Need Info on SW-4 National

Dave Hollander davidh at GETNET.COM
Wed Jan 6 21:27:45 EST 1999

Got lucky and just obtained a pretty nice old National SW-4 with power
supply and one set of coils. Does anyone have a schematic and can any one
enlighten me on the coil situation. The coil set I have has a red dot on
the bottom and they look to me like higher frequency coils. What
frequency range is the red dot? Where if anywhere can one obtain coil
forms and dimensions to wind the lower frequencies or am I dreaming?

One thing I got a kick out of is  a sticker under the lid that says

In addition to thorough laboratory tests, this set has also been checked
on actual reception from the following distant stations

Station        Location            Date           Time
EAN            Spain               5/18/32        11:00 AM
DGB            Germany

Laboratory Engineer:  Calvin Foos

Jackson Research Laboratories
Malden, Massachusetts USA

Any help would be much appreciated as I am totally unfamiliar with a
radio this old. my oldest is a 1936 Hallicrafters which is much more
modern in circuit terms.

Thanks and 73 and Happy New Year,

Dave Hollander N7RK


Dave  N7RK -  Webmaster CADXA
Phoenix, Arizona         *DXCC Honor Roll*    *WAZ#23 - 75 Meter SSB*

                 ex-N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX

Boatanchor Collector Extraordinaire preferring Hallicrafters, National
and what ever else looks interesting!

E-Mail: davidh at
My Home Page:

Visit the Central Arizona DX Association Home page -

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