|"Twelve tube superheterodyne (16 tube
functions) tunes American and Foreign
broadcasts, police, airplane, amateur and ships.
This receiver combines conventional tuning and
Selectronne, a simple six push button electric
tuning device for your six favorite American
Twelve inch electro-dynamic speaker with
Push-Pull triode output.
Alto-basso tone control.
Viso-glo tuning tube.
Automatic volume control.
Automatic frequency control.
Centralized nerve system.
Aerial band matching transformers.
Separate coils for each band.
Large walnut cabinet"
|"The SELECTRONNE contains no moving parts but the button
switches....no motors...no complicated mechanisms. It is
instantaneous and simple in operation as a door bell"
|"Sparton offers you choice of 24 quality models
all featuring clean cut reception on a noiseless
background with scores of last minute
refinements. See and hear Sparton before you
buy any radio set"
"An AMAZING revolution in radio tuning! Quicker
than a flash. Simple as a door bell"
|Alternative Automatic Tuning Devices of the late 1930s
Some manufacturers offered purely mechanical approaches to auto-
matic tuning. A number of these were based on rotary dials, while oth-
ers used mechanical push-button assemblies. Zenith, one of the ear-
ly pioneers of push-button tuning back in the late twenties, mercifully
skipped 1938 and introduced it in their 1939 line. Instead they went
on in 1938 to produce some of today's most coveted models - their
series with the much beloved tear-drop shaped escutcheons and big
black robot dials, some with motorized tuning!
A few of the automatic tuning systems available during the late '30s...
Sparton Selectronne Tuning (electric, push-button)..............................
Fada Flash-O-Matic (electrical, rotary control)......................................
Firestone Dial-a-matic tuning
Silvertone Moto-matic tuning (push-button)
Stewart Warner Magic Keyboard (push-button, mechanical)..
RCA Electric Tuning (push-button, electric)
Philco Cone-Centric Tuning (Rotary, mechanical)..................................
Philco Automatic Tuning (Rotary, mechanical with AFC)..................
General Electric Touch-Tuning (push-button, electric)
Delco Delco-Matic finger-tip tuning (push-button, electric)
Wells Gardner "Auto selection Dial" (rotary, mechanical)
Crosley "Prestotune" (push-button)
Westinghouse Multi-station tuner (rotary push-button,
Stromberg Carlson "flash tuning" (push-button, electric)......................
Zenith "Trans-continental Tip-Touch Tuning"
|SPARTON features latest improvements for Radios
Press one of six buttons below the call letters of a favorite
station listed on the instrument panel of a Sparton Select-
ronne equipped model... the desired station responds, imm-
ediately. Press one after the other of the six buttons and
thus quickly sample the programs of the moment, from all
six...without even a glance at the dial. There are no motors,
no moving parts but the switch buttons. The tuning is exper-
tly accurate. The response is full-toned.
A touch of the band selector switch...the receiver instantly
changes to an efficient, ultra-modern all wave radio model
of surprising performance, ready to tune American and for-
eign broadcast and shortwave, Airplane, Police, Amateur and
Other Sparton features:
All models are engineered to introduce into the aerial circuit
a separate transformer to match the aerial to the band in
use for maximum sensitivity and minimum interference,
controlled by the band selector switch.
All amplifier circuits of the respective receiver are used on
each band providing full sensitivity on foreign and shortwave
bands as well as the broadcast band.
A full and separate set of coils for each band provide a
further increase in sensitivity for all Sparton models and
further remove background and interference noises from
A highly efficient design concentrating the radio frequency
coils in a central, shielded assembly for shortest leads and
maximum amplification of the incoming signal without inter-
Protection against change in calibration of the receiver due
to humidity or varying weather conditions.
Eliminate interference from code stations.
Efficient audio tube types for maximum amplification with
faithful reproduction. For full toned response from the
lowest to the highest volume desired. Maintains the output
volume at the level selected by the volume control on all
stations regardless of signal strength or proximity. Prev-
ents blasting and offsets fading.
A highly specialized method of permitting the user to select
the most enjoyable tone shading of any program or trans-
mission. High-Fidelity in the central position. Continuously
variable preponderance of low, deep or high, brilliant tones
as desired in the right and left positions. Makes available
high volumes with full excellence of tonal response. Insures
full depth of tone at low volume. Provides a volume reserve
for impressive rendition of crescendo passages with Sym-
phonic Tone Expansion expression. Circuits which automatic-
ally restore that expression and feeling which marks the
performance of masters and artists. The wide variation in
emphasis as heard in the studio becomes leveled off in
transmission and is restored in the receiver.
|"At the measured speed of 186,000 miles per second...speed of an
electric impulse...gives you six of your favorite chain or local
stations at the ....flash...touch of a button. In a few fleeting
seconds you can sample all six successively and keep on to enjoy
the program you like best"