1996 - 2016
BSEE - KB3UON
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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May 1936 Radio-Craft[Table of Contents]
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.
This is another Radio Service Data Sheet that appeared in the May 1936 edition of Radio-Craft magazine. I post this schematic and functional description of the Crosley Model 1155, 11-Tube 4-Band Superhet radio manufacturers' publications for the benefit of hobbyists and archivists who might be searching for such information either in a effort to restore a radio to working condition, or to collect archival information.
("Auto-expressionator"; range, 150 kc. to 19 mc.; triple-tuned I.F.Ts.; tuning meter.)
Socket voltages are as follows, from tube to ground, using a 1,000 ohms-per-volt, meter:
*Grid 3, -5 to -30 V.
The power output is about 15.5 W., and power input 140 W. Speaker field drop, 125 V.
The I.F. alignment is accomplished by connecting the service oscillator first to the grid cap of V4, and then through a 0.02-mf. condenser to the grid cap of V2. The adjustment is made by turning the middle trimmer, never the top or bottom trimmers. Do not touch the latter.
R. F. alignment on the Blue, Red, and Green bands is accomplished with a 250 mmf, condenser connected between the service oscillator and the receiver ANT. post. A 400-ohm carbon resistor is used in place of the condenser on the Violet band. Shunt alignment frequencies are, 400, 1,700, 6,000 and 18,000 kc. Series alignment frequencies are 150, 600 and 2,500 kc.; none for Violet band.
The "auto-expressionator" is entirely automatic and needs no service, except a check to make sure the special bulbs are good.
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 152 Radio Service Data Sheets as of November 14, 2016.
Posted May 18, 2015