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IMS 2009 RF/Microwave Museum Photos

IMS 2009 Historical Booth - RF Cafe

IMS 2009 Microwave Industry Historical Booth

A pleasant surprise at the International Microwave Symposium (IMS) 2009 (also see IMS2011) show in Boston was the "Historical Booth." It had a very nice display of items from the early days of radio and radar. According to the IMS 2009 website, the items are "memorabilia from the first IMS held in Boston 50 years ago." Most displays were glass cases, so it made getting useful photographs difficult because of glare and reflections. You will see some of that in the images here. More information can be found on the National Electronics Museum website. Barney Fife, seen in the first photo, was dutifully guarding the displays. After seeing what was included, I was glad that the show organizers decided to place him there.

In retrospect, I should have taken many more photographs of the displays and suffered through attempting to remove the glare and reflections, because a lot (maybe all) of this stuff cannot be found documented anywhere on the Internet. One item in particular I wish I had photographed was what appeared to be a specially formed section of waveguide (maybe C-Band based on size) that had been routed out of a block of wood, and then the cavity was lined with copper foil.

We've come a long way, baby!

In order to keep page loading time reasonable, I have reduced most of the images to fit on half the page. Clicking on an image will display the full-size version. Some image files are very large, but I wanted to try to retain enough resolution to be able to read the text in the images. Please contact me if you would like to use any of the images in your publication. If you use them without permission, please at least credit RFCafe.com.

Please take a few more minutes to read my report on the rest of the IMS 2009 show, "RF Cafe Goes to Beantown."

RF Cafe - IMS 2009 Historical Booth - Acorn Tubes, Low Noise Tubes, Orbital Beam Amplifier, Triode, Pulse Oscillator

Vacuum Tube Display

  • Acorn Tubes
    • RCA 954 Pentode Amplifier
    • RCA 955 Triode Amplifier
    • RCA 957 Triode / VT237
    • RCA 958 Power Triode
  •  Low Noise Amplifier Tubes
    • Western Electric WE 386A Pentode
    • Tung-Sol WE 717A "Mushroom" Pentode
    • Western Electric 6AK5 Pentode
  • RCA 1630 Orbital Beam Amplifier
    • Originally RCA A-5588A (aka VT-128), used in SCR-270 radar like at Pearl Harbor
  • Western Electric 316A Triode
  • Western Electric WE388A Triode
    • "Doorknob Tube" used in AN/APT-2 "Carpet" radar jammer
  • RF Cafe - IMS 2009 Historical Booth - UHF Tubes from WWII - Most Good up to 500 MHz

    UHF Tubes from WWII Most Good up to 500 MHz

    EIMAC 15E Pulse Oscillator
  • RCA 832A Twin Triode (aka VT-286)
  • RCA 8012 UHF Triode
    • Used in AN/APQ-9 "Carpet III" radar jammer
  • General Electric GL-3C22 Lighthouse Tube
  • General Electric 2C40 Lighthouse Tube
  • General Electric 2C39 Power Lighthouse Tube
  • Bell Labs 416A Planar Triode
  • Western Electric 416B Triode
  • Western Electric 416C Triode
  • Sylvania Rocket Tube
  • RCA 6161 Power Triode
  • General Electric Planar Triodes
    • GL-6299
    • GL-7391
    • Z-2886
  • RCA Pencil Tubes
    • 5876 Pencil Triode Amplifier
    • 5893 Pencil Triode Amplifier
  • RF Cafe - IMS 2009 Historical Booth - 5J29 Continuous Wave (CW) Magnetron

    5J29 Continuous Wave (CW) Magnetron (used in aircraft jammer transmitters)

    15E/4C30 Transmitting Triode
  • 1630 Orbital Beam Hexode
  • 954 Acorn Tube Pentode
  • 955 Acorn Tube Triode
  • GL-316A/VT-191 Transmitting Triode
  • Used in the SCR-270 radar
  • Microwave magazine, July-August 1959(?)
  • QST (1959?)
  • RCA Laboratories report
  • RCA "Practical Analysis of Ultra High Frequency"
  • "The Invention of the Travelling Wave Tube"
  • IEEE "Microwave Theory and Techniques"
  • Western Electric 725 X-Band Magnetron
  • Western Electric 720BY Magnetron
    • Peak Power = 1 MW @ 2.8 GHz

Large display of patents, photos, manuals, and an example of the VT-158 tube.

  • -IMS 2009 Historical Booth, Westinghouse WL-530, Water Cooled High Power Triode - RF Cafe

    Westinghouse WL-530 Water Cooled High Power Triode

    RF Cafe - IMS 2009 Historical Booth - Literature Display

    Literature Display

    RF Cafe - IMS 2009 Historical Booth - Magnetron Tubes

    Magnetron Tubes

    RF Cafe - IMS 2009 Historical Booth - Dr. Harold A. Zahl

    Dr. Harold A. Zahl The VT-158 Tube and the TPS-3 Radar

    Developed at Camp Evans by Dr. Harold A. Zahl for the TPS-3 radar

RF Cafe - IMS 2009 Historical Booth - VT-158  600 MHz - WWII Radar Transmitting Tube

VT-158  600 MHz WWII Radar Transmitting Tube

RF Cafe - IMS 2009 Historical Booth - Radarange Mark VI - (Amana is a division of Raytheon)

RF Cafe - IMS 2009 Historical Booth - Radarange Mark VI - (Amana is a division of Raytheon)

Radarange Mark VI (Amana is a division of Raytheon) The klystron is sitting to the left of the oven.

RF Cafe - IMS 2009 Historical Booth - Tube & Waveguide Display

Unfortunately, I do not have any information on this display of tubes and waveguide.



Posted August 5, 2020
(updated from original post on 6/20/2009)

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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