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 Post subject: Ceramic trimmer capacitor helpl
PostPosted: Nov Sun 10, 2019 1:54 am 
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Joined: Jul Sat 20, 2019 10:38 pm
Posts: 1
I’m restoring a Philco 42 PT7 radio as my very first radio restoration. I unfortunately was dumb and took the I.F out of its can to replace a couple shotty wires and managed to accidentally disconnect all the coil wires from the capacitor... I took pics before hand but I can’t for sure recognize where they all went. I’m hoping someone on here can guide me so I can make sure they get put back in the proper spots please?

Thank you!


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 Post subject: Re: Ceramic trimmer capacitor helpl
PostPosted: Nov Sun 10, 2019 3:04 am 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 10009
Location: Santa Rosa, CA
I think this is for a tube radio, not a transistor radio?

Rich


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 Post subject: Re: Ceramic trimmer capacitor helpl
PostPosted: Dec Tue 03, 2019 4:16 am 
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Joined: Oct Thu 18, 2007 11:34 am
Posts: 4176
Location: Port Orchard, Wa 98366
The Schematic is in Riders Vol 14, Philcopage 17-18.
The PDF page is 697

You will see the coil resistances which you will have to measure. Then you can determine which coil is primary and secondary.
Did you mark the I.F. can as far as which way it was before removal?
I don't think (however I may be wrong) it matters which lead goes to which side of the coil. You may have to try swapping those fragile wires. If the two coils interact (induction). Resulting in a Weaker signal throughput.

The coils along with the trimmers make a filter to remove the RF frequency from the mixture of RF-IF frequencies. It will allow the IF frequency to pass to the next stage. The primary coil is the output from the prior tube and the secondary coil Transfers that signal to the next tube's grid.

You may have to see if the other IF can could be used as an example as far as lead position and connections from the coils, inside the can to caps connections.

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