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Old 18th May 2008, 06:45 AM   #1
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Join Date: Dec 2003
Location: Eastern Missouri
Default MIC input transformers.....

Ive been working on a Knight 3050 pa/mixer, that I have successfully seperated the amp from the preamp. Now I need some more help....surprise surprise...huh?

All of the mic inputs have "sockets" that are apparently for specific mic transformers or even just "bypass" modules for line level inputs, as seen here(the upper left hand corner......four empty sockets....

Click the image to open in full size.

Most of the mic trans I have seen are the altec style with eight pins, mine however, have only seven pin sockets......troublesome to say the least.

I would like to use just one of the inputs for a mic, the others for a 78 rpm "vintage" turntable, as well as a mm or mc turntable.......just for fun.......all in mono......yeah...i know im crazy, but for those who havent done mono.....it really can be amazing......(and cheap.......lol).

Any help or direction for my odd trans quest would be greatly appreciated......I wouldnt even be opposed to winding my own.......


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Old 18th May 2008, 06:48 AM   #2
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Change the socket?
Use a small square Lundahl under the chassis?
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Old 18th May 2008, 06:58 AM   #3
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Location: Eastern Missouri
Default Thank ya!

I guess I'll have to look into that........never really considered it....... I really know NOTHING about these input trans, other than their theoretical capabilities.....I assume they are just smaller passiver versions of tube output trans....... please correct me if im wrong......

maybe make up and adaptor.......i like to leave things as stock as possible.......(ironic huh......i just majorly modded the poor thing, but minus a few holes, it could be put back to stock.........
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Old 18th May 2008, 07:06 AM   #4
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Measure the existing socket, and an octal may fit with no other mods. If not, add something else under the chassis.

All audio Tx's are similar in theory, just many mic Tx's have lower turns ratios than many OPT's and are a lot smaller and don't generally tolerate DC.

K&K Audio in the US are the supplier for Lundahl. Kevin is knowledgable guy.
Also look into Jensen transformers (lots of tech info here too) and Cinemag

If you don't already have the input Tx, I'd buy something new rather than relying on questionable vintage stuff.
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Old 18th May 2008, 07:13 AM   #5
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right on.....will investigate later.too late for "real" critical thinking.....lol...thanks for the info........
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Old 18th May 2008, 08:24 AM   #6
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Hmmm, they are octal too.

I have said vintage mic transformers, but all are either 9 or 11 pin

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