Emerson Model 415 Bakelite Table Radio (1933/1934)
The Emerson 415 is a very ornate
standard-broadcast receiver featuring
a 4-tube Tuned-Radio-Frequency
(TRF) chassis. The tube  line-up is
6D6 (RF amp), 6C6 (2nd detector), 38
(audio amp) and 1-V (rectifier). Early
production used the alternate tube
complement:- 78 (RF amp), 77 (2nd
detector), 38 (af amp), 1-V (rectifier).
A special high-impedance permanent
magnet moving armature type loud-
speaker was used. The radio could
originally be purchased for around
$17.95.
Schematic.

This was one of several models to use
this cabinet style in the 1933 and 34
seasons. The first was model 20A
(1933), which used Emerson's 4-tube
G-4 TRF chassis (also used on the
model 25A). The following season saw
the introduction of models 415 (as
here) and 420. Some of the 20A and
25A production and all the 420 models
featured a 7-pin receptacle at the rear
for connection to one of two optional
Emerson accessories, intended to all-
ow the set to be used in automobiles,
motorboats and in homes/farms not
wired for electricity. The first access-
ory was referred to as their 6V Type-B
eliminator, which connected the set to
a 6V storage battery. The second was
the 32V Type-B eliminator for connec-
tion to a 32V DC farm supply. In either
case, when the radio was so config-
ured Emerson recommended that the
117V line cord and plug be removed
(presumably by a service technician,
rather than it being cut off by the own-
er!). When no adaptor plug was ins-
erted the set would operate from the
117V AC/DC line (assuming the line
cord was still present!). Model 415 had
no accessory socket and operated
just from the 117V ac/dc line. The cir-
cular outline at the center-right of the
moulded rear panel in the photo below
shows where the adaptor socket is
located on the other models.

Models 415 and 420 (when operated
from 117V) used a resistance line cord
in the filament circuit, a change from
the earlier 20A/25A, which employed a
chassis mounted resistor (see my
25A
page). Emerson had acknowledged
heat build-up problems with the earlier
arrangement and thus introduced the
line cord as a means of removing the
heat source from within the very com-
pact cabinet.
...a handful of radio that works anywhere.
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Emerson Model 415 Bakelite Table Radio (1934)
Emerson Model 415 Bakelite Table Radio Rear View (1934)