Need Help with Building Antennas for Etherwave Pro

Hi everyone!

I’m currently working on figuring out how to rebuild the antennas for my Etherwave Pro, which were unfortunately stolen. I’m looking for technical drawings or any documentation to help me create the pitch and volume control antennas. Any advice on design, materials, or the process of building them would be greatly appreciated.

If anyone has experience with building or replacing these antennas, please share your drawings, tips, or ideas! I’d also be thankful for any recommendations on tools or methods for the job.

Thanks in advance for your help!

 linkRepor

Hi Mykyta,

A while back someone who owns an EPro sent me the following information regarding the pitch arm guts, hope this helps:

Inside is a string of coils in series:

Input
11mH (with trimcap in parallel with it)
4.7mH
11mH
11mH
Antenna

Total of ~38mH

Current value of the trimcap is on the order of 4.7pF

Henk Brand knew the EPro inside out, but unfortunately he died recently. Thierry knows it well too.

The first thing you will need to do is figure out which pitch antenna you will need to replicate. At some point, the threading for the antenna went from a fine thread (3/8-32) to a more coarse thread (3/8-24). The finer thread is 3/8 long from the end, but the coarse thread end has some more intricate machining called out on Moog's fabrication documents.

The other things you're going to need are:
A lathe to turn the "TRS" volume end part and for turning the cap for the pitch antenna. If you're not familiar with single point threading on a lathe you'll want to get a die for threading the pitch antenna connection.
An oxy-acetylene torch or something that can get the brass hot enough to anneal it for bending the volume loop.
A way to pack and seal the tube (such as sand) for bending.
A bending jig (which takes into account springback of the brass) and a lot of patience.
A milling machine for facing the ends of the antenna loop.
A buffing wheel and polishing compound.
And a way to nickel plate the components (can be done at home with simple equipment and materials).

I have built Etherwave Pro as well as Ethervox, 91A, and RCA Theremin replica antenna sets. See the following links for a EPro volume loop that I did a few years ago.
https://www.instagram.com/p/CqhCb4Vu6q0/
https://www.instagram.com/p/CrhYLh5uphj/
https://www.instagram.com/p/CsExzgxuitx/
https://www.instagram.com/p/CsWaowmx8vQ/
https://www.instagram.com/p/Cs_-CVLAVce/

I could sell you a set, but it would be very costly and it would take some time until I could make it for you.

Mike