Sam, believe it or not, the 5-Star, if properly set up, isn't the tight loop soundhead. It is all in the spring tension on the damper roller and the damping fluid. When one gets it right, there should be a slight bowing of the film as it enters the pinch roller. You can use a spring scale to set the return spring tension but the "field" way of setting it is to turn the roller assembly 90-degrees so the spring is trying to pull the roller up. It should have just enough strength to overcome gravity but barely. Bend both ends of the spring to achieve this. Make sure the damping fluid is well applied but don't go crazy as it will be messy anyway. Reinstall the assembly and it will track loads better and you'll see that the film is no longer under tension feeding into the the pinch roller.
With that said, I agree with Brad, there is no way to run a Simplex (or RCA) soundhead without damaging the emulsion of the film. The mod that Brad refers to removes the pinch roller, which will preclude the drum from being up to speed in time for the changeover and will also prolong the time the leader and picture will be slipping on the sound drum. It can work for platter houses because the leader can be as long as it needs to be to get the drum up to speed.
With respect to other film damage...I could go down section by section of which part is better worse on each brand of machine. There is no reason that a Simplex should have a dirtier print (aside from the pinch roller) than Century. I don't care to get into it right now as it won't amount to a hill of beans. Suffice to say, I prefer Simplex, most respects to Century, particularly on the gear side. My biggest beef with Simplex is that the pinch roller contacts the film...right in the picture area. If the pinch roller were redesigned with a mating drum (sort of like Kinoton did with the RSSD), that would remove the issue. Simplex does have to contend with oil so it is possible to have the oil get onto the film, which will attract dirt to stick to the film.
With that said, I agree with Brad, there is no way to run a Simplex (or RCA) soundhead without damaging the emulsion of the film. The mod that Brad refers to removes the pinch roller, which will preclude the drum from being up to speed in time for the changeover and will also prolong the time the leader and picture will be slipping on the sound drum. It can work for platter houses because the leader can be as long as it needs to be to get the drum up to speed.
With respect to other film damage...I could go down section by section of which part is better worse on each brand of machine. There is no reason that a Simplex should have a dirtier print (aside from the pinch roller) than Century. I don't care to get into it right now as it won't amount to a hill of beans. Suffice to say, I prefer Simplex, most respects to Century, particularly on the gear side. My biggest beef with Simplex is that the pinch roller contacts the film...right in the picture area. If the pinch roller were redesigned with a mating drum (sort of like Kinoton did with the RSSD), that would remove the issue. Simplex does have to contend with oil so it is possible to have the oil get onto the film, which will attract dirt to stick to the film.
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