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October 1929 QST
 Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
from
QST, published December 1915 - present (visit ARRL
for info). All copyrights hereby acknowledged.
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October 29, 1929, aka "Black
Tuesday," is a date that will live in infamy. It was the beginning of the U.S.
stock market crash that resulted in The Great Depression. Since magazines, particularly
in the pre-digital era, went to press a month or two prior to hitting the postal
system and store racks, almost nobody had any idea that by the time this issue of
QST magazine was being read, investors would be hurling themselves out
of high rise building windows and off tall bridges. As the country was coming to
grips with what would ultimately be a nearly two decade long financial struggle,
nonessential creature comforts like concert quality recorded and broadcast music
equipment like that facilitated by Sangamo Electric Company's fine condensers (capacitors)
were taking a back seat to worrying about keeping a job and buying food for your
family. Sangamo Electric, born in 1899 as an offshoot of the Illinois Watch Company,
was a major player in radio communications during World War II. Their advertisements
were on the pages of all the major electronics magazines during the era.
Sangamo Electric Company Advertisement
 Byrd Expedition
Transmitters and Receivers employ Sangamo Condensers
Away down among the ice barriers of the Antarctic ... only the dependable operation
of shortwave transmitters and receivers keeps the Byrd Expedition in touch with
the civilized world. Only the snappy kick of short wave equipment affords a plane
in trouble the protection of the mother ship.
Not unusual then, the choice of Sangamo 5000-volt Fixed Condensers for the radio
equipment. Tested at 5000 volts d.c. and 3500 a.c. and built to the world radio-known
Sangamo standard, amateurs, commercial men and manufacturers have come to rely on
Sangamo High Voltage Condensers.
Accurately rated, more than adequately tested and enclosed in an impervious Bakelite
molding - these condensers offer the maximum protection in high voltage, high frequency
circuits.
Sangamo Electric Co.
Springfield, Illinois, U. S. A.
Manufacturers of Precision Electrical Apparatus for 30 Years
Curve of Sangamo Type "A" Transformer. Note the uniformity of amplification at
all audible frequencies.
Type A straight audio amplification ... list price, $10.00
Type B Push-pull Input Transformer for all tubes ... list price, $12.00
Type C-171 Push-pull Output, for 171 or 250 type power tubes with cone speaker
... $12.00
Type D-210, same as C except for 210 and 112 power tubes, $12.00
Type H-171, Push-pull Output for 171 or 250 power tubes for Dynamic Speaker ...
list price, $12.00
Type G-210, same as type H except for 210 and 112 tubes ... $12.00
Type F Plate Impedance for use as a choke to prevent oscillation and for impedance
coupled amplifiers ... list price, $5.00
Tone!
According to musical standards
It may be true that the search for straight line audio-amplification is an out-of-proportion
effort to accomplish a small objective. It may be true that few average listeners
can really tell the difference between just "good" transformers and the best transformers!
But we do know, however, that the true beauty of music arises in seemingly small
perfections - many of them known by name to only the trained musician. And we know
that the average ear also responds, perhaps unconsciously, and derives greater pleasure
from music "as it should be."
Therefore, in designing and building Sangamo "A" Transformers even the smallest
improvement was important. No possible betterment was disregarded. Cost was disregarded,
for this transformer is built for the man who wants the best and knows that it costs
more. The core metal alone costs as much .as the total manufacturing cost of many
transformers, but it permits a dense, compact field without saturation and is worth
the money because it increases amplification in the lower registers.
So Sangamo has built this master transformer to musical standards for those who
demand the best. For the set builder to add to his pride of craftsmanship and achievement,
for the manufacturer who wants a "tone" advantage against competition.
The coupon below is for your convenience in securing complete data.
Pin this to your letterhead and mail
Sangamo Electric Co., Springfield, Ill., U. S. A.
Dept. 9421.
Sangamo Electric Co. of Canada, Ltd., 183 George St., Toronto.
_ {For manufacturers} I am interested in engineering data regarding your transformers
and condensers, also the phonograph amplifier hook-up.
_ {For dealers} Please send data on Sangamo Condensers.
_ {For set builders} Please send booklet describing your apparatus and latest
audio hook-ups. I enclose 10c to cover cost of mailing.
Posted January 19, 2023
(updated from original
post on 6/8/2016)
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