Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!

http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf

:Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Sorry - need to proofread before submitting lol. The transformer coil I have has the outside winding open, as referenced as points 3 and 4 on the print. I assumed it was the secondary but maybe it isn't. Sorry for the confusion.

:I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:
:http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:
::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Tony,

The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.

Radiodoc
**********

:I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:
:http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:
::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

:Tony,
:
:The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
:
:Radiodoc
:**********

Tony,

I should have mentioned the wire should be insulated such as enamel covered magnet wire.

Radiodoc
**********

:
:
::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
::
::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
::
:::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?

::Tony,
::
::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
::
::Radiodoc
::**********
:
:Tony,
:
:I should have mentioned the wire should be insulated such as enamel covered magnet wire.
:
:Radiodoc
:**********
:
:
::
::
:::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:::
:::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:::
::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Replacement for the insulating strip that is.

:Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?
:
:::Tony,
:::
:::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
:::
:::Radiodoc
:::**********
::
::Tony,
::
::I should have mentioned the wire should be insulated such as enamel covered magnet wire.
::
::Radiodoc
::**********
::
::
:::
:::
::::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
::::
::::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
::::
:::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Tony J.,

Some type of thin plastic or perhaps a good grade of plastic electrical tape. Others on here may have a better suggestion.

Radiodoc
**********

:Replacement for the insulating strip that is.
:
::Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?
::
::::Tony,
::::
::::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
::::
::::Radiodoc
::::**********
:::
:::Tony,
:::
:::I should have mentioned the wire should be insulated such as enamel covered magnet wire.
:::
:::Radiodoc
:::**********
:::
:::
::::
::::
:::::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:::::
:::::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:::::
::::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Tony,
I'm not sure I understand your question, but here goes. A narrow strip of double sticky (read photo mounting) tape layed over the existing (good) winding will hold the new winding in place as you add turns. Then fold the ends of the tape back over the completed winding. Even a spot of fast drying super glue CA+/CA++ from hobby stores (read cars airplanes/trains) will hold the first few turns, and then for further stability melt some new wax onto it. Parafin wax from the local grocery store works well, and it usually resides in the canning/jelly making jars area.

marv

:Replacement for the insulating strip that is.
:
::Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?
::
::::Tony,
::::
::::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
::::
::::Radiodoc
::::**********
:::
:::Tony,
:::
:::I should have mentioned the wire should be insulated such as enamel covered magnet wire.
:::
:::Radiodoc
:::**********
:::
:::
::::
::::
:::::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:::::
:::::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:::::
::::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Thanks - that's what I was asking. I clicked submit before proofreading my post and tried to clarify it after. I may give that a shot.

Another thing someone suggested was using an AES universal oscillator (70-OSC) instead. Anyone have experience with using those?

TonyJ

:Tony,
:I'm not sure I understand your question, but here goes. A narrow strip of double sticky (read photo mounting) tape layed over the existing (good) winding will hold the new winding in place as you add turns. Then fold the ends of the tape back over the completed winding. Even a spot of fast drying super glue CA+/CA++ from hobby stores (read cars airplanes/trains) will hold the first few turns, and then for further stability melt some new wax onto it. Parafin wax from the local grocery store works well, and it usually resides in the canning/jelly making jars area.
:
:marv
:
::Replacement for the insulating strip that is.
::
:::Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?
:::
:::::Tony,
:::::
:::::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
:::::
:::::Radiodoc
:::::**********
::::
::::Tony,
::::
::::I should have mentioned the wire should be insulated such as enamel covered magnet wire.
::::
::::Radiodoc
::::**********
::::
::::
:::::
:::::
::::::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
::::::
::::::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
::::::
:::::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Tony,
The winding between terminals 3-4 appears to be an untuned feedback coil to sustain oscillations, and probably uncritical in the number of turns or wire size. The series DC resistance being stated, should be easy to duplicate over the primary. As others have suggested, the core form may accept a purchased RF choke of appropriate physical/electrical size inserted inside, and stabilized with glue/wax.

marv

:Thanks - that's what I was asking. I clicked submit before proofreading my post and tried to clarify it after. I may give that a shot.
:
:Another thing someone suggested was using an AES universal oscillator (70-OSC) instead. Anyone have experience with using those?
:
:TonyJ
:
::Tony,
::I'm not sure I understand your question, but here goes. A narrow strip of double sticky (read photo mounting) tape layed over the existing (good) winding will hold the new winding in place as you add turns. Then fold the ends of the tape back over the completed winding. Even a spot of fast drying super glue CA+/CA++ from hobby stores (read cars airplanes/trains) will hold the first few turns, and then for further stability melt some new wax onto it. Parafin wax from the local grocery store works well, and it usually resides in the canning/jelly making jars area.
::
::marv
::
:::Replacement for the insulating strip that is.
:::
::::Thanks - I may give that a try. Since I had a parts set with the same problem, I removed the outer winding completely as well as the insulating strip and cleaned it up from the years of grime and excess wax. What would be a good material to use as a replacement?
::::
::::::Tony,
::::::
::::::The winding between terminals 3 & 4 is not critical. You may try winding several turns of small diameter wire (#28 - #30 or so gauge) and see if you can stuff it inside the oscillator coil and hook it to terminals 3 & 4 and see if you can get the oscillator to work. You may have to reverse the leads from your coil to get the oscillator to work.
::::::
::::::Radiodoc
::::::**********
:::::
:::::Tony,
:::::
:::::I should have mentioned the wire should be insulated such as enamel covered magnet wire.
:::::
:::::Radiodoc
:::::**********
:::::
:::::
::::::
::::::
:::::::I've been looking at other mentions of coil wound transformers where it's mentioned that the outside winding is actually the primary. In this problem oscillator transformer I have, it is the outside winding as referenced as terminals 3 and 4 on the print. Any help with this one would be appreciated - thanks!
:::::::
:::::::http://www.nostalgiaair.org/PagesByModel/236/M0013236.pdf
:::::::
::::::::Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

