Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
Strike three for the trio of radio models
featured in this September 1935 issue of Radio-Craft magazine. I could not find any
instance of the Stromberg-Carlson Model 82, either. The model 82 was a wooden-case console
(floor-standing) format. It featured dual antennas that were selected automatically with the
band selection control.
See Tom Bavis' AudioPhool.com website for an extensive collection of
Stromberg-Carlson
photos, datasheets and Sam's Photofacts files.
The 6A7 tube is used as a modulator only, a separate
76 being used as the oscillator on all bands to secure more positive operation on the high
frequencies than is provided by the 6A7. Another type 76 tube is used as the demodulator and
A.V.C. The three type 42 tubes are connected as triodes, the first being a driver for the
two output tubes. The output stage works on the class AB principle, giving high audio quality.
A low-level tone compensation feature keeps the tone quality evenly balanced between bass,
treble, and middle register at the lowest volume level. A manual treble control is provided
to adjust the reception to individual desires, or to reduce background noise. This control
is continuously variable. and is combined with the on-off power switch.
The selector lite dial used on this set is designed for ease of operation, and is directly
calibrated for each band available.' Only the band in use is illuminated, the different pilot
bulbs being operated by a section of the band switch. The tuning meter is also illuminated.
A dual-ratio tuning knob gives the necessary band spread on the higher frequency bands.
The use of two separate antennas is possible with this set, since a section of the range
switch selects the right one for the band in use. The antenna terminal strip carries four
posts, marked "A", "AD", "GD", and "G". For use of the same antenna on all bands, it is connected
to the "AU" and "AD" posts, while the ground goes to the remaining two. Two separate antennas
can be used. in which case the long one for the two lower-frequency bands connects to the
"A" post, the short antenna to the "AD" post.
Posted November 16, 2017
Radio Service Data Sheets
These schematics, tuning instructions, and other data are reproduced from my
collection of vintage radio and electronics magazines. As back in the era, similar
schematic and service info was available for purchase from sources such as
SAMS Photofacts, but these printings
were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of
December 28, 2020.
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
