Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....

I made an attempt to fix it but to no avail.

Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?

The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

Hi,

I have had some success repairing/re-winding this type of coil.

Send me an email if you want me to give it a try.

Gary

:Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....
:
:I made an attempt to fix it but to no avail.
:
:Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?
:
:The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

Thanks for the offer Gary. I am going to take one more shot at fixing it today. If that goes as I expect, I will drop you a note...

:Hi,
:
:I have had some success repairing/re-winding this type of coil.
:
:Send me an email if you want me to give it a try.
:
:Gary
:
:
:
::Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....
::
::I made an attempt to fix it but to no avail.
::
::Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?
::
::The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

One point to consider,

If you can repair the coil but lose a certain percentage of one of the windings, you may still be able to tune it to the correct IF frequency by changing the value of the capacitor in parallel with the affected winding.

There are limitations to how far you can go with this, but for example, if you lose 15% of the primary winding, (the coil that is connected to pin 5 of the 12BE6), INCREASE the value of the capacitor in parallel with this winding by 15%. As an example, if the capacitor is 150 mmf, then add a 15 mmf capacitor in parallel. This will compensate for the loss of inductance and allow you to adjust the coil slug to the original IF frequency of 455KHz.

Good Luck,
Gary

Thanks for the offer Gary. I am going to take one more shot at fixing it today. If that goes as I expect, I will drop you a note...
:
::Hi,
::
::I have had some success repairing/re-winding this type of coil.
::
::Send me an email if you want me to give it a try.
::
::Gary
::
::
::
:::Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....
:::
:::I made an attempt to fix it but to no avail.
:::
:::Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?
:::
:::The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

I was just wondering how you made out with this I-F coil?

Gary

:Thanks for the offer Gary. I am going to take one more shot at fixing it today. If that goes as I expect, I will drop you a note...
:
::Hi,
::
::I have had some success repairing/re-winding this type of coil.
::
::Send me an email if you want me to give it a try.
::
::Gary
::
::
::
:::Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....
:::
:::I made an attempt to fix it but to no avail.
:::
:::Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?
:::
:::The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

Here is a great article that addresses your problem exactly.
http://antiqueradios.com/chrs/journal/transformers.html
It suggests that you by pass the open winding with a resistor then use a capacitor for coupling.
I can atest to the fact this does work. I did it.
I have a Howard 901A that had both IF cans shot. One had both windings open and the other had one winding open. When I followed the steps in the article the radio started working! Although the IF tuning seemed really broad I think.
I decided to experiment a little further and try to de-mystify my own fear of what's going on in the IF cans.
I had another old Zenith 6d-525 that had been in a fire... really cooked. I though the IFs were cooked too.
But I took them out and opened them and found that although the coils were sagging from the heat ... they were still sound. So I glued them in place a little to keep them stable and re-wired new leads in and out. The second Zenith IF used a few caps inside it that the Howard didn't show in their schematic, so I wired around them.
It was a big "finger-crossing" excercise for me... but after I put these repaired cans in the Howard... and alignened them to 455kc... that Howard played like a charm.!!
I was so proud of myself.
So if you can't repair that winding try using another IF can that physically fits from your junk box or try that resistor bypass article.

I put it on the shelf and went on to a couple of new projects. I am still planning on going back to this one and look in to the possibility of applying one of the suggestions in another response.

I will post if I get back to working on this one soon.

:
:I was just wondering how you made out with this I-F coil?
:
:Gary
:
:
::Thanks for the offer Gary. I am going to take one more shot at fixing it today. If that goes as I expect, I will drop you a note...
::
:::Hi,
:::
:::I have had some success repairing/re-winding this type of coil.
:::
:::Send me an email if you want me to give it a try.
:::
:::Gary
:::
:::
:::
::::Finally figured out what the problem is with the Crosley 9-121 I have been working with. After checking every component, replacing every tube, I finally opened the I-F Coil can and low and behold, one of the wires leading to one of the coil forms was broken. There was actually about a quarter inch section missing. I think this is where my short came from....
::::
::::I made an attempt to fix it but to no avail.
::::
::::Here is the question.... Can I get one of these anywhere? Is it even worth trying or should I just strip this thing for usable parts and scrap the rest?
::::
::::The IF is a Miller Radio Porducts 12-C1 440-475 KC input. If anyone has one laying around, let me know....

Something I can't understand is why replacement universal IF xfmrs aren't sold anywhere. AES sells an assortment of oscillator and antenna coils, but no IFs.

You can buy the little transistor-set IF xfmrs by the bushel, but I can't imagine too many people replacing IFs on a transistor radio.

About the only thing I've come up with is to pull an IF xfmr out of a junker.

Doug:
I agree... it ought to be easier. Doesn't JW Miller make universal IF replacements? I kinda felt I saw that they did... but maybe it was NOS... Aren't they still in business?
I do see them as selling coils etc at Mouser.com

Anyway I stumbled on several nice comments about IF repairs etc at this site:
http://www.qsl.net/k5bcq/HK/HK.html#REPI

and at this other site you'll find he (Gary) stocks a ton of used and new IF stuff etc.:
http://www.oldradioparts.com/2a6fla.txt

Peter

i just emailed JW miller... they said they haven't made IF transformers like this for over 20 years....