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| Perforated Tape https://8mmforumworldwide.com/viewtopic.php?f=7&t=258 |
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| Author: | Martin Jones [ Sat Sep 17, 2011 7:17 am ] |
| Post subject: | Perforated Tape |
I've put this on General Discussion, as it is not related to any specific gauge of film, rather to adding sound to any film. I have 2 Spools of Recording Tape made to be used on a Craven Syncrodek. They are made by Ampex, are Unused and on 7 inch standard spools. I do not know the length (and I'm not going to measure it!) but I would assume it's Standard play tape and the spools are full. The interesting thing is that the tape is PERFORATED with 18 perforations every 3.75 inches, and is designed to run in sync with a projector at 18 fps. Actually the other way round as the perforations produced 18 pulses per second when the tape is played at 3.75 in/sec, using a photocell to read them. The Syncrodek compared these with the pulses from a reed switch operated by a magnet mounted on the projector main shaft, and controlled the projector speed to obtain synchronization. The perforations occupy track 3(or 2) on the tape; tracks 1,2(or 3) and 4 can be used for recording. I've actually got a Syncrodek unit and a modified Eumig 824 HQS, but I've never used the unit for this purpose. I actually used it as a fine speed control for the Eumig when transferring to Video "on the fly". I am considering putting the tapes, and possibly the unit, ( but not the Eumig!) on EBay, but I thought they may be of interest on the Forums first. So, is anyone interested in making an offer or offers? Happy to answer questions. |
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