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Another MB-40 tech question




 
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Author Topic: Another MB-40 tech question  (Read 343 times)
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kc2we
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« on: June 18, 2020, 10:14:57 AM »

I am looking for a scan of an advertising page by National Radio.
QST Dec 1950, page 77. A description of the National MB-40L Tank Circuit.

Since itís an advertisement itís not found during a search on the existing library of documents since itís not actually an article.
Sine ARRL staff is working from home, there's no way to get this from the ARRL until further notice. If you have this QST and can scan one page, that wud be great. Tnx in advance. kc2we@arrl.net
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Seth Taylor
WD5JKO
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WD5JKO


« Reply #1 on: June 18, 2020, 11:58:34 AM »


I'm not sure if you have these, but I attach two files.

Jim
Wd5JKO


* MB150_ad.jpg (78 KB, 500x473 - viewed 80 times.)
* MB40SL_AppNotes.pdf (533.06 KB - downloaded 42 times.)
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WA4WAX
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« Reply #2 on: June 19, 2020, 09:51:40 AM »

I will scan or photograph the Nose article.

The 40 is a trouble maker in grid tank service without his mods.  One part is removing that ground strap.  He explains all in detail.

February 1956 QST.

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kc2we
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« Reply #3 on: June 19, 2020, 11:06:51 AM »

Tnx for the heads up on the 1956 QST article. ST
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Seth Taylor
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Patrick J. / KD5OEI
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« Reply #4 on: June 21, 2020, 09:25:13 PM »

If you don't get enough drive on the high band side, a small 2 turn pancake coil of #14 or 16 placed in between the two sections of the HF coil is a good place to inject your drive. will need a switch 80-20M / 15-10M

in schematic, disregard everything except the MB-40 notes about the added winding.


* MB40-4-1000.png (51.12 KB, 1085x679 - viewed 36 times.)

* coil3.jpg (79.74 KB, 640x480 - viewed 35 times.)

* coil2.jpg (69.03 KB, 640x480 - viewed 37 times.)
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