substitute, but the drum will not be in alignment on all bands.
Maybe someone has a parts unt?
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Carl

"Okay, gang are you ready to play radio? Are you ready to shuffle off the mortal coil of mediocrity? I am if you are." Shepherd
KD1SH
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« Reply #3 on: May 05, 2024, 03:18:35 PM »

  You might check with these guys:
https://www.ballchain.com
  Made in the U.S, apparently, and the sizes they list are given in standard SAE values, not metric, although they do indicate the metric equivalents.
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"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
WA2SQQ
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« Reply #4 on: May 06, 2024, 07:43:44 AM »

This would make an interesting episode of “How it’s Made”
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KW6T
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« Reply #5 on: Yesterday at 12:11:35 AM »

"Wirelessgirl.com" discusses this item in her page on NC-303 but has no source. 

An Amazon search for "ball chain" yielded a lot of results and sizes (of balls, I presume) 2.4mm, 3.0mm, 3.2mm, 4.5mm, #10, #8, etc.  The pitch is likely going to be the bugger.  If you can match the ball size, perhaps you can interpolate/approximate the pitch size in the photo.

if you find a suitable chain, please post the source.
Regards,
Russ
KW6T
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WA4WAX
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« Reply #6 on: Yesterday at 08:26:44 PM »

Have a look guys!

https://www.ballchain.com/chain-sizes/

Speaking of balls and chains:

You can almost smell the cigarettes and the Southern Comfort.

:-)


https://www.youtube.com/watch?v=X1zFnyEe3nE

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KD1SH
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« Reply #7 on: Yesterday at 09:10:55 PM »

As I posted back on May 5th, further up the thread.
Never saw a reply from the OP, so I don't know if it worked for him.

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"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
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