IBM TH-537  
Written by Accutron on 2007-03-08  

IBM's early computers and electronic accounting machines used large arrays of 'finger' modules, most of which have one tube and some amount of passive support circuitry. This is an extremely rare TH-537 two-tube module from an IBM 604 Electronic Calculating Punch or similar. The module has two examples of the IBM/Tung-Sol 5696, a xenon-filled thyratron tetrode used as a high speed switch in early IBM computers.

IBM TH-537 finger module.

This article is part of the [Logic & Memory Circuits] exhibit.

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