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Author Topic: 1930's DeVry Theater amplifier Ian Shackleford Film Handler Posts: 2 From: west bloomfield michigan Registered: Jul 2010 posted 07-30-2010 01:46 AM                     Hello, I collect and restore antique radios and similar items. I picked up a Devry theater amplifier the other day, and can not find anything about it. The largest (power) transformer says 144H 110volts 60cy 100w. That seems to me to be the model , 144h. The amp is from ~1930. it uses 2-57's or 58's 3-45's and an 80. Some one also added a 6v6 and a small 6.3v filament xformer at some point. The Amplifier has a slanted face, and a large orange celluloid control panel, that is illuminated and 4 knobs. I am looking for the schematic and any information related to this. Thanks, Ian  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 07-30-2010 01:25 PM                     Hi Ian and welcome to Film-Tech. You'll find a lot of helpful (and colorful) characters here. The part number of the transformer makes me think it is a re-badged Western Electric or even Altec amp. You can try looking up some Western Electric or Altec amps with the same tube compliment and I'm willing to bet you'll get a schematic that will work. I wish my colleague Conrad was still alive, he knew all about that older gear.  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 07-30-2010 01:32 PM                     I'm guessing that 6v6 and xfrmr may have been part of an oscillator circuit for the exciter lamp supply or perhaps the phantom voltage for an old photoelectric sound pickup.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-30-2010 07:23 PM                     Devry did use a high frequency AC excitor lamp powersupply  |  IP: Logged Ian Shackleford Film Handler Posts: 2 From: west bloomfield michigan Registered: Jul 2010 posted 07-30-2010 10:00 PM                     The 6v6 Really does NOT belong in the amp. It is clear it was a later addition. The transformer powering its filament is from a company that made replacements for things. The Amp has mic and phono inputs, tone control, master volume, mike/phono volume, and an on off switch. It seems that it is only for the sound, and not for the projector.  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 07-31-2010 09:19 AM                     Understood--just opining as to why someone added it and what purpose it was added to address.  |  IP: Logged

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