[Electronic M]

Well I tried the swap about a week ago and the results seem to be no/inconclusive.

A couple of the 2-pin connectors ton the topside do not seem to be the same place or letter. I did hook it up and nothing was damaged, but only got ~5-7KV of HV and no sound. I then put the working 030 variant back into the working 13" set it came from and that continued to work (so no harm done). I then examined the non-working 05 variant, and found a major coil had badly cracked solder lugs, and decided to re-touch all bad looking solder joints as a final try/courtesy before junking it. That fixed the audio hum, but got me no HV so before throwing up my hands in disgust with the set on I wiggled some of the connectors on the back of the 9-190-05 and it suddenly came to life.

There may not be interchange in the way I wanted, but I did get both sets working.