RADIO TUBE OF METAL CAN BE WALKED ON (Nov, 1933)

Finally, I can realize my dream of making a floor out of radio tubes!

RADIO TUBE OF METAL CAN BE WALKED ON

Proof against the roughest handling, an indestructible type of radio tube developed in England is so sturdy that it may even be stepped on without damage, as shown above. A metal bulb replaces the customary one of glass, maintaining the vacuum and also serving as the anode; glass is used in the tube only to insulate the bulb horn the metal base, The tube is encircled by a metal cylinder for electrical shielding. It is designed for use anywhere but should prove especially valuable in portable sets or others frequently moved.

7 comments
  1. Matt says: February 13, 20083:18 am

    Metal tubes are practical and great for RF service; but without that comforting glow they’re about as fun to look at as a transistor.

  2. Alan J. Richer says: February 13, 20089:57 am

    Ah, yes…when men were men and tubes were metal!

    I must say that developing circuitry with metal-cased tubes was very nice – shielding was built-in to the device, so all you needed to pay attention to was the lead routing under the chassis and your design was very likely to work.

    They were also really good for mobile work – wouldn’t often break or go bad under vibration the way glass tubes would.

    Alan

  3. Alan J. Richer says: February 13, 20089:59 am

    Oh – forgot one thing! You can still keep your coffee pot warm over metal tubes as easily as glass ones…a thermionic diode is a thermionic diode…they all get warm and cozy (and I have the burns to prove it! :) )

  4. albear says: February 13, 200812:12 pm

    Wow! vacuum tubes of the future

  5. Adrian says: February 14, 20081:33 am

    How dangerous is that?
    Makes me wince at the thought of falling base over apex.

  6. Marty Harris says: February 26, 200911:52 am

    I guess these are really great for Antique Automobile Radio but in my Restored Table and Console sets you can’t beat the old original glass tube. It’s still true “Real Radios Glow in the Dark.”

  7. Harry says: February 26, 200912:24 pm

    ¡Viva Flamenco!

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