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Philco 630X Shadow Meter - Printable Version

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Philco 630X Shadow Meter - tludka - 04-10-2022

Based on the Console cabinet and the tube layout I believe I have a Mode 630X. There are no labels on the radio and the one in the cabinet is illegible.  I have just begun disassembling the radio and I have found that the Shadow Meter coil is open. I have never worked on one of these with the shadow meter, so I have a couple of questions.
Will an inoperative meter effect the radio operation? Can the coil be rewired? Are these coils even available? The Meter is a 45-2086 and the coil in it has a number 124620 printed on it.

RE: Philco 630X Shadow Meter - Radioroslyn - 04-10-2022

In some chassis there is a resistor in parallel with the coil so if the coil is open it won't render the set inoperable. If not you can add a 1200 ohm 1w in place of the meter.

If you can remove the sm and post a few pic of it one with the bottom cover off. The early ones are pretty easy to rewind just has to be careful not to break the fine wire.

RE: Philco 630X Shadow Meter - tludka - 04-10-2022

I had removed the wires from the radio, isolated the coil and ohm the coil directly, it is open.

RE: Philco 630X Shadow Meter - Radioroslyn - 04-10-2022

If you measured it in circuit and it was open the set won't work. No parallel resistor.

RE: Philco 630X Shadow Meter - tludka - 04-10-2022

I had it out of the circuit.

     

       


   

RE: Philco 630X Shadow Meter - Radioroslyn - 04-11-2022

Looks like the old style coils.
Peel off the fish paper around the outside. Under that 1st layer you'll find the 2 contacts that the wires are soldered to. Peel off the next layer and that's where the coil is. Use small sharp knife to cut away the wire, there's a lot about 1,400'. Fit a 3" long or so bolt thru the hole in the center of the coil. The old ones are 1/4 in dia. Use a nut hold it in place so when you are winding it it doesn't spin free. use a variable speed drill to spin it. Set your spool the wire up on something like a football goalpost so it can spin freely.

If you break the wire while winding just solder back together and put a dab the nail polish on it the insulate it. If you break the wire where it start of the coil you may have to start over. Doesn't have to be super neat or in a particular direction. I've been using 40G wire just because I have some but it's not all that fun to solder the leads to.

After winding check resistance for something around 800 to 1200 ohm. Add a layer of masking tape w/the coil wires exposed. Then solder on the leads to the coil wires. A little bit of hot glue helps to hold them in place. Wrap with a layer or two the tape and that's it.   

You might find a better way to do it, this one has worked for me.

RE: Philco 630X Shadow Meter - tludka - 04-11-2022

Thanks, it might be a week or so before I can work on it but I appreciate all the information.

RE: Philco 630X Shadow Meter - Radioroslyn - 04-11-2022

Take a look at post 46-50 or so.  https://philcoradio.com/phorum/showthread.php?tid=14829&page=4

RE: Philco 630X Shadow Meter - tludka - 04-11-2022

Thanks that will be helpful.

RE: Philco 630X Shadow Meter - tludka - 06-06-2022

For those who are interested and want to spend the money, PREM Magnetics Inc. in Johnsburg, IL. Can do a Shadow Coil rewind. About $135. their e mail is tech@premmag.com