The AM Forum
May 18, 2024, 03:14:03 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
« previous next »
  Print  
Author Topic: Ball Chain Source  (Read 565 times)
0 Members and 1 Guest are viewing this topic.
wb3eii
Member

Offline Offline

Posts: 66
« 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?
 --... ...--
Logged
Chuck...K1KW
Contributing
Member
*
Offline Offline

Posts: 162
« 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
Logged
73, Chuck...K1KW
Carl WA1KPD
Contributing
Member
*
Offline Offline

Posts: 1641
« 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?
Logged
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
Member

Offline Offline

Posts: 771
« 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.
Logged
"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 1100
« Reply #4 on: May 06, 2024, 07:43:44 AM »
This would make an interesting episode of “How it’s Made”
Logged
Pages: [1]   Go Up
  Print  
The AM Forum  > THE AM BULLETIN BOARD > Technical Forum > Topic: Ball Chain Source
 « previous next »
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.032 seconds with 17 queries.