[klondike98]

Terry, morzh and Mondial, many thanks for your advice! I finally solved the problem by tacking a 0.1uF cap across the cap circled in red in the photo.  When I pulled the bakelite block associated with that cap I realized I had wired the block backwards, instead of the caps being across lugs 1&2 and 1&3 I had them as 1&3 and 2&3, yikes  Playing pretty well now, can probably use some alignment etc., but at least I'm in the ballpark again.

[Image: https://www.dropbox.com/s/cdmvn6uub5ni1g....jpg?raw=1]