The PHILCO Phorum
National NC-125 - Printable Version

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RE: National NC-125 - GarySP - 01-28-2021

Nice restoration, Mike. That BAMA schematic would have me reaching for a bourbon bottle in no time at all! Take care, and BE HEALTHY! Gary

RE: National NC-125 - mikethedruid - 01-28-2021

The comment about putting arrows prompted me to do some experimenting using MS Paint. While I may not be able to do arrows, I have figured out how to do ovals, so, in the future I will edit the photos with circles around items of interest. With more practice, who knows, I may even figure out how to do arrows.

RE: National NC-125 - mikethedruid - 01-29-2021

I just made a follow up to my video on the restoration of my National NC-125. This one is a live action demonstration of the receiver. Here is a link to the video:  https://www.youtube.com/watch?v=0J3fWjdvwqI&t=19s

RE: National NC-125 - Paul Philco322 - 01-29-2021

Nice Job, nothing like seeing it in action.

Paul

RE: National NC-125 - MrFixr55 - 04-03-2021

I know that the last comment in the was several months ago, but Nice job Mike!! I have an old National from the (early?) 30 buried in my garage (archeological site). Do not know the model, has plug in coils, a log scale, and is missing the external power supply. I don't believe that it is a Thrill Box. I found it in the Town of Huntington Landfill as a kid. Amazing quality on yours, considering that National started out as a toy company.

On the retirement bucket list, along with Grandma's DuMont RA113, an RCA 721 (not a Vassos), Mom In Law's RCA CTC24 (last of the Roundies) and a 64 Lincoln Continental 4 Door Convertible (among other things).

RE: National NC-125 - mikethedruid - 04-03-2021

Thanks for the kind words, MrFixr55. That National has turned out to be a GREAT receiver. It takes some practice and trial and error to be able to tune in SSB voice using the CWO, but it can be done. I primarily use it for shortwave listening. The "Select-o-jet" circuitry does help with selectivity almost as well as a crystal filter, surprisingly; again, once you get used to using it. I was more used to using crystal filters from my Hammarlunds and the Q multiplier on my Lafayette. If I have my 'druthers" I'll take the crystal filter. Yes, as far as quality, back in the 1950s National was right up there in the second tier after Hammarlund, and, IMHO, a little better than Hallicrafters. You certainly have a nice collection of projects to keep you amused. Keep us informed of how you progress with them.

RE: National NC-125 - Mtmattking - 11-13-2022

I have re capped my NC125.  Does the Signal Strength Meter NOT work when switched to CWO?  That is what I am seeing as I work on my unit.  Thanks.

RE: National NC-125 - Radioroslyn - 11-14-2022

I suspect that it doesn't. Older sets w/o a product detector the bfo would cause the S meter to read the signal level of bfo rather than the level of the incoming signal.
Some sets when the bfo is turned on the S meter is turned off.

RE: National NC-125 - Mtmattking - 01-17-2025

I have recapped my NC 125.  I had poor reception until I replaced the speaker wires.
This worked until today.
Suddenly I lost all reception.
The radio has solid tones with a signal generator on all four bands.
Ideas?
I had been working with my old headphones (they are toast).


RE: National NC-125 - radiorich - 01-18-2025

Hello Mtmattking,
Have you checked the tubes and far as being re-capped did you do both the coupling and electrolytic capacitors also did you check the resistor values .

Sincerely Richard

RE: National NC-125 - Mtmattking - 01-18-2025

I recapped (using a kit) and tested/replaced the tubes.
I will check the resistors.
The sudden loss of reception is what puzzles me.

RE: National NC-125 - radiorich - 01-18-2025

Hello Mtmattking,
yes, something changed like a component changed in value do you have any spare known tubes you might change out and also do you have the schematic and good meter to test for voltages ?

Sincerely Richard

RE: National NC-125 - morzh - 01-18-2025

A suggestion:

- The thread has long been dead.
- The owner of the thread's status is "banned".
- There's more than one NC-125 in the world, same as Philco 90 or Zenith 1000Z.

Every radio deserves its own thread. Reviving old threads, while not exactly against the rules, but...why? If there is a serious discussion of what is done to this radio, the new thread would be needed anyway.

RE: National NC-125 - GarySP - 01-18-2025

I agree with Mike. A new set of circumstances is best served by presenting them in a new thread. Feel free to reference an old thread for comments and such, but starting a new thread to address your particular issues is recommended. Take care and BE HEALTHY! Gary

RE: National NC-125 - radiorich - 01-18-2025

Hello morzh and gary,
You are correct anyway hopefully Mtmattking reads this.
Thanks gentleman .

Sincerely Richard