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 Post subject: WTB - 1920's RF Coils - UPDATED
PostPosted: Jul Wed 04, 2018 11:57 pm 
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Location: Plymouth, MI
I am looking for plug-in coils for a 1922 Deforest Interpanel MR6. To cover the AM band I need the following amount/windings :

1- 100 Turns
1 - 25 Turns

They look like this......

Attachment:
MR6 Coil 1e.jpg
MR6 Coil 1e.jpg [ 227.56 KiB | Viewed 345 times ]


[attachment=0]MR6 Coil 2e.jpg[/attachmen


Attachments:
MR6 Coil 2e.jpg
MR6 Coil 2e.jpg [ 22.51 KiB | Viewed 345 times ]

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Dan

I know just enough to be dangerous.....
(Member - Michigan Antique Radio Club)


Last edited by atwaterkent1 on Jul Thu 12, 2018 11:33 am, edited 3 times in total.
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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 5:40 am 
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Joined: Mar Fri 28, 2008 2:49 pm
Posts: 1306
Location: Phoenix, AZ 85085
In no scenario will you need three of the same L-150 coils nor will you likely ever need a L-250 which covers 1300-4000 meters for broadcast use.

The following coils will get you the entire broadcast band for either the single primary circuit or for the balanced primary circuit. 2- L-150's, 1- L-100, 1- L-75, 2- L-50's, 1- L-35, 1- L-25
Alan


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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 6:14 am 
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Corrected 7/5/15.



Attachment:
Coil List - Deforest MR6 e.jpg
Coil List - Deforest MR6 e.jpg [ 171.38 KiB | Viewed 301 times ]



305-710 and 150 - 355 meters covers the AM band and as you read across you can see that 2- 100's and 1- 50 cover the first range and 2 - 50's and 1-25 covers the 2nd range.
Attachment:
Coil List - Deforest MR6 e.jpg
Coil List - Deforest MR6 e.jpg [ 171.38 KiB | Viewed 301 times ]

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Dan

I know just enough to be dangerous.....
(Member - Michigan Antique Radio Club)


Last edited by atwaterkent1 on Jul Thu 05, 2018 9:14 pm, edited 1 time in total.

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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 2:13 pm 
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Joined: Mar Fri 28, 2008 2:49 pm
Posts: 1306
Location: Phoenix, AZ 85085
atwaterkent1 wrote:
According to the instructions the coils I asked for will do what I want done. Read for yourself.

460 - 1050 and 835 - 1950 meters covers the AM band and as you read across you can see that 2- 150's and 1- 100 cover the first range and 2 - 250's and 1-150 covers the 2nd range.


My mistake. I didn't realize the AM band was different in the northern US. Here in the southwest the AM band runs from 525 to 1705 kHz or 571 to 176 Meters.
Alan

Attachment:
Deforest catalog bal-2 arf.jpg
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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 9:15 pm 
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My apologies Alan :oops: , the commercial range is no longer commercial. Corrections made. I don't know why the radio calls for different coils unless the circuit is set up differently.

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Dan

I know just enough to be dangerous.....
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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 10:31 pm 
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Joined: Aug Mon 08, 2011 4:19 am
Posts: 300
Location: Indianapolis, Indiana, USA
Dan, I found this coil among the vast hoard of parts I acquired. See my post in June 2018 found. The person who had these items mounted many of the parts on cardboard with a description of the item. It was as if they were educational radio props. This item was interesting.

See attached photos,

Joe
Indiana Historical Radio Society


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DeForest Radio coil and info page.jpg
DeForest Radio coil and info page.jpg [ 166.78 KiB | Viewed 233 times ]
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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Thu 05, 2018 10:32 pm 
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Location: Indianapolis, Indiana, USA
additional photo


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DeForest Radio coil close up.jpg
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 Post subject: Re: WTB - 1920's RF Coils
PostPosted: Jul Fri 06, 2018 12:22 am 
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Sure looks like right type, but L-400 not listed as a coil used on this radio. I just got into this radio and it's my first with coils, so I don't know if you can use coils other than what's listed. I also am not sure if the diameter matters.

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Dan

I know just enough to be dangerous.....
(Member - Michigan Antique Radio Club)


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 Post subject: Re: WTB - 1920's RF Coils - UPDATED
PostPosted: Jul Thu 12, 2018 11:34 am 
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Location: Plymouth, MI
Bump

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Dan

I know just enough to be dangerous.....
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