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Cannot Adjust an IF Transformer’s cores
#46

Great work, we are all looking forward to the final design.

Philco's 
86 Low Boy     71B      42-321T
90 High Boy    52B      46-1203
95 High Boy    118B     48-214     
112X Console     60B       48-206
118X Console     84B       49-506
41-608P Console   610B   76 High Boy
41-265 Console   37-89B   370LZ
52GC                38-35B
20 Baby Grand   38-10T
70 Baby Grand   41-221CI

#47

Hi Joseph, here is a great article on various types of FM detectors including the FM1000…https://www.radiomuseum.org/forumdata/users/4942/file/FM%20Alignment%20Ghirardi%201952%20OCR.pdf

Ron

Bendix 0626.      RCA 8BX5.   RCA T64
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        Crosley 52TQ
Philco 37-116.    Philco 70
AK 35                Philco 46-350
Philco 620B.       Zenith Transoceanic B-600
Philco 60B.         Majestic 50
Philco 52-944.    AK 84
#48

Thank you for sharing! I am going to take some time to review and soak this all in.

Joseph

Philco 46-480
Philco 49-906
#49

Just a quick update, folks. The PCBs have been manufactured, and shipped yesterday. Surely they’ll arrive this week. I also just submitted an order for the connectors I will need between the two PCBs. We should have a working IF transformer by the end of the week.

Joseph

Philco 46-480
Philco 49-906
#50

Awesome!!

Philco's 
86 Low Boy     71B      42-321T
90 High Boy    52B      46-1203
95 High Boy    118B     48-214     
112X Console     60B       48-206
118X Console     84B       49-506
41-608P Console   610B   76 High Boy
41-265 Console   37-89B   370LZ
52GC                38-35B
20 Baby Grand   38-10T
70 Baby Grand   41-221CI

#51

It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original insides, and soldered the new assembly to it. Then I put the metal can on top. I need to complete the full alignment (at long last), but I was able to tune into a few stations quite clearly. And the nice part is that it looks original!


Attached Files Image(s)
               

Joseph

Philco 46-480
Philco 49-906
#52

Joseph, now you are an engineer!!
#53

Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a summary of the process we went through in the Electrical Restoration category. I realize now that this thread should have been there, but that’s okay.

Joseph

Philco 46-480
Philco 49-906
#54

The abilities of our 'Phorum Pholks" never ceases to amaze me! Fantastic fabrication, Joseph! I'm waiting now for your PCB solution to the FM1000 tube scarcity. Come up with that and you would make A LOT of hobbyists happy! Take care and BE HEALTHY! Gary

"Don't pity the dead, pity the living, above all, those living without love."
Professor Albus Dumbledore
Gary - Westland Michigan
#55

Outstanding work indeed. I wish I could come up with solutions like this.

Philco's 
86 Low Boy     71B      42-321T
90 High Boy    52B      46-1203
95 High Boy    118B     48-214     
112X Console     60B       48-206
118X Console     84B       49-506
41-608P Console   610B   76 High Boy
41-265 Console   37-89B   370LZ
52GC                38-35B
20 Baby Grand   38-10T
70 Baby Grand   41-221CI

#56

Joseph, this is beyond awesome. A lot of thought and engineering went into this and you hit a home run! Now I must save this thread for future reference. Thanks for posting! Icon_thumbup

Ron

Bendix 0626.      RCA 8BX5.   RCA T64
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        Crosley 52TQ
Philco 37-116.    Philco 70
AK 35                Philco 46-350
Philco 620B.       Zenith Transoceanic B-600
Philco 60B.         Majestic 50
Philco 52-944.    AK 84
#57

Thank you all! It would not have been possible without the guidance of everyone who has weighed in. So far I’ve gotten about 8 hours of playtime out of the radio with the new IF transformer. It’s working great, but I’ve had to wiggle the IF can a few times because audio has gone quiet. Wiggling the can does the trick. I’m suspecting I have a bad solder joint, so I will have to pop it back open to address that.

Joseph

Philco 46-480
Philco 49-906
#58

I’ve taken the day off today, so I took a look at the IF transformer. I got lucky this time—there were no loose solder connections. The unit simply wasn’t fastened securely into the brass clip that holds it in place. This has resolved the audio issue.

Joseph

Philco 46-480
Philco 49-906
#59

Congrats on the easy fix. I will bookmark this great project for future use as I’m sure many others will as well.

Philco's 
86 Low Boy     71B      42-321T
90 High Boy    52B      46-1203
95 High Boy    118B     48-214     
112X Console     60B       48-206
118X Console     84B       49-506
41-608P Console   610B   76 High Boy
41-265 Console   37-89B   370LZ
52GC                38-35B
20 Baby Grand   38-10T
70 Baby Grand   41-221CI





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