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Thread: TrueTone D1143 Radio to Amp

  1. #1
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    TrueTone D1143 Radio to Amp

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    I acquired this old radio made in 1941 or 42. It's a tube radio and I'm wanting to convert it to a guitar amp. Since it has 2-6K6 tubes, which are very close to a 6V6, and the rectifier tube is a 5Y3, it seems very plausible for a Fender Champ style amp.
    I can't seem to locate a preamp section in the schematics for the radio. I do not want to purchase another power transformer to power a 12ax7 circuit. I already have the 12ax7 tube and tube socket.
    Also the speaker seems to be powered. So instead of the preamp, could I use the speaker?
    Any help or ideas would be much appreciated.
    As for the power cord, I have a borked computer monitor that I'm planning on repurposing the AC cord an the power jack and putting a fuse in there too.
    truetoned1143.pdf20180920_093207-jpg20180919_153215-jpg20180919_153111-jpg
    Wow, now I feel really stupid. Thanks.

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    If you're not already familiar with field coil speakers I'd start by researching them.

    Field coil loudspeaker - Wikipedia

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    Hey,
    The speaker isn't 'powered' as such. It requires power.
    Actually, a lot like a capacitor microphone does.

    Instead of having a permanent magnet, those old boys used an electro-magnet instead.

    I don't know much about them but removal/replacement may not be as simple as removing power and hooking up a regular modern speaker.
    I know you didn't suggest that; Just throwing it out there.

    I don't think you should need any external or additional preamp.
    Just find the right point between tuner and amplifier and tap in there. Depending how it's setup, there may be a volume or tone control at that point?

    Anyway, I'll get out of the road and let someone who knows tell you more. :P

    Any pics of the guts?
    ---------- Steenaudio Website ----------

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    I'd like to at least delete the radio circuits maybe cut down on some noise.

    And I did not even try to plug it in, the condition of the power cord is dangerous looking. So that'll be my 1st order of business. There's also some broken cord in a couple places. 1 is one of the yellow cables to the speaker coming off of one of the 6K6 tubes.


    20180921_162159-jpg20180921_162142-jpg20180921_162139-jpg20180921_162128-jpg20180921_162213-jpg
    Wow, now I feel really stupid. Thanks.

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    Quote Originally Posted by bouldersoundguy View Post
    If you're not already familiar with field coil speakers I'd start by researching them.

    Field coil loudspeaker - Wikipedia
    Thanks, I was considering getting a replacement speaker.
    Wow, now I feel really stupid. Thanks.

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    Quote Originally Posted by Steenamaroo View Post
    Hey,
    The speaker isn't 'powered' as such. It requires power.
    Actually, a lot like a capacitor microphone does.

    Instead of having a permanent magnet, those old boys used an electro-magnet instead.

    I don't know much about them but removal/replacement may not be as simple as removing power and hooking up a regular modern speaker.
    I know you didn't suggest that; Just throwing it out there.

    I don't think you should need any external or additional preamp.
    Just find the right point between tuner and amplifier and tap in there. Depending how it's setup, there may be a volume or tone control at that point?

    Anyway, I'll get out of the road and let someone who knows tell you more. :P

    Any pics of the guts?
    Pic's posted.

    If I can I'll use the old speaker, looks in decent condition, but I'll have to do some testing. Maybe it'll sound spectacular.
    Wow, now I feel really stupid. Thanks.

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    Quote Originally Posted by fuzzsniffvoyage View Post
    Thanks, I was considering getting a replacement speaker.
    I'm no expert, but I think it may act as part of the power supply. Using a permanent magnet speaker might mean reconfiguring the power supply.

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    Quote Originally Posted by bouldersoundguy View Post
    I'm no expert, but I think it may act as part of the power supply. Using a permanent magnet speaker might mean reconfiguring the power supply.
    I don't want to do that. I'm trying to do this on the cheap but still sound decent or unique.

    The worst I can do is blow the thing up. (I'll keep fingers and toes out of the circuit)
    Wow, now I feel really stupid. Thanks.

  9. #9
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    Oh, I missed the pdf in the first post.

    The phono jack is something of a hint.... :P
    With the input switch in that position, the radio section would effectively disconnected from the circuit.
    ---------- Steenaudio Website ----------

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    Quote Originally Posted by bouldersoundguy View Post
    I'm no expert, but I think it may act as part of the power supply. Using a permanent magnet speaker might mean reconfiguring the power supply.
    Yep, power supply filter choke coil.
    Mark.......

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