Thanks for the responses.

Seems like the older sets were far more forgiving when it comes to
disconnecting the yoke.

I have already tried using the vertical of the 9" mono monitor, which
produced a result, but as JW posted, you need a fair bit of volume to
do it.

I haven't yet tried the horizontal. Will look at the option of an
inductor and series load. and also look out for the magazine circuits
NSM suggested for the colour.-

will post with results at a later stage!

regards, Ben