Thanks. I did find some references to one, an MFJ-950K3 / MFJ-950K. I couldn't find any place that had them for sale. I did find a couple of reviews so I'm guessing they produced them at one point.

Thanks
Ken
WR7D

MFJ made (makes?) an internal tuner board for the K3.  Not sure if it is still available.

Just acquired an Elecraft K3S, but it doesn't have the internal tuner. If you've got a spare laying around or have one installed but don't operate barefoot, I'm interested.

Thanks
Ken
WR7D