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
The Brunswick Panatrope
was billed as the world's first all-electric phonograph (as opposed to the mechanical crank-up models), combined with an
AM radio. It was designed
with the assistance of RCA, many of whose components were integrated into the unit. A video of a restored Panatrope is
embedded on the page below the data sheet.
this receiver a radio-record switch, Sw2, cable and input transformer, T4, are used, in order that the low-impedance of
the pick-up may be matched with the relatively high input impedance existing in the primary of T1. Referring to the parts
layout sketch, units TC1, TC2, TC3 and TC4 are trimmer condensers in shunt to the tuning condensers but not shown in the
schematic circuit. This receiver is in three sections: The R.F. chassis, the "SPU" (socket-power-unit) chassis and the dynamic
reproducer. Field current for the latter is supplied by the SPU. Note that operation of the receiver should not be attempted
unless either the field coil of a dynamic or a 600-ohm resistor is connected across the terminals for the two "field" leads;
this resistor must be capable of carrying 100 ma. To facilitate service, the RF. chassis and SPU chassis are bolted to a
single mounting board which, in turn, may be removed from the cabinet by removing retaining bolts at the rear of the mounting
Brunswick Model 31 Combination Radio and Panatrope Radio Service Data Sheet
Restored Brunswick Panatrope
Posted June 9, 2016
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 202 Radio Service Data Sheets as of July 21, 2017.
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
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on the RF Cafe website are hereby acknowledged.