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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Mon 10, 2022 12:44 am 
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The belted tuners are in the same position relative to each other. I don't know if that's correct, but it seems reasonable based on other radios I've worked on.

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Wed 12, 2022 9:27 pm 
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jrehkopf wrote:
Thanks. It looks like the tuning condenser is mechanically OK.

Your 2.4 ohm measurement across the tuning condenser seems to be a coil measurement, which means that your schematic is not correct in that area.

What else it means, I don’t know. :shock:

Possibly your belted tuners are out of sync?


Checking directly between the fixed and moveable plates on the tuning condenser shows 2.4 ohms. The schematic is correct as to the radios current wiring, although that doesn't mean the current wiring is correct to the original wiring.

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Thu 13, 2022 6:26 pm 
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What I am saying is that your diagram shows the right side of the circuit from the variable condenser ends at 2 capacitors (green). There is no pathway back to the other side of the variable condenser. As drawn the meter should show OL.
Attachment:
Untitled6.jpeg
Untitled6.jpeg [ 223.31 KiB | Viewed 159 times ]

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Fri 14, 2022 4:44 am 
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I'll check it out in a day or two Jeff, currently fighting a sinus infection and its been a rough couple of days.

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Fri 14, 2022 11:46 pm 
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James: Rudy, where you been?
Rudy: Got put in the hospital with seenus problems.
James: Don’t you mean sinus problems?
Rudy: No, Ize with another man’s wife and he seen us…

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Sat 15, 2022 12:26 am 
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:lol:

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Sat 15, 2022 1:48 am 
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Attachment:
Second Inductive Tuner.JPG
Second Inductive Tuner.JPG [ 761.76 KiB | Viewed 127 times ]


Attachment:
First Inductive Tuner and Condenser - (Right side of schematic).JPG
First Inductive Tuner and Condenser - (Right side of schematic).JPG [ 818.63 KiB | Viewed 127 times ]


Attachment:
Second Inductive Tuner -  (Left half schematic - right side).JPG
Second Inductive Tuner - (Left half schematic - right side).JPG [ 720.76 KiB | Viewed 127 times ]


Attachment:
Second Inductive Tuner and Condenser - (Left half of schematic - right side).JPG
Second Inductive Tuner and Condenser - (Left half of schematic - right side).JPG [ 718.01 KiB | Viewed 127 times ]


Attachment:
Second Inductive Tuner and Variable Cap.JPG
Second Inductive Tuner and Variable Cap.JPG [ 733.78 KiB | Viewed 127 times ]


Attachment:
Second Inductive Tuner.JPG
Second Inductive Tuner.JPG [ 761.76 KiB | Viewed 127 times ]


The condenser next to the first inductive tuner has two leads and both go to the same point on the condenser. How does that work?
The condenser next to the second inductive tuner has only one lead on it currently. ?

I have to lie down, my head is beating like jungle drums. I told my wife she could shoot me and call it a mercy killing.

Edit -Old schematic revision deleted.

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Last edited by atwaterkent1 on Jan Sun 16, 2022 10:24 pm, edited 2 times in total.

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Sat 15, 2022 6:40 am 
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put a beach blanket over it, and call it a day.

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Sat 15, 2022 4:36 pm 
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Location: Keystone Heights, FL, USA 32656
The center bolt would be the second connection for the round condenser (?).
Attachment:
connections.jpg
connections.jpg [ 43.74 KiB | Viewed 113 times ]

Does this tuner have 4 connections?
Attachment:
Untitled01.jpeg
Untitled01.jpeg [ 204.75 KiB | Viewed 113 times ]

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Sun 16, 2022 10:15 pm 
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Yes, it does.

Attachment:
Tuning Connections.jpg
Tuning Connections.jpg [ 1.83 MiB | Viewed 86 times ]


1. Connection to tuning inductor
2. Connects to grid post of RF1
3. Connects to end of fixed outer winding of tuning coil assembly
4. Connects to other end of fixed outer winding of tuning coil assembly.

Attachment:
Jewett Radio Schematic (old) Rev.E Left half.jpg
Jewett Radio Schematic (old) Rev.E Left half.jpg [ 498.46 KiB | Viewed 86 times ]


Attachment:
Jewett Radio Schematic (old) Rev. E Right Half.jpg
Jewett Radio Schematic (old) Rev. E Right Half.jpg [ 1.69 MiB | Viewed 86 times ]

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Wed 19, 2022 5:03 pm 
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Maybe this is a try at drawing the inductive tuner. It shows 2 coils and 1 metal plate where there are actually 5 coils and 4 metal plates.
Attachment:
tuner.jpeg
tuner.jpeg [ 8.74 KiB | Viewed 50 times ]

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Wed 19, 2022 6:14 pm 
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I can make that change, thanks. Any ideas on the tuning problem (can't tune in a station below 910 khz)?

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 Post subject: Re: Jewett Radio Restore
PostPosted: Jan Wed 19, 2022 7:40 pm 
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Joined: May Sat 30, 2015 11:49 pm
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Location: Keystone Heights, FL, USA 32656
I would be looking for something loose or corroded connection around the antennal connections/coil connections and first tuning condenser. Plates touching when approaching fully meshed? Broken wire on the rotating coil?

Loosen and wiggle all the mechanical connections on the variable condenser and re-tighten.

Should have asked, when tuned to 910 kHz, what is the position of the variable capacitor?

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