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Thread: 1938 DIY radio

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    1938 DIY radio


    Old Guy's Avatar
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    Your neighbors called. They like your music.

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    Senior Hostboard Member Art J.'s Avatar
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    Re: 1938 DIY radio

    I can verify that barrel speakers make a nice novel addition to a game (bar) room.
    Mine were made 30 years later. Can you identify them from the picture ??
    They are an old classic..........

    PC311914 on Flickr - Photo Sharing!






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    Senior Hostboard Member Panomaniac's Avatar
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    Re: 1938 DIY radio

    Empire?

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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: 1938 DIY radio

    Quote Originally Posted by Panomaniac View Post
    Empire?
    Grenadier 800's i believe.

    More on topic, our local TV tech(in business since the 40's) demo'd a customer's vintage battery set for me a while back, i have to admit that it sounded amazingly good, possibly the best i've ever heard AM sound.

    Also, per the article, PM loudspeakers in 1938? I found this very interesting/surprising. Would PM's have had a premium cost associated with them at that period in time?
    Not all vegetables make good leaders.

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    Senior Hostboard Member Panomaniac's Avatar
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    Re: 1938 DIY radio

    I was surprised at that, too. And can't quite figure out how the speaker is driven off that 33 pentode. It seems to be directly coupled of the output tube.

    Wacky stuff!

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    Senior Hostboard Member Steve Schell's Avatar
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    Re: 1938 DIY radio

    My guess is that the connection labeled "SP." is actually to the primary of the output transformer. In the old radios this transformer was often mounted on the loudspeaker.

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    Senior Hostboard Member Panomaniac's Avatar
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    Re: 1938 DIY radio

    :doh: I should have remembered that! As many of those old radios as I've been in.
    Thanks Steve.

    On second glance --- I don't see an output transfo, do you?

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    Senior Hostboard Member Steve Schell's Avatar
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    Re: 1938 DIY radio

    Hard to tell from the photo, but I think the transformer may be on the underside of the speaker motor, where the wires are headed. In this catalog page it can be seen how the transformers were often attached to radio speakers:

    http://www.lansingheritage.org/image...at-Lansing.jpg

    BTW, the Lansing 15X shown is the grandaddy of the Altec 15" cast frame drivers. I believe Lansing was building these prior to his involvement in the MGM Shearer Horn project, and may have been a factor in his being chosen for the design team.

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