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 Post subject: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Mon 11, 2019 5:29 pm 
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Location: Southeastern Michigan USA
I recently picked up a Truetone D727 in pretty rough shape but I now have everything working but need some directions on how to set the buttons on the auto-tune feature. I can't seem to locate anything online, but I guess the Truetone is the same as the Detrola 175. Any help would be appreciated. I also see that there is a dial bulb over the auto tune selection anyone know what that is for?

Thanks, Ray


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 3:32 am 
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Location: Detroit, MI USA
The instructions are supposed to be pasted inside the cabinet on a large sheet of paper that pretty much covers one end of the cabinet. Also they appear somewhere in Rider although maybe not linked to your model number.

The light bulb is used only when setting the push buttons. If you follow the directions you connect the free lead of that bulb to the movable station selector pin associated with the button you are setting, then move the pin until the light is out when the station is tuned in dead center. In reality, it doesn't always stop where you want but very slightly to one side or the other.

Note that because of the way the selector setting light is wired, if you leave it connected for more than a few seconds at a time to one of the movable pins (or anything else), it can almost immediately cause the power transformer to burn out, a very common problem on those sets.

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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 4:11 am 
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Location: Mountains of Mourne. Ireland.
viewtopic.php?p=1615749#p1615749

Detrola 183 Electric automatic tuning system...
http://americanradiohistory.com/hd2/IDX ... e-0006.pdf


Greg.


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 4:42 am 
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Truetone D-727 instructions. Save image to your computer.

Image
Large image→ https://i.ebayimg.com/images/g/ZAcAAOSw ... -l1600.jpg

Greg.


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 2:47 pm 
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Greg

Beautiful that helps a lot. The paper directions on mine had deteriorated and fallen off. This is a pretty interesting radio, I wouldn't have expected that type of tuning back in 1937.

Thanks Again, Ray


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 4:19 pm 
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Location: Detroit, MI USA
Utah Radio Products, best known for manufacturing transformers and speakers, designed that electric tuning system which was also used in a couple of other brands not related to Detrola. Eventually Detrola ended up owning Utah Radio Products, but not until well after these sets were built.

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Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 6:33 pm 
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image origin: https://www.ebay.com/sch/i.html?_from=R ... Complete=1

Greg.


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 Post subject: Re: Truetone D727 - Detrola 175 Electric Tune
PostPosted: Mar Tue 12, 2019 9:45 pm 
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Greg

Well I didn't think they were worth that much ($500), but it is a really unique radio. I have a little cabinet work to do and waiting on a magic eye tube and I can put mine back together and she can be a Shelf Queen in my shack. Thanks for the link, here is a link to one that just went up on Ebay and is already at $122.50.

https://www.ebay.com/itm/TRUETONE-model ... 3092150437

Ray


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