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Capacitor replacement

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  • ChrisJ
    ChrisJ Member Posts: 17,597

    If memory serves the beam power tetrode came out to get around a patent for the pentode.

    My memory is wrong sometimes though.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    PC7060
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 20,760

    Used to have one of those GE "Super Radios" DC batteries (I think it took like 8 of them) or 120 volt. That could pull in a lot of stations in the old days.

    Now it seems like you can't pull in as many stations no matter which radio you use.

  • ChrisJ
    ChrisJ Member Posts: 17,597

    Best I ever had was an early 60s Fisher FM-200 with external MPX-60 decoder with a roof yagi on a rotor.

    I was able to get perfect stereo from 150 miles away. Along with 102.7, 102.9, 103.5 103.9 104.1 and 104.3.

    102.9, 103.9 and 104.1 were unheard of by me.

    I'm sure a Fisher FM1000 would have done better but I couldn't afford that.

    My furthest for AM was really far. I don't remember how far but it was using a mid 50s Fisher AM/FM tuner.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • 109A_5
    109A_5 Member Posts: 4,322
    edited August 4

    This is the way I remember it.

    image.png image.png image.png image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • 109A_5
    109A_5 Member Posts: 4,322
    edited August 4

    How about the difference between superheterodyne and just heterodyne receivers.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Jamie Hall
    Jamie Hall Member Posts: 27,662

    I wonder what's become of them… somewhere around here I have WWII era portable AM-FM radio. Think Walkman, but dating from about 1940. Tubes, of course — and batteries, including a B for the plate voltage. Also, when I was a young brat, a beautiful Hallicrafters AM/shortwave (I never learned Morse code, so being a "ham" was out!, but I could listen!). Shortwave from all over the world.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • ChrisJ
    ChrisJ Member Posts: 17,597
    1000027904.png

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    PC7060
  • 109A_5
    109A_5 Member Posts: 4,322

    Apparently the technical documentation I read back in the day, just described how it worked, not the desire to avoid patent issues.

    Which method works better ?

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • mattmia2
    mattmia2 Member Posts: 17,821
    https://forum.heatinghelp.com/discussion/comment/1901347#Comment_1901347

    1940 fm? there wasn't much to listen to then.

  • ChrisJ
    ChrisJ Member Posts: 17,597
    https://forum.heatinghelp.com/discussion/comment/1901352#Comment_1901352

    No idea.

    I suspect both work fine.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

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