Brand:John Meck Industries Inc..
Year Of Manufacture: 1948 Frequency Range: 550 - 1700KC
Tube
lineup:35Z5 Rectifier, 50L6 GT Output, 12SQ7, 12SG7 Schematic:Available here, courtesy of Nostalgia Air. Riders 22-1
This
radio, and a RCA 8X542, were
high school graduation gifts in
June of 2004. This radio was made in Plymouth, Indiana by John Meck
Industries, Inc. Other than the paper label on the bottom, the
only other markings on the radio are "Custom, Mirror - Tone", which is
located on the dial. Some research revealed that this was a somewhat
unknown manufacture that made cheap radios. The quality of the radio
supports that information. It looks like they used whatever parts they
had laying around,
thus several of the component values were way off from the schematic
values. This radio also uses what looks like a TRF ( tuned
radio frequency ) type receiver, instead of the more common
superheterodyne type.
Electronic
Restoration
This radio received the
usual treatment when repairing the electronics. All paper and
electrolytic capacitors were replaced. A new brown power cord was also
installed and
the switch and volume control were cleaned/lubricated. The
old dust on the
chassis was removed with a vacuum cleaner and a paintbrush. This radio
uses the chassis as a common connection in the circuit, so depending on
which way the power cord is plugged into a receptacle, the chassis
could be hot with 120 volts AC. To prevent a potential deadly shock to
me or my test equipment while working on this radio, an isolation
transformer will be used along with a variac to test the radio.
When first powered up, the radio wasn't making any
sounds
at all, the tubes were not even lighting up. While testing the
tubes, a 12SG7 was found to have an open filament, and the 35Z5 GT had
an
internal short. After replacing these tubes, the radio was making
a few sounds, and a few weak stations could be heard. Something
had to be wrong. After doing some
research, what looked like the usual mica capacitors, which
rarely go bad, were really paper types stuffed into the same
shells. Below center: The deceiving capacitors circled in red.
After
replacing the remaining capacitors the radio was receiving
several stations with a long wire antenna attached. With a few minor
adjustment to the two trimmer capacitors located on the tuning
cap, a few strong local stations could be picked up.
Cabinet Restoration
As
you can see in the "before" photo, the cabinet needed some work.
First thing on the list was a good cleaning with some soapy water,
taking care to mask off the paper label on the bottom. This made the
cabinet look a little better, but there were still many, many paint
chips. Since this radio was not very valuable, a repainting was in
order.
Some 3M brand, 400 grit
wet/dry sandpaper was used to
smooth out the paint chips. The cabinet was then wiped down with
mineral
spirits to remove any dirt or grease. Three
light coats of Rust-Oleum brand gray primer was sprayed on as a base
coat. Waiting 24
hours after this dried, the cabinet was once again sanded, but with 800
grit
wet/dry sandpaper. The final step before the paint would be sprayed on
was a cleaning with a sticky tack cloth to remove dust and particles.
Ivory gloss colored Krylon brand spray paint was used for the final
three light coats. After this had dried, a few coats of clear gloss
lacquer were sprayed on. The end result doesn't look
perfect, but it looks pretty good for my first cabinet repainting.
Finding a pair of knobs for this radio would prove
to be challenging. When searching online for a photo of this model, I
came across an article on the rec.antiques.radio+phono
newsgroup from 2001, where the repairman mentioned working on this
model. I threw him some email, and received a reply from him with a
photo of his radio with the original knobs and a sketch of the back (
Thanks Ed, aka: Blacksmith! ). After posting a few want adds online,
some knobs were
tracked down ( Thanks Mike!). With the knobs
out of the way, I could focus on the missing back. Using some 1/8"
thick Masonite type board from a local hardware store, a replacement
was
recreated diagram that Ed had supplied. The plastic dial
cover only required some cleaning with Novus brand polishes to have it
shinning again.