Montgomery Ward Airline
Radio Restoration

 

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Here is a challenging little project! This Montgomery Wards Airline 62-156 sat in a box in my garage for at least 5 years. It was given to me by a fellow radio collector who had decided to end his radio activity. I knew this set was a basket case and decided just to hang on to it until I had time to tackle it. Although this radio is a mess as you can see from the picture, all the pieces are there except for the speaker. I decided it was time to do something with it!
The first step in a restoration project such as this is to evaluate what you have. All the pieces were carefully examined to determine whether they could be repaired, or whether they would have to be reproduced. The front piece is made up of several thin pieces of birch veneer glued together with a walnut veneer on the front. All pieces of veneer were delaminating. The picture does not show this on the front piece very well. It was apparent that someone in the past had attempted to re-glue the veneer together. It appeared that they had some problems as some of the pieces were not lined up very well. I decided that the best solution in this case was to reproduce the front faceplate. Normally you want to retain as many original pieces as possible, but in this case the original was to far gone. Had it not been already re-glued in several places, I may have attempted to salvage the front and restore it rather than replace it.
A scrap of 5/16 inch underlayment was obtained from my wood scraps and a tracing was made from the front pieces. A jigsaw was used to carefully cut all the contours. Even though I used a good quality, fine cutting blade I still ended up with a lot of chip outs. I probably should have used a cabinet grade plywood rather than underlayment. Now that the front was cut out, I used several types of contour and round files to smooth out the cuts and also used wood filler to fill the chips and slivers of wood from the saw blade.

 

 

The next step was to reproduce the rabbet along the edge of the front piece. I cut a jig from a piece of scrap particle board so that I could use my router. I installed a collar and a 1/4 inch straight cutting bit which would allow me to use the jig as a template. The jig was positioned so that with the collar contacting it would allow the straight cutting bit to cut the proper width of the rabbet. The rabbet was cut in several passes. Next the front piece was sanded and inspected for any additional flaws.
With the front piece base completed, attention was turned to repairing the case. The flat inside support pieces were badly warped and so new ones were cut from the same thickness underlayment. The inside birch veneer was delaminated so it was re-glued first. Next the inside support pieces were glued. A new bottom was cut from a piece of 1/2 inch plywood and using the old base as a pattern, holes were drilled for the chassis. The veneer on the outside was missing several large pieces which would have been difficult to replace and look good, so the veneer on the outside was totally removed. It was saved for use on the top cap. I came off very easily!

 

 

This shows the completed front piece, ready for the front veneer. The repaired cabinet is also displayed.

 

 

Next the finish veneer was applied to the front piece over all the cut outs. The original veneer was walnut, but I chose to replace it with Honduras Mahogany because the grain is similar to walnut, but the color is much closer to the original walnut wood. Fresh cut black walnut veneer has a gray color to it and makes it harder to duplicate the original finish. There were 3 sections of veneer on this radio. The sides have the grain running up at an angle, and the front is straight up and down. First, using the original front as a guide, rough lines were traced on the front base as a guide for positioning the veneer. The veneer pieces were cut and laid on the base to check for fit. The veneer pieces were then glued on the base. An industrial strength adhesive (available from Paxton Lumber) was sprayed on both the base and the back of the veneer. The veneer was then CAREFULLY applied to the base by starting on one side of the veneer and slowly laying it on until the entire piece was attached. Then pressure was evenly applied to the entire piece to ensure that it was firmly attached. Once you press the two pieces together, you cannot remove them. You get one shot at this! Make sure you dry fit all your pieces first. Next, the birch veneer was applied to the cabinet sides. The original veneer was one piece, but I couldn't find any that was long enough so I cut the length so that it would be divided at the top. There is a cap of wood screwed on the top of this radio, so the seam won't show anyway. It also made it easier to apply the veneer. Again, you get one shot at applying! After the veneer was applied, I used my router and a 1/8 inch round nose bit to cut the vertical and horizontal lines on the front piece. Since I had not attached it to the case yet it was easy to clamp it on the bench and use the router. Next I used a sharp utility knife to cut out the holes and contours for the veneer. At this point the cabinet is ready to be glued back together. The front piece was glued to the cabinet and the base trim was glued at the bottom.


Now the fun part - the radio chassis!!

This is the unrestored radio chassis. The filter capacitors appeared to have been replaced at some time in the radio's lifetime. Most of the other capacitors appeared to be original. Except for the power cord and wires from the I.F. cans to the tube grids, most of the wiring appeared to be in decent shape and there were no wasp nests or mouse damage. When I service a radio chassis, all the paper capacitors and filter capacitors are replaced. Any resistors which have drifted more than 10% from their original value are also replaced. The volume control was disassembled and the carbon element was cleaned with WD-40 and a Q-Tip. The control shaft and sleeve were lightly lubricated and the control reassembled. The tubes were tested and cleaned. The wires coming out of the I.F. cans to the tube grids were bad and so they were replaced. The tuning capacitor was cleaned and lubricated. The speaker was missing, so a similar speaker with a similar field coil value from my parts stash was obtained and a 5 pin male plugin fashioned from a dud tube base and new wires were soldered in. Finally, a cloth covered period style power cord and plugin were installed in place of the rotting power cord. After double checking everything, the set was plugged into a Variac and the voltage slowly increased as the B+ voltage measurements were monitored. As the tubes warmed up, the set began to emit static from the speaker. A shot of WD-40 on the bandswitch and the set picked up the local AM stations!. The set was aligned and then bench tested for several hours.

Attention was now turned back to the cabinet for the finish and speaker cloth. The cabinet was lightly sanded with 220 grit sandpaper and the dust first removed with a vacuum cleaner/brush attachment, and then with an air compressor. A sealer coat of orange shellac was sprayed on the cabinet and then lightly sanded with 600 grit sandpaper. The sanding dust was again removed and then the shading toners were applied. Mohawk spray toners of medium brown for the front, and Van Dyke brown for the sides were lightly applied repeatedly until the proper shade was reached. After drying, the air compressor was used to blow any dust off and two coats of gloss lacquer were sprayed on. The speaker cloth proved to be a challenge as the original was glued to the cabinet from the inside. As the pictures indicate, I didn't get it stretched tight enough, and may have to remove and reapply it. It's very tricky to get it stretched evenly and straight. A new cardboard backing was cut out from heavy poster board material from the Art Store and then spray painted flat black. This picture shows the completed chassis bottom view, and the finished cabinet.

 

The speaker and chassis was returned to the cabinet and bolted in. There were 3 knobs in a plastic tub in the box when the radio was obtained, but they didn't fit the shafts. I located 3 matching knobs from my parts bin and fitted them on the shafts. They are not the correct knobs, but will do for now. This is a view of the completed set! It's tuned to 1350 KRNT so I can hear the Cubs lose again! I hope you enjoyed reading about my restoration project. This was definitely not a set for a beginner radio collector. I'm not a professional, but I think it turned out very well. I like the style of the radio, and now the set is playing once again.

 

 

 

 

 

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