The PHILCO Phorum
91H Code 126 Restore - Printable Version

+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: 91H Code 126 Restore (/showthread.php?tid=25482)


91H Code 126 Restore - RealRider - 12-22-2024

Greetings Philco Phans.

After about a year since I introduced myself with an incoming Philco 91H, Code 126 it is finally time to see what I’ve gotten myself into.

   

As mentioned in my introductory topic I am not new to vintage radios but this is the oldest and first Philco I’ve had in the shop.  The information I have found on this site has been extremely helpful and after learning about the bakelite blocks and condenser banks I’m ready to assemble a list of parts needed.

At first look it appears to be unmolested but I have seen a few things that make me think it may have been in the shop sometime in its life.  The transformer is HUGE!

My plan is to first replace the electrolytics, check the input transformer for proper continuity before applying any power using a dim-bulb tester.

-> The electrolytic capacitors
- are both 6uf 400v, P/N 4916 in the schematic but are different cans with a 8095 on one and the other, which appears to be copper, the label peeled off at one time - I suspect the shorter silver one is a replacement
-  I plan on using 6.8uf 450v as replacements
-> The Bakelite Blocks and Metal-cased condensers
- there are nine of them and will heat to remove the tar but is it recommended to do this with the metal-cased condensers?
- I plan on using safety caps in the one connected to the input lines
-> Line cord
- This looks to be original and in good shape but I think the plug has been replaced, is it SOP to replace line cords?
- What would the original plug look like?
-> Cleaning tuning dial
- It’s quite yellowed but unbroken.  I do not see any way to remove it without disassembly of the tuning capacitor so will some gentle cleaning lighten it up.
-> Speaker cloth
- I found a good match at Radio Grill Cloth, #1 looks to be a close match

Well, that’s enough for now.  I’m hoping the shadow meter works but that will come much later.

RE: 91H Code 126 Restore - Radioroslyn - 12-22-2024

Hi Nick,

will heat to remove the tar but is it recommended to do this with the metal-cased condensers? 

They have a cardboard liner inside so sometimes you can just put the innards out after sniping the gnd wire. Or the tar will glue the cardboard to the tin.

Cord and plug

The last cloth cord I got was from amazom. I think it was listed in the lamp/lighting section. 7' long and abt $7 has a modern polarize plug. You can easily clip it off. The old skool plugs are commonly referred to as acorn plugs. As a side note Philco used cloth cords till '37.

Cleaning tuning dial 

I would use Qtips and odorless mineral spirits. Never use water or soap&water. This will remove the print from the dial.

I’m hoping the shadow meter works

Generally the big issue with the sm is the internal coil being open. Easy to measure the coil resistance which should be abt 1k or so. If it's 100k you'll need some 40G magnet wire a 3" 1/4 20 bolt and nut. Oh some sets have a carbon resistor in parallel w/the coil so that needs to be out of the circuit to get an accurate reading. Said resistor is on the chassis not inside the meter housing.