Airline Lowboy
"Before"
"After"
Brand:
Airline
by
Montgomery Ward &Co.
Year
of Manufacture: Pre-June
1932
Frequency
Range: 550
-
1600 Kc
Tube
Lineup:
80
Rectifier, 45
Audio Output, 224
1
st. R.F.,
224
2nd R.F., 224
Detector
Schematic:
Available
here,
courtesy
of Nostalgia Air.
On
a Saturday in the fall of 2005 I was spending my
weekend like usual, cruising antique stores. I came across a newer
store in downtown Corydon, by a creek. When I entered the store I was
greeting by this miserable looking radio. They guy running the counter
knew me from some radio transactions a few years ago, so he offered me
a lower price. They had this one priced at $75.00, which I though was
way too much for its condition. I told him no thanks.
By the time I looked over the rest of the store and
was ready to leave, he once again confronted me with an offer, this
time at $30.00. I could tell they wanted to get rid of this thing
badly. At the time I was near critical mass on radios, so I ended up
packing this into the back seat of my Grand Am. It pretty much sat in
storage for a year until November 2006, when I finally took it apart to
see if it was halfway restorable.
The condition looked rather grim. The cabinet had
quite a bit of veneer damage, the two back feet were rotted off, and
many of the joints had come loose and were crudely nailed together.
The grill over the speaker was broken in multiple places, and the grill
cloth was pretty much destroyed. The original finish was almost totally
gone. The chassis was not much better. From the rear it looked complete
and untouched, but after removal I saw the true story. This thing had
obviously seen some fair amounts of moisture in its day, considering
the chassis was covered in rust. A mouse had also made a nest under the
chassis, eating up most of the cloth covered wiring. Despite the
condition, I decided that a total restoration was in order.
Electronic Restoration
The initial inspection
of the chassis did not look very promising. The first job was to remove
the dust and mouse nest debris. This was accomplished using a brush and
a vacuum. With the debris gone, this
revealed more problems not seen at first. The next step was a total
disassemble of the upper chassis, taking many notes along the way. Below two photos: The chassis before
restoration began.
When
the upper components were removed, a good cleaning with a brass
wire brush was in order. This removed much of the loose paint and large
sections of rust. There were a few stubborn parts that required the use
of some jellied rust remover to clean them. After this the chassis was
scrubbed down with mineral spirits to remove and oil or grease. Then
various parts were masked off so it could be painted. Below: The
chassis masked off ready to be cleaned.
With
the chassis clean, it was ready to be painted. Gloss black
lacquer was used on the chassis, tube shield, and other originally
black parts.
The tuning capacitor was painted silver aluminum with a layer of gloss
lacquer. After this was complete, it was time to begin work on the
wiring. Not knowing a model number, an inquiry was posted on the Antique Radio
Forums, and a few models were mentioned that use this same tube
lineup. This radio must be either a model 62-070 Princess, or a
model 62-060 Challenger Jr., which is in Riders volume 2-7. With a
schematic on hand, it was time to get this thing working. The first
repairs were
fixing the obvious shorted wires, and replacing the electrolytic
capacitors. The radio was then
then powered up while observing the amperage draw in the
process. No shorts or smoke, but no sound either.
Now it was time to tackle the rewiring job. Using
reproduction cloth covered wire from Radiodaze, almost every wire on
the chassis had to be replaced. After this was complete, other
components were checked. Everything seemed to check out ok
except for a large multi tap resistor. It was suppose to read
1000
and
2600 ohms on each section, but both were open. I rooted though my parts
drawers and found some replacements that would work, and were high
enough wattage for the application. With these repairs finished, it was
time to test the tubes. Everything checked out ok with the exception
of a 224, which had no emissions. The final step was cleaning the
lubing all of the controls. Below
photos: The repainted (left) and rewired (right) chassis.
When
powering up the radio this time I was greeted
by loud and clear reception. Since this is a TRF tube receiver, the
alignment was done by adjusting the three trimmers on the tuning
capacitor. The dial scale was very dirty and had some large globs of
hard dirt caked on it. Some orange cleaning wipes were used to
remove the greasy dirt. I tested the wipes out on a small corner to
make sure
that they wouldn't cause any damage to the lettering first. For the
age, former condition, and type of receiver, this one sounds
exceptionally good.
Cabinet Restoration
With the chassis up and running, it was
time to restore the cabinet. This radio must have been stored in an
outdoor building with lots of moisture at one time. The evidence of
this was the lifting/warped veneer, the back two feet being rotted off,
and the cabinet was full of mud dauber nests. The fist job was to
repair the veneer. All of the veneer on the bottom of the sides was
lifted and warped. Since I have very little experience with this type
of work, a few experiments were a must. Since heat and water make wood
pliable, I decided to carefully use an old clothes iron, a wet rag, and
some water soften the veneer. When the veneer became soft, a large flat
board was clamped down over it, and when the wood dried out, the veneer
was once again flat. Once all of the wood repairs were complete,
everything was reglued. Below
center: The final loose parts are clamped
in place and glued.
The next step was to
remove the remains of the original finish, and the newer finish that
someone had applied overt op of that. A scrubbing pad and some mineral
spirits pretty much got rid of these. The entire cabinet was then
sanded with some 220 grit sand paper and wiped clean with a tack
cloth. Next some some Bartley's brand wood filler was applied,
letting it dry for 24 hours, and then once gain sanded. This pretty
much had the cabinet ready for a new finish. The only remaining problem
was the back two feet, which were missing the bottom inch due to rot. I
used some stainable wood filler to fill in the missing portion, and
then sanded it to shape. To match up the filler with the rest of the
wood, and little bit of walnut stain was applied. Below center: One of
the rotten feet.
Now it was finally time
to to spray on some new lacquer. With no available photos of the
original finish or color, I had to improvise. I looked over several
radios with the original finishes, and decided on a color scheme. Using
Mowhawk brand toning lacquers, I coated the entire cabinet with "medium
brown Walnut", and then darkened certain areas with "extra dark
Walnut". Since I was restoring this in the middle of December, the
average temperate in my area is only in the 30's during the day. That
is not a good temperature to spray lacquers, but luckily there was one
Saturday that was up in the mid 40's, which was close enough for me.
Once the cabinet had been toned, several coats of clear lacquer were
applied.
With the cabinet refinished, the only thing
left was to replace the grill cloth. The original cloth was very dirty,
and torn in several places, so it was not salvageable.A close match for
a replacement was found at Radiodaze
(part number GRC 40).
This was installed to the original mounting board using some spray
adhesive. Below center: the original
and replacement grill cloths.