Not much further though
I can remember walking into a british bike shop [well known and patronised] in the '80's and there was a big bucket of old Rita ignitions holding the door open.
I also had one on my TSS that was faulty, its the reason I ended up buying it,
I fitted a Boyer
While, by definition, not every AB11 amplifier would've been perfect, it's long been well-known the oe '79-on 5PU pick-up was far more unreliable. Possibly exacerbated by higher ambient and engine temperatures in Oz? Before fitting the "Boyer", did you try a Mistral replacement for the standard 5PU?
"in the '80's", the Co-op having closed, Lucas having been taken over by TRW, advice and new 5PU's difficult or impossible to obtain, dealer mechanics being generally crap at electrical fault-finding and diagnosis, even many British Triumph dealers wouldn't pick up the 'phone to Mistral Engineering when the alternative was the greater financial incentive of flogging the stranded punter a whole shiny new e.i. ...
Absent the internet to inform an Australian dealer that a cheap 5PU replacement even existed, I suspect replacing the whole e.i. with the only alternative probably looked like a 'no-brainer'?
I fitted a Boyer and never looked back.
Mmmm ... the vast majority of "Boyer" owners I came across "in the '80's" had been looking forward ... to their riding mates disappearing down the road ...
Otoh, struggling to remember any stranded Rita owners ...
The reason Steve Kelly began Tri-Spark was he was a T160 owner and, at the time, "Boyer" was the only e.i. available new, "My Boyer doesn't work" letters had filled Club and national magazine 'Help' pages for years (otoh, "My Rita doesn't work" letters were very rare), and were a regular thread title on the then-new internet forums. The 'Classic Twin' e.i. problems might've tarnished Tri-Spark's reputation on this forum but, certainly over on TOL, Steve remains on course for sainthood.
One of the stated reasons Andy left Bransden Electronics to start Pazon was Ernie's persistent refusal to update particularly the Mk.3 analogue. It's noticeable that, since the Mk.3 was superseded by the Mk.4, "My Boyer doesn't work" forum threads have virtually disappeared ...