Sphere Research Corporation 3394 Sunnyside Rd. West Kelowna, BC, Canada V1Z 2V4 Phone: +1 (250) 769-1834 FAX:+1 (250) 769-4106 A great source for test equipment, repairs, calibrations, useful metrology information, and of course, SLIDE RULES!
Sphere's Semiconductor/Tube Databook Collection Downloads (Collected from all over the web, thank you everyone for creating these scans) Hosted at Jim Allen's siteSorted by Category Hosted at KO4BB's site (by Paul Swed)Sorted by Category
A few years ago in 1999, Hewlett Packard split into:
Hewlett Packard (computers and peripherals) and
Agilent (Test Equipment and analytical equipment)
Which then in turn then divested the RF semiconductor portion in 2005 to:
Avago. Now in 2014, Agilent is split again into Agilent (medical and scientific) and Keysight (test and measurement).
Danaher Corporation Bought Tektronix (Test Equipment Manufacturer) in 2007
And had previously bought Fluke (Test Equipment Manufacturer), which itself had previously acquired Wavetek (Test Equipment Manufacturer) which had merged with Datron (Test Equipment Manufacturer).
For added confusion,
The RF portion of Wavetek became Willtek Communications, which is now part of Aeroflex.
Prior to this, PMI/Pacific Measurements (Microwave Test Equipment) had been acquired by Wavetek, but those assets eventually wound up as part of Gigatronics (Microwave Test Equipment), who mercifully are still around.
Long time avionics icon IFR (Avionics Test Equipment) and test equipment maker Marconi (RF Test Equipment) both became part of Aeroflex (Electronic Systems and Test Equipment).
Semiconductor Company Name Changes
Having trouble figuring out who is who these days? No surprise, there have been so many buy-outs, divestitures and mergers, it's hard to know who's who in the semiconductor zoo these days. Here's a list of some commonly sought after makers.
RCA and GE
First Harris, then Intersil, except for the CMOS, which went to TI
Semiconductor makers that now appear to be totally gone from production: Philco, Delco, CBS, Sylvania, Westinghouse, Clevite, Bendix, Transitron, Tung-Sol, Hoffman Semiconductor. Please Correct me if I am wrong!