RCA 6499  
Written by Accutron on 2009-04-04  

The RCA 6499 Radechon is barrier-grid charge storage tube, first produced by RCA in 1956, and used in such venerable systems as the SAGE defense computer. The 6499 uses an electron beam to store data on a charged target. Much like modern DRAM, the contents of memory must be continually refreshed in order to be maintained. The 6499 has a maximum storage capacity of 16,000 random-access bits, though its practical capacity is somewhat less, due to splatter on adjacent bits from the electron beam.

RCA 6499 Datasheet (PDF)


RCA 6499 Radechon tube.


6499 Radechon, view of barrier grid.

This article is part of the [Detection & Imaging Tubes] exhibit.

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