:Started working on a Philco 38-12 yesterday and found that the secondary winding of the oscillator transformer is open. Have a junk parts set I bought off an auction site and that also has a bad winding (of course). Anyone have experience in rewinding these? I'm wondering about gauge of wire, number of turns, direction etc. and how difficult it is. I've read on other posts that often times rewound coils don't track properly or perform well. Thanks in advance!

Tony-
I just ran into this post.
I have a 38-12 set that I robbed the speaker for 38-15 model that had a bad field coil. The 38-12 works good, just haven't found a replacement speaker for her yet.
If you are not really into rewinding the coil, let me know. We'll work something out.

Thanks - I'll keep that in mind. I did end up taking the coil out of the parts set and wound around 30 turns of #34 wire on it but haven't had a chance to put it in the set and test it. I'll check the speaker on my parts set also, but seem to think that the cone may be shot. The parts set is in pretty rough shape.

:Tony-
:I just ran into this post.
:I have a 38-12 set that I robbed the speaker for 38-15 model that had a bad field coil. The 38-12 works good, just haven't found a replacement speaker for her yet.
:If you are not really into rewinding the coil, let me know. We'll work something out.

Lemme know if you wanna get rid of that speaker!

:Thanks - I'll keep that in mind. I did end up taking the coil out of the parts set and wound around 30 turns of #34 wire on it but haven't had a chance to put it in the set and test it. I'll check the speaker on my parts set also, but seem to think that the cone may be shot. The parts set is in pretty rough shape.
:
::Tony-
::I just ran into this post.
::I have a 38-12 set that I robbed the speaker for 38-15 model that had a bad field coil. The 38-12 works good, just haven't found a replacement speaker for her yet.
::If you are not really into rewinding the coil, let me know. We'll work something out.

Will do. The cone on the junker set is trashed as I thought. When I get some time to get back to the set and verify my speaker coils are good I'll let you know. If you want to pop me an email on it, I'll keep on my to-do list.

:Lemme know if you wanna get rid of that speaker!
:
::Thanks - I'll keep that in mind. I did end up taking the coil out of the parts set and wound around 30 turns of #34 wire on it but haven't had a chance to put it in the set and test it. I'll check the speaker on my parts set also, but seem to think that the cone may be shot. The parts set is in pretty rough shape.

Blackbird,

I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?

Learning

What is the model number of your set?

:Blackbird,
:
:I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
:
:Learning

60

:What is the model number of your set?
:
::Blackbird,
::
::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
::
::Learning

I don't see the info on the schematic listed here - sorry. Best bet is to wait until someone more seasoned can help with this one or a better schematic may be available from www.philcorepairbench.com

:60
:
:
::What is the model number of your set?
::
:::Blackbird,
:::
:::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
:::
:::Learning

How do I get you email addy?
Blackbird

:I don't see the info on the schematic listed here - sorry. Best bet is to wait until someone more seasoned can help with this one or a better schematic may be available from www.philcorepairbench.com
:
::60
::
::
:::What is the model number of your set?
:::
::::Blackbird,
::::
::::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
::::
::::Learning

tonyj.senior @ gmail.com will work. Also, if you enter an optional email addy in making a post, the poster's name becomes a hyperlink for your mail client.

:How do I get you email addy?
:Blackbird
:
:
::I don't see the info on the schematic listed here - sorry. Best bet is to wait until someone more seasoned can help with this one or a better schematic may be available from www.philcorepairbench.com
::
:::60
:::
:::
::::What is the model number of your set?
::::
:::::Blackbird,
:::::
:::::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
:::::
:::::Learning

Oops - remove the spaces on either side of the @ of course, lol. Forgot to mention that :)

:tonyj.senior @ gmail.com will work. Also, if you enter an optional email addy in making a post, the poster's name becomes a hyperlink for your mail client.

The coil on the 60 is more that likely way different than the 38-12 coil. (size, ohms, and characteristics) Download your schematic and ID what circuit isn't operating properly. (if you haven't yet) The voltage table is a good start.
Make sure those old electrolytic capacitors are replaced first though.

:60
:
:
::What is the model number of your set?
::
:::Blackbird,
:::
:::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
:::
:::Learning

Also you'll have to trace the cicuit path to see what is hooked where. Items like resistors, caps, ect are numbered thus giving away what part of the coil is hooked to what. It can take time, but do just that, take you time, ohm things out, check voltages, connections ect.

:The coil on the 60 is more that likely way different than the 38-12 coil. (size, ohms, and characteristics) Download your schematic and ID what circuit isn't operating properly. (if you haven't yet) The voltage table is a good start.
:Make sure those old electrolytic capacitors are replaced first though.
:
:
::60
::
::
:::What is the model number of your set?
:::
::::Blackbird,
::::
::::I have an older set than the 38-12 mentioned here, with a dead oscillator coil, too. Mine has six lugs - one on (top) and five on the bottom. How do I tell which is which tap number?
::::
::::Learning