Crosley
715N
"Before"
"After"
Brand: Crosley Year of Manufacture: 1935 Frequency Range(s): 550 - 1600 Kc, 1.7 - 4.5 Mc, 6 - 15Mc
Tube Lineup: 80 Rectifier,
42 Output, 76 Detector,
76 1st A.F. Amp, 6B7 I.F. Amp/AVC, 6A7
Osc/Mod, 6D6 R.F. Amp
Schematic:
Available here,
courtesy
of Nostalgia Air. Riders 6-22
I
always seem to find myself faced with a never ending problem, and I'm
sure that other collectors can relate. No free room to store my junk!
One rainy Thursday night in November 2006, my free time between work
and class was being spent as usual, browsing the stores and markets.
This one was found at a large indoor flea market, the same market where
I have purchased several radios lately. An initial examination showed
that this radio was quite restorable, and the original finish was in
excellent shape. The price was decent, at $59.00, but due to the whole
lack of free space thing, it had to be passed up.
Several weeks later I returned to the mall, hoping
that this radio had sold so I wouldn't have to buy it. Sure enough, it
was still sitting right where I last saw it, so it was packed into my
truck for the drive home. Condition wise, one knob was
incorrect, the grille cloth was trashed, but the original finish was
restorable. The chassis looked decent, until it was removed from the
cabinet. The entire bottom of the chassis was coated with the black tar
like substance from the power transformer, and the primary windings
were open. Below center: Black wax
like tar, from a burnt up power transformer.
Electronic Restoration
Before
any
work was preformed on the chassis, a new power transformer had to
be obtained. When inquiring about a replacement, several factors had to
be determined. A minimum rating was calculated using a RCA Tube Manual.
The transformer on this radio is mounted next to the tuning capacitor,
and close to some tubes so overall dimensions were critical. A
replacement was located at Play
Things
of Past. With the new transformer on hand, next came a
thorough cleaning to remove the black tar from the top and bottom of
the chassis. Below center: The bad
power transformer, and one of the shorted electrolytic capacitors.
Since the replacement transformer was larger than
the original, new bolt holes had to be drilled. Once everything
was mounted, an electronic overhaul could begin. In my restorations,
the original capacitors are almost always re-stuffed to retain the
original appearance. This radio had been worked on so many times during
it's lifetime, that very few, if any original capacitors were still
present. Without having to take to time to re-stuff, the repairs went
rather fast on this one. A new cloth cover cord was installed, along
with an in line fuse to for protection.
The first power up seemed to go good. Amperage draw
was ok, and the radio was playing with a few minor problems. An
alignment was preformed using the procedure on the schematic. The final
repair was a thorough cleaning on the band switch and volume control.
It was later determine that the power transformer had been cooked
due to a shorted electrolytic capacitor. A good reason NEVER to plug in
a radio until it has been properly serviced.
Cosmetic Restoration
The
cabinet only required a few minor repairs to have it looking good
enough for display. Since the original finish was mostly intact, it
would be touched up and preserved. The cabinet was washed using mineral
spirits and a scrubbing pad. This removed the dirt and and loose or
flaking lacquer. To blend in the many scratches and discolored areas,
the whole cabinet was wiped down with a dark colored stain, "Special
Walnut" color was used. With the excess stain wiped off, the cabinet
was ready for a new coat of lacquer. A few coats of Def brand clear
lacquer were applied to seal in the original finish.
A new grille cloth was purchased from Radio Daze. Patter GRC 12 was
used. The missing knob was purchased from Mike
Koste
from Gobs of Knobs.
This radio was sold in March 2008 due to collection
downsizing efforts.