Repairing a Moog Etherwave plus

Posted: 8/22/2025 10:29:40 PM
GalahadIV

Joined: 8/22/2025

Hello guys,

I have a Moog Etherwave plus theremin that I have upgraded with the ethermagic ESPE-01 module, however I managed to break the L6 coil whiel adjusting it and am looking to replace it. Problem is, it is a CoilCraft SLOT TEN-5-10 and I cannot seem to find it anywhere for sale. I was wondering if someone might have a clue where I could find some, or have some lying around that they are willing to spare (I am willing to pay), or if there is perhaps a suitable alternative.

Thanks in advance!

Posted: 8/25/2025 2:36:49 PM
DreadVox

From: The East of the Netherlands

Joined: 6/18/2019

Did you damage the actual coil, or, what's far more likely, used some inappropriate tool and broke the ferrite slug? If the latter is the case, the best option is to find a replacement ferrite slug that fits the L6 coil (and the proper plastic tool to adjust it without breaking it).

Posted: 8/25/2025 3:03:55 PM
GalahadIV

Joined: 8/22/2025

I guess I broke the ferrite slug inside. I do have the plastic tool, I was a bit ignorant at first though and used a metal 
hex key. Is the ferrite slug a standard size? And do I guess correctly that I would have to desolder and take apart the inductor and thread a new one in?

Posted: 8/25/2025 3:20:46 PM
GalahadIV

Joined: 8/22/2025

I guess I broke the ferrite slug inside. I do have the plastic tool, I was a bit ignorant at first though and used a metal hex key. Is the ferrite slug a standard size? And do I guess correctly that I would have to desolder and take apart the inductor and thread a new one in?

Checked the datasheet, it appears to be a 5mm diameter ferrite slug, and I think it might just thread in from the top if I understand correctly, so I'll try to see if I can find some on aliexpress and replace it, thanks for the help!

Posted: 8/26/2025 1:19:39 AM
oldtemecula

From: 60 Miles North of San Diego, CA

Joined: 10/1/2014


Knowing what city, you are in might lead to better advice. I have a EWS board once used for experimenting you could remove the ferrite slug from.

If you try to un-solder the IF Transformer you will destroy the board, the copper traces are like tissue paper.

Use a magnet to lift out the ferrite pieces, give it a minute to then demagnetize.

An experiment is to tack on a 10pf (20pf) variable capacitor across the L43 coil that stands up.

Amazon
https://www.amazon.com/dp/B01N5KP1WG?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3

Keep us informed.

Christophe S Becker
Old Temecula

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