Everyone who has built a theremin (or tried) knows how hard it can be to find those pesky tunable coils. Here are a few possibilities:

Coilcraft (a.k.a. Inductors.com)

Coilcraft has a wide variety of inductors available. You can even order samples.

Bell Industries, Inc.

J.W. Miller coils are mentioned in many schematics. I have been told that the ones needed (#9001 series) are non-standard and therefore rather expensive.

   Bell Industries, Inc.
   J. W. Miller Division
   306 E. Alondra Bl.                     
   Gardena, CA  90248-2810
   Phone (310)515-1720

Ocean State Electronics

Ocean State sells forms for winding your own coils. The ranges aren't perfect, but they should be close enough to do the job.

   Ocean State Electronics
   P.O. Box 1458
   Westerly, RI  02891

Electrosonics

Barry Eso of the Theremin Enthusiasts Club International bought his coils here.

   Electrosonics
   Vancouver BC, Can.
   (604) 273-2911

Piconics Online Inductor Catalog

This company offers a wide range of inductors and coils. You may find some of those hard-to-locate theremin parts here.

Some Other Parts Distributors:

• Farnell Electronic Components Ltd (UK)
• Digi-Key (USA) - Digi-Key carries a large supply of parts for the DIY'er. They have extremely fast turn around on in-stock parts too!
• Newark Electronics - Another excellent mail-order house with a HUGE catalog.

A long list of electronic parts mail-order companies that handle small quantity orders.

Yahoo's List of PCBoard companies - For those of you interested in having your theremin's PC board professionally made.