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IBM Mainframe Tube Modules

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  IBM Mainframe Tube Modules by Bill Degnan - 12/24/2013 17:32
Photo of the 4 tube units with tubes installed. From left to right: (?? no markings) / IN-306 / AM-308 / AM-3(?)23. Note that the unit with no markings has a cap kludged to the side. Click for larger view


Photo of the 10 tube units with NO tubes installed. From left to right: AM-320 / IN-501 / (no marking) / AM-3(?)23 / IN-501 / TR-307 / CF-311 / AM-306 / AM-312 / IN-307. Click for larger view


The subject of this thread will be the
Ebay auction for the "Mark 1" tubes from 1951....
http://www.ebay.com/itm/...BE-MODULE-/131073757653
... After doing research I decided they are from an early IBM Mainframe such as the 650 (1951-1955) but not Mark 1. It is possible that they could be from an earlier machine. If you're interested I found these pages that go into similar units owned by others.

http://web.archive.org/w...t/mmetzler/treasure.txt
and
http://www.piercefuller....ollect/ibmpu/index.html

Interesting. Anyway I won the auction, If anyone is interested in trading similar tube boards from other machines let me know.

More to come...

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