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 Just finished an NC-183

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Wcirco

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Join date : 2010-10-12
Age : 22
Location : naptown

PostSubject: Re: Just finished an NC-183   Thu Oct 14, 2010 1:04 pm

Lee,
Im looking at the set now and it says: 241 0212.
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W6UN

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PostSubject: Re: Just finished an NC-183   Thu Oct 14, 2010 1:51 pm

Wow and mine is 241 0586. Looks like our two 183's were built within a few weeks of each other. I'm guessing that it was probably 1951 since ER200 must have been sometime in 1947. Ours were pretty far along in the production cycle.

One thing that is different from the "early" versions is the crystal filter design. The original had only slug tuned input and output adjustments. Our version has an added adjustment hole for a trimmer capacitor that apparently compensates for the holder capacitance of the crystal. The design was apparently carried further in the NC-183d which has TWO trimmer capacitors to compensate for both input and output reactance. If you have the original book for your Engineering Release number, it contains the added instructions for the Crystal Filter trimmer capacitor. All I have been able to locate is the bama download for the ER 202 version.

Thanks for looking.

Regards,

Lee W6UN
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w8who

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PostSubject: New member First reply posted   Thu Oct 14, 2010 5:12 pm

Nice NC-183. I have a National NC-173, NC-125,NC-98. I love the audio from the National radios. I havent restored any of these yet. They are in good shape and seem to work ok.
I have one matching speaker on the NC-173 and connect it to what ever one I want to listen to.
Been watching for another National speaker on Ebay but they go very high.
Thanks for sharing.
I think this forum is cool and hope to use it much more. I just love the vintage equipment
Cliff
W8WHO
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W6UN

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PostSubject: Re: Just finished an NC-183   Thu Oct 14, 2010 10:09 pm

I really admire your collection, Cliff. Especially the NC-173. You got a real winner there! Enjoy and expand <G>.

73's,

Lee W6UN

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burnt fingers



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PostSubject: Re: Just finished an NC-183   Fri Oct 15, 2010 5:43 pm

Im a bit biased toward National having worked there 1963-69 but I have many other makes and models in the collection and/or in use.

The Nationals are AGS-X, FB-XA, A first run 1935 HRO, NC-101X, NC-200, NC-240CS, NC-240D, NC-46, NC-173, NC-183, NBS-1 (a NC-183 variant), NC-183D, NC-300, HRO-50, HRO-60 and HRO-500/LF-10. Also a RBL-5 military LF to VLF.

Carl
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W6UN

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PostSubject: Re: Just finished an NC-183   Fri Oct 15, 2010 8:45 pm

Holy Moly! You must have had to have your floor reinforced to support all that iron in one room! It's a real candy store (big sigh, look of remorse). Makes me wish I had started collecting back before Ebay started driving up the prices...

Great list, Carl.

Best Regards,

Lee, W6UN
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PostSubject: Re: Just finished an NC-183   Sat Oct 16, 2010 8:02 am

Not quite Lee! The better ones are stacked in operating positions in the basement, some others are resting in the attic and the funky NC-46 is in the kitchen eating area with matching speaker where the PP 25L6's sound good on the BCB or 160-40M AM...its not a serious radio for hamming.

I use the FB-XA and a WW2 Meissner Signal Corps VFO (part of the 150B package) as the 30M QRP station; a BC-453 adds the needed selectivity.

Carl
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