Sorry to zombie your post - New Zealander here, the Jansen & Gunn/Holden stuff is continuously fascinating to me
I love that the same way the Dumble/Roy Bros. partnership fell apart in the early 80's over proprietary circuits was what happened to Jansen and Fender, yet Jansen were literally...
"Oh my god! Does it have the Vietnamese transformers like Jeff Beck's back-up?!" or something to that effect lol
edit: whoops, forgot the /s for sarcasm