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Old 02-11-2010, 12:39 PM
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Whatizit ?

Found this in the basement boneyard of local NBC affiliate. Should have asked the engineer what it was.

Called a MONITRAN TM-30A RCA # MI-26499

Has crystals on turret type channel selector but front controls suggest it might be a modulator ?
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File Type: jpg RCA MONITRAN 002.jpg (60.3 KB, 35 views)
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Old 02-11-2010, 04:03 PM
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I dunno what it iz, either, but me likey the Box its takin' up residence in....
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Old 02-13-2010, 01:35 AM
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Quote:
Originally Posted by Sandy G View Post
I dunno what it iz, either, but me likey the Box its takin' up residence in....
Notice I also have another of those RCA rack enclosures below it -- removed the Deco red & chrome strips off them to decorate my audio rack (picture)
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Old 02-13-2010, 03:56 AM
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Very cool. I've been lookin' for a rack to house my BT modulators.
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Old 02-13-2010, 06:50 AM
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Those "Boxes" are in high demand by the Boatanchor Boys....They can go for silly big money on You-Know-Where. Especially ones like that, w/an opening lid...You can crack it open for ventilation, or leave it open, which makes it look like you're "working" on yr R-390A or SP-600, & know what you're actually doing...GREAT for poseurs like me...
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Old 02-13-2010, 11:38 PM
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Quote:
Originally Posted by NewVista View Post
Found this in the basement boneyard of local NBC affiliate. Should have asked the engineer what it was.

Called a MONITRAN TM-30A RCA # MI-26499

Has crystals on turret type channel selector but front controls suggest it might be a modulator ?
If I had to guess from the name, its a modulator ("TRANsmitter") meant as an accessory to a MONoscope indian-head pattern generator. However, I never saw one of these before.

Edit: Or meant as a TRANsmitter to allow use of TVs as MONItors. A MONItor TRANsmitter.

Last edited by old_tv_nut; 02-13-2010 at 11:41 PM.
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Old 02-13-2010, 11:42 PM
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Can't read the labels on the knobs - that would help!
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Old 02-14-2010, 11:26 AM
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Originally Posted by old_tv_nut View Post
Can't read the labels on the knobs - that would help!
They say Video Level, Audio Level , Channel Selector (2-13), RF Output, Audio 600 ohm/ HiZ, Audio 400~/Ext, Carrier On/Off.
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Old 02-14-2010, 12:51 PM
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Quote:
Originally Posted by NewVista View Post
They say Video Level, Audio Level , Channel Selector (2-13), RF Output, Audio 600 ohm/ HiZ, Audio 400~/Ext, Carrier On/Off.
Sure sounds like my second guess
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Old 02-15-2010, 01:45 AM
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Originally Posted by old_tv_nut View Post
Sure sounds like my second guess
Yes it sure does - an unusual name but it must mean MONItor TRANsmitter like you said. Will have to get it running - uses PL coax connectors at back.
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Old 02-15-2010, 08:41 AM
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RCA used the MI prefix for a lot of commercial items, for example sound equipment like the crossover networks used in the public address system for the 1964-65 New York World's Fair. I would like to know what MI stands for. The prefixes of their other products were usually decipherable, like "CTC" - "Color Television Chassis."

Edit - Could it be "Military-Industrial?"
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Old 02-15-2010, 10:55 PM
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After some searching, found this page indicating that "MI" stood for "Master Item" number.
http://uv201.com/Microphone_Pages/rca_junior.htm

Edit:

Here's an RCA spec sheet that spells out the term:
http://www.oswaldsmillaudio.com/imag...07/MI12484.pdf

2nd edit: and an RCA broadcast equipment catalog in which everything is listed by MI number:
http://www.davidgleason.com/Archive%...log%201962.pdf

Last edited by old_tv_nut; 02-15-2010 at 11:03 PM.
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Old 02-17-2010, 12:19 AM
Geoff Bourquin Geoff Bourquin is offline
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I had one of those...

...about 30 years ago. There should be a little RCA emblem above the pilot lamp. I still have the emblem mine came with. I honestly don't remember what happened to the machine. I probably traded it to someone for some other super-cool toy. I used to do that a lot. Occasionally I think about it and wish I had it back.

It is a modulator, and if I remember correctly it did B&W only, no color

It was crystal controlled for each channel. PL259s for everything on the back. I can't say it was the exact same model as that one, but it sure looked a lot like it. I may have a snapshot of mine somewhere. I guess I'll need to dig for it.

Last edited by Geoff Bourquin; 02-17-2010 at 12:42 AM.
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Old 02-17-2010, 11:51 AM
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Quote:
Originally Posted by Geoff Bourquin View Post
. There should be a little RCA emblem above the pilot lamp. .... it did B&W only, no color

Yes , I took the emblem off mine and added it to my 1940 RCA tube amplifiers (foto) along with the Deco chrome red pinstripe trims.

I sold the amplifiers with these RCA badges still on (mistake) but still have the decorative strips on my audio rack (previous post foto).

I would be interested in buying that emblem to restore this piece if you have no further use for it.

I'll have to re-cap this unit and fire it up and see if I can get it to pass color ?
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