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National NC-125
#1

I just started work on my National NC-125, an 11 tube communications receiver. The manual and schematic can be found here: http://bama.edebris.com/manuals/national/nc125/  for those who want to follow along. This is how it looked when I first received it:

[Image: https://64.media.tumblr.com/7f56a0296e9b...922566.jpg]

When I got it, the main tuning dial had a problem which I quickly managed to fix, just a minor mechanical snag. Then I ordered a complete set of condensers for the radio from: https://hayseedhamfest.com/ . This guy is a great source of custom made electrolytic condensers which will fit into older radios and have higher specs than the originals. Now that I am finished with my SW-54 adventures, I got back to work on the NC-125. Today, to begin with, I replaced the one two section can. The work went very smoothly. Here are some pictures. First, the whole underside of the chassis before any work:

[Image: https://64.media.tumblr.com/21deea236ef7...315439.jpg]

Next, a close up of the underside showing the two section electrolytic before replacement:

[Image: https://64.media.tumblr.com/096115084e19...c9ee1b.jpg]

And last a close up of the underside showing the replaced two section electrolytic:

[Image: https://64.media.tumblr.com/c51f3be833c9...d18233.jpg]

I find the liberal use of rosin flux, applied with a little artist's brush, very useful in de-soldering and soldering, especially to large lugs. I make it by dissolving crushed up violin rosin in 91% isopropyl alcohol from the dollar store.


Messages In This Thread
National NC-125 - by mikethedruid - 01-19-2021, 02:01 PM
RE: National NC-125 - by mikethedruid - 01-19-2021, 06:46 PM
RE: National NC-125 - by Arran - 01-19-2021, 09:31 PM
RE: National NC-125 - by mikethedruid - 01-20-2021, 10:16 AM
RE: National NC-125 - by mikethedruid - 01-20-2021, 10:09 PM
RE: National NC-125 - by mikethedruid - 01-21-2021, 12:53 PM
RE: National NC-125 - by mikethedruid - 01-22-2021, 12:20 AM
RE: National NC-125 - by mikethedruid - 01-22-2021, 08:48 PM
RE: National NC-125 - by EdHolland - 01-23-2021, 12:38 AM
RE: National NC-125 - by mikethedruid - 01-23-2021, 02:05 PM
RE: National NC-125 - by mikethedruid - 01-24-2021, 02:30 AM
RE: National NC-125 - by mikethedruid - 01-27-2021, 11:44 AM
RE: National NC-125 - by Radioroslyn - 01-27-2021, 01:36 PM
RE: National NC-125 - by Eliot Ness - 01-28-2021, 11:24 AM
RE: National NC-125 - by mikethedruid - 01-28-2021, 03:44 PM
RE: National NC-125 - by GarySP - 01-28-2021, 04:29 PM
RE: National NC-125 - by mikethedruid - 01-28-2021, 04:46 PM
RE: National NC-125 - by mikethedruid - 01-29-2021, 09:50 PM
RE: National NC-125 - by Paul Philco322 - 01-29-2021, 11:07 PM
RE: National NC-125 - by MrFixr55 - 04-03-2021, 09:44 AM
RE: National NC-125 - by mikethedruid - 04-03-2021, 05:28 PM
RE: National NC-125 - by Mtmattking - 11-13-2022, 09:44 PM
RE: National NC-125 - by Radioroslyn - 11-14-2022, 02:06 PM
RE: National NC-125 - by Mtmattking - 01-17-2025, 11:56 PM
RE: National NC-125 - by radiorich - 01-18-2025, 01:50 AM
RE: National NC-125 - by Mtmattking - 01-18-2025, 02:01 AM
RE: National NC-125 - by radiorich - 01-18-2025, 03:13 AM
RE: National NC-125 - by morzh - 01-18-2025, 10:46 AM
RE: National NC-125 - by GarySP - 01-18-2025, 11:04 AM
RE: National NC-125 - by radiorich - 01-18-2025, 11:08 AM
RE: National NC-125 - by Mtmattking - 01-18-2025, 07:46 PM
RE: National NC-125 - by GarySP - 01-18-2025, 08:52 PM



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