Maybe changes were made along the way or maybe not. So McIntosh starts making them and when they a quantity (100-200-300?) they start sending them to Western Electric in Syracuse to make sure everything is correct. They at least specified the input/output requirements and rack mount size that they needed. They contract McIntosh to make them, either to their own Western Electric design or a McIntosh design (they are similar to the McIntosh MI 10 of that era). Western Electric needed a large quantity of amps (a couple thousand?). McIntosh is about 70 miles south of Syracuse in Binghamton NY. There used to be a huge Western Electric manufacturing and warehouse facility on Thompson Rd. My amps came from a large central office in downtown Syracuse NY. This is my theory on why mine is labeled differently, and have talked to some McIntosh gurus and they think it sounds plausible. Printed on the front it says for “Serial Number 301 and UP”.
I though it odd but I did not really give it more though until I got a reprinted copy of the original McIntosh “instruction manual” from Audio Classics. I have been told that some of the early McIntosh amps started their labeling at 101 instead of 01 but I can find no one at McIntosh that can confirm this is the case with mine.
On mine the serial number is left out of the standard product info label and is instead printed off to left side of it. They were all in serial number 800 and up range. and 2 in Asia) that sold over the last few years and I noticed on all of them the serial numbers were included in “product info label” printed by McIntosh on the amps. I have found 4 different sets of these (2 in the U.S. That’s why all the input and output wiring is internal within the amps case, no wiring is sticking out that could be snagged. They were rack mounted in large “relay racks”. The gentleman I bought them from confirmed this. These (and later versions) were used to power intercom systems in Bell System central offices. There is a description on Roger Russell’s McIntosh history web site under, KS 16575-L1 (A-125) These amps these were made for one year in 1957-58. He got this pair in the early 1970’s as they were being taken out of service and being scraped! He put them in a box and they sat in his attic till this earlier this year.įirst off, a little history about these amps. I bought these from a retired New York Telephone central office technician of 39 years. ** UPDATE SOLD ** For Sale - Western Electric KS-16575 (made by McIntosh) Mono Tube Amps - serial numbers 107-108
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