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Various electronics projects -- very professionally done. The stuff about the SI570 DDS is particularly interesting, since I haven't seen it mentioned elsewhere and it's much easier to deal with than most DDS chips.
to dds electronics ham oscillator radio retrotech vco ... on 05 August 2007
The Old Calculators Web Museum edit / delete
Includes lots of detail about how early EM and electronic calculators worked -- for example, the algorithms they used to do intrinsic functions efficiently. Might be worth looking at for small maths libraries.
to maths mechanica retrocomputing retrotech ... on 01 August 2007
John Honniball's Home Page edit / delete
Some fun retrocomputing/retrotech stuff.
to retrocomputing retrotech ... on 21 July 2007
DIY Loudspeaker Projects edit / delete
A very large collection of articles on DIY loudspeaker design and construction, with many different drivers and cabinet designs represented, and lots of interesting (largely audiophile-free) discussion of how to evaluate them. The vintage speaker/driver/crossover upgrades are particularly interesting.
to audio electronics loudspeakers retrotech speakers woodwork ... on 21 May 2007
WW II Codes and Ciphers edit / delete
Lots of detail about and period documents from Bletchley Park.
to cryptography retrotech ... on 29 April 2007
A-100 Service Manual edit / delete
Just what you need if, say, you want to build a Hammond organ in software...
to hammond music organ research retrotech ... on 07 April 2007
VMARS R1155 File index edit / delete
The manual.
The RAF radio receiver my grandfather has (apparently in working order), along with the matching transmitter.
Jerry Proc's Family of Web Pages edit / delete
Some interesting historical stuff about LORAN and other navigation systems, and random boatanchor radio information and stories.
to history navigation radio retrotech ... on 23 March 2007
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tasty by Adam Sampson.