It's this "internet" Erik. Makes it so much easier to connect with everyone around the world and ask questions when my/our/your experience lets us down. In the 1980's I decided to learn about basic electronics and then a few years later it became necessary to learn about computers so I could repair my own. It's surprising how electronics and also computers change so rapidly that things learned previously can be contradicted a short while after being understood. The same now applies to movie projection with the closing of film and the dawning of the digital era. It's great to have a forum such as this, to help others and to be helped. You mentioned starting your interest with movie projectors at the age of 11 or 12. My interest also began at age 11 when I got a job selling icecreams in our local cinema and at the same time started to learn about running the Zeiss Ikon Ernemann 5's that the cinema had bought not long before that time, to replace a pair of Ernemann 2's. That was 1955. Another cinema business I later bought, had a pair of Walturdaw 5 projectors, which were a copy of Ernemann 5's but the Walturdaws didn't run as well as the Zeiss machines and leaked oil as well.
Anyway, this thread may now be a bit off topic, so I'd better return to the matter of the sound heads. The ones I'm getting from Australia are new and the low cost makes the whole job worthwhile. The ST180 is in near new condition and the sound heads from the ST600 I mentioned earlier are working as they should, so the new ones will go into the ST600 saving me the task of swapping back the old ones.
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