1947 Motorola Model 67-X

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The back wasn't in good shape. At least it was still there, held on by a single screw on the bottom right.
Next to the model number 67X is the number 12. This designates the ivory colored case. The brown version was "11."
Like the rest of the radio, the back is 71 years old. The "AERO VANE HIGH EFFICIENCY LOOP" antenna is supposed to be attached to it.
See that screw in the corner on the right? That's a good way to crack a radio cabinet. The radio wasn't made with that screw in it.

It was washed off in the laundry tub. When it was good and wet it was placed between some boards and a weighted metal plate and left out in the hot sun. The next day it was more or less flat. 

I see faces. Cartoon faces. What are these for?
To repair the missing corner a patch was made. Cardboard outsides, with paper added inside till the thickness was the same as the back. Then it was all glued together in a sandwich. So that the glue wouldn't add to the thickness, a ten pound weight was left on it overnight.

The patch inserted. Center and right, a damaged screw hole was reinforced.


The back was flat but flimsy. If you took it outside into the humidity it quickly became limp. A thin piece of cardboard was glued to the inside with carpenters glue. According to the glue bottle, it dries harder than wood. Weights were placed on it to  make sure it dried flat. The cardboard also reinforced the patch in the corner.

Andrea made me this tool to make the holes in the cardboard. It was a piece of a metal tube that she took a file to. To use it, you turn it over, press it down onto the cardboard and twist it back and forth till it cuts the hole.

It was given a coat of Polyurethane. The next day, the antenna was tested and installed.
It still looks like crap but now it is very hard. I would have bought a reproduction but nobody makes one.

Two of these are needed to hold the back on. The radio came with only one. Where is the other? Grandpa found it on the floor in 1955. Not knowing where it came from, he put it in the junk drawer. 
On the left is what you get when you don't have a drill press. No matter how plumb you think the drill is, it's not. The drill bit starts out in the center and comes out the other side off-center.

Then I had an idea. Pilot holes were drilled in the center of both sides going halfway in, the logic being that if they were crooked, they would only be half as crooked. Somehow the holes met up, or almost met up. When the larger bit went through,  it was guided by the pilot holes and exited the pilot hole on the other side.

While I was making the wooden standoff, the mailman came and brought a Sam's Photofact Folder and two reproduction knobs!  I was so happy, I gave him a tip: "Don't smoke in bed."

I had scoured the Internet looking for Motorola knobs and these were the only ones out there. For some reason they are very rare.

According to the Sam's Folder, the burned up resistor is part number 31 - 100 Ohms. The Folder (actually just 4 pages on a single sheet of paper) is dated December 1947, same as the radio.

Obviously I had to paint the knobs. I was afraid to color in the gold circles.
They came from  www.renovatedradios.com
Later, I found they also needed shafts, so I gave them the shaft. You might ask, "Where did you get knob shafts??" An obvious source would be to cut the shafts off some junk knobs, but these came from Julie and Marty McCall. They travel the East Coast selling knobs at radio shows and we met them at Kutztown, PA.
They GAVE them to me. They don't have a website but I found an article about them here.

 I drilled holes into the knobs with a Dremel grinding wheel to insert the shafts.