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Altec-Lansing 1781AT transformer 1785 mfr?
Altec-Lansing 1781AT transformer 1785 mfr?
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Old 7th February 2019, 11:31 PM   #1
multi-volti is offline multi-volti  United States
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Default Altec-Lansing 1781AT transformer 1785 mfr?


I have some early 1990's Altec-Lansing 1781AT mic preamp modules. They have the 1785 optional 600:10000 ohm input transformer.

I am curious if I can figure out whose transformers they are.

They have markings

My first guess would be EIA code = 671 & date code = 9228 but I cannot find an EIA Mfr. code of 671.

651 was apparently Midcom in the mid-90's. Their name turns up now associated with Wurth. I vaguely recall Midcom making telecom transformers long ago...not as exciting as finding Jensen, etc.

But I suppose they do what they do just fine...and they are already here. I can't change anything, but am curious whether they are diamonds or dogs.

They are in formed metal boxes, but the bottoms are open (wax-potted), and an open can doesn't seem like profound shielding.

Sound familiar to anyone?


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