Balun Component Sources in U.S.A.

• TOROIDS (first)
• WIRE  (below)

TOROIDS:

Amidon to Fair-Rite Part Number Conversion

DISCLAIMER:  To the best of my knowledge, the data above is accurate.  But I have not tried to order each and every one to find out.  Please do your own due dilligence.

Arrow.com   Ferrite Toroids (Fair-Rite/Amidon, Ferroxcube)

Search by manufacturer's part number. 

For FT-140-xx cores, search on:  59*002701 

For FT-240-xx cores, search on:  59*003801  

Kent Coropration   Hollow Ferrite Rods (#31)

KF7P Metalwerks   Ferrite Toroids and Beads,  Misc. Hardware,  Heat-Shrink tubing

Kits and Parts dot Com  (The Toroid King)  A source for many common Toroids.

Mouser Electronics

(Important:  Amidon is not a manufacturer, they are a reseller.  Don't bother to search on the Amidon part number - i.e., "FT-240-43")

In this case you must search on the Fair-Rite part number, not the Amidon part number.

• FT-240-31  =  2631803802
• FT-240-43  =  5943003801 

TEFLON-INSULATED WIRE:

Here are several sources, no particular order and no personal experience with ordering from any of them:

• https://bulkwire.com/ptfe-high-temperature-stranded-wire 

• https://www.rfparts.com/tef16.html 

• https://www.ebay.com/sch/i.html? 

Enamel-Insulated Wire (Magnet Wire)

Here are several sources, no particular order and no personal experience with ordering from any of them:

• Remington Industries

• ebay  (search on Magnet Wire)

For Teflon Tubing:  Search on "Teflon Tubing" in ebay.

TEFLON-INSULATED COAX

WARNING:  Several cheap Teflon-insulated coax cables sold on ebay are not suited for use in baluns.  Using it can result in high SWR.  Use only good name-brand coax.

• THE WIREMAN  (www.thewireman.com) 

• The RF Connection  (rfconnection.com)