The headset adapter Is MC-385-C (says for use with Headset HS-33 or HS-38).  It is an autotransformer stepdown to 600ohms. I measured 6600ohm input Z when loaded with 600ohms.  Mine is made by Rola under a 1944 order.  1/4" male in and 1/4" female out.

Here is a pic I borrowed from eBay.  Quicker than photographing mine.
image.png

Dennis AE6C

On Tue, Dec 30, 2025 at 6:44 PM Hubert Miller <Kargo_cult@msn.com> wrote:

8000 ohms seems so old-world, like 1920s radio.
I have some kind of small ‘impedance adapter’. I don’t know where it is right now or the item designation.

But i think it’s nothing but a pot inside.

-Hue Miller

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