I swapped hundreds of 9-160's
IIRC -03 subs to -05
-04 subs to -06
there was also a -08 ( rare) that subbed back to one of them.
An 05 or an 06 will sub ANY 9-160 between them.
IIRC you can not put the wrong one in due to the
yoke plug without forcing it & busting the skt.
IIRC also the newer subs used a multivibrater to kick
start the set & the old ones a transformer etc.
On some, remotes IIRC there is also a cable that gets
left off on a sub. Plugged on top & had 2 wires. Just
tie it off out of the way.
73 Zeno
