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Author Topic: RCA Dual Amplifier MI 9263 Charles Murphy Film Handler Posts: 2 From: Exchange WV USA Registered: Jul 2011 posted 04-05-2013 03:06 PM                     I recently dug up an old RCA amplifier in our theatre. The tag reads MI-9263 200 wat Dual Amplifier. I opened it up and all of the tubes are inside, I have no way of testing them at this time. Can anyone tell me anything about this equipment?  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-05-2013 03:36 PM                        Ah, yes! MONO sound. See if tubes include 2-6L6, 5U4, 2-6J7, maybe 6SN7. I can't remember all the MI-numbers. If I am right, there are serious collectors for that amp. Louis  |  IP: Logged Donald Brown Expert Film Handler Posts: 131 From: Lincoln, DE Registered: Sep 2009 posted 04-05-2013 04:03 PM                     On RCA parts, the number is preceded by the prefix MI. Does any one know what the MI signifies? Thanks, Don Brown  |  IP: Logged Charles Murphy Film Handler Posts: 2 From: Exchange WV USA Registered: Jul 2011 posted 04-05-2013 06:27 PM                     1-6SN7-ST, 2-RCA 1622, 2-RCA1620.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 04-05-2013 07:56 PM                     Master Index......generally used on systems or assemblies versus a part.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-06-2013 07:55 AM                        I believe that all MI-s were made in Camden NJ on the same assembly line. Identical build-quality on cinema, P.A., and broadcast equipment; probably same people. I have been working on MI equipment since I was 12, now 64. Louis  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 04-06-2013 08:41 AM                     There are common subs for those tubes. Ask Mr. Google.  |  IP: Logged Robert Koch Film Handler Posts: 93 From: Williams Ca USA Registered: Apr 2006 posted 04-06-2013 02:46 PM                     MI in RCA parlance says Master Item.The amplifier in question is an MI9257 with a power output of 15 watts used as a amplifier in RCA PG 220 systems and as monitor/emergency amplifier in larger systems PG 240 and PG 242. PG stands for Photophone Group. The tube compliment for the MI 9257 was 5U4G rectifier,2 1622[6L6] power output;2 1620[6J7] voltage amplifiers; 1 6SN7 phase inverter.They also stuck a couple of 991 neons as voltage regulators for the 868 gas photocells. These,charitably said, did`nt do the job. Any further requests for information in the "dark ages" I will try to answer.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-06-2013 03:55 PM                        I've probably got the manuals for those. Before Dolby they were common in small town indoor theatres and as preamps in drive ins. Louis  |  IP: Logged

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