New subject: IBM 9221 mainframe at auction

17 Jan 2008

...
  From: rtellason at verizon.net

 On Wednesday 16 January 2008 08:21, Gordon JC Pearce wrote:
  On Friday 11 January 2008 15:36:05 dwight elvey
wrote:
  Although, a side subject, I like Jay, consider
tube manufacture
 relavent to some of my computing equipment.
 Dwight 
 I wonder how much computing equipment you could make from home-made
 triodes?

 Even a simple (say 4-bit) adder would be pretty impressive. 
 In power as well.

 It'd be darn-near EMP-proof, though. :-)

Hi
 I thought I might clarify what equipment I had.
First it is not digital, it is an analog computer. Each
tube calculates to about two decimal digits making
each tube worth about 20 or so TTL equivalent.
Dwight

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youtube movie of making a vacuum triode.