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Author Topic: Devry xd help Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 09-21-2014 05:00 PM                     I have the problem described with all prints - mono or dolby. This is for a home cinema.  |  IP: Logged Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 09-27-2014 06:31 PM                     Improved the situation by doing the following: - reduce sound level on radio shack mixer - on pyramid amps: inceease midrange a lot, reduce bass a liitle, increase treble a little Effect is to lower overall sound level but increase voices. Sound quality is mediocre, but i can hear most dialogue now. Wonder if the dolby conversion may have polarity issues or perhaps sound lens focus isnt spot on  |  IP: Logged Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 10-10-2014 04:12 PM                     All I have an opportunity to buy another Devry. It looks like it is in good shape but it is original - no solar cells. The owner does not have the matching amplifier. Question - can i take the output of this unit and plug it into my mic mixer, or does this unit need the original amp to power the old cell?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-10-2014 04:58 PM                     You really need to replace the photo tube with a solar cell. And power the exciter lamp from a proper regulated power supply. Mark  |  IP: Logged Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 10-10-2014 06:03 PM                     Perhaps...although the one i have has a solr cell and i'm not terribly thrilled - that's how this thread started to begin with! Going back to my question - does anyone know if the original phototube requires power from the original amp or whether i can just plug the output right into my standard sound system. If it requires the original amp to power it, which the owner does not have, there probably isn't any reason to buy it.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-10-2014 08:55 PM                     Be sure your solar cell has a low impedance load across it... 600 ohms or less!  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 10-11-2014 10:18 AM                     Yes! The photo tube requires a bias voltage to operate. The impedance is very high. That bias voltage was supplied by the original amplifier power supply. The exciter lamp was operated by a high frequency oscillator in most 16mm projectors.  |  IP: Logged Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 10-11-2014 11:09 AM                     Thank you Kenneth. I guess if i don't have the amp then the projector can't be used. Unless someone knows a technician in the Chicago area that could convert it to solar cells as Mark suggests. .???  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 10-11-2014 03:42 PM                     Check with the folks at International Cinema NTE as they had some Bell & Howell amplifiers from when they built the JAN projectors. Perhaps one of these would work for your purposes.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-12-2014 01:38 AM                     Better yet call James Bond at Full Aperture Systems in Chicago. I am sure he or someone he knows that's also local can help you. Mark  |  IP: Logged Jas Verlen Film Handler Posts: 12 From: Lake Bluff, IL Registered: Aug 2014 posted 10-12-2014 08:53 AM                     Kenneth and Mark - thank you both.  |  IP: Logged

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