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The Eveready "30" Receivers
The Eveready "Model 34" Console.
The National Carbon Co.'s line of Eveready receivers presents the same chassis,
the "Model 30," in a choice of consoles. The receiver, a R.F.L. design. has variometer
tuning in the antenna circuit, and six stages, using four 27s and push-pull '71s.
All console models have the Eveready dynamic reproducer built in.
Silver A.C. Short-Wave "735"
Chassis of the "Round-the-World Six," a 17 to 650 meter factory assembled receiver.
This receiver is designed to take short-wave reception off the breadboard and
into the parlor. Its circuit is similar to that of the D.C. "735" which is also
available; the latter uses one '22 in an untuned R. F. stage, and four 12As. The
A.C. model uses a '24 with its superior characteristics in the first stage, and
has a '45 push-pull output. The audio channel and power unit are the same as in
the "Model 722" - "Band Selector Seven". The "735" A.C. model lists at $64.90, factory
assembled. without cabinet or long wave plug-in coils.
Set Tester And Checker
The Weston "Model 533" Counter Checker.
Thirteen ranges are combined in the new Weston "Model 547" Set Tester, which
measures both A.C. and D.C. voltages up to 750, by means of its two selector switches.
Three 3 1/4-inch meters are incorporated in the panel. The instrument, with the
necessary tools and testing accessories, weighs ten pounds and fits in a carrying
case 12 3/8 x 9 x 3 3/4 inches. Its net (dealer's) price is $93.75.
The counter rube checker is adapted for oper-ation from any standard A.C. lighting
circuit, with considerable tolerance of input voltages; and is designed to test
quickly all the latest A.C. as well as D.C. rubes for their character-istics.
Brandes And Kolster Remote Tuners
The Brandes "Model B15," with its selector tuner above. The Kolster and Brandes
receivers of this season incorporate a new method of automatically-selective tuning.
The Kolster "K-45" has no knobs or dials on the front; its dial may be seen through
a small window in the top. and the tuning buttons are on the side. In addition.
there is a remote-control box, led by a cable to the set, which has six buttons
for as many stations, volume control, switch and pilot lights. The list price of
this de luxe set is $500; other models range down to $200.
Above, the remote-control tuning box of the Kolsrer "K-45;" at the left, the
automatic selector built into the set itself.
By modern house-wiring methods, any room can be equipped with a receptacle, thus
allowing a convenient disposition of the tuning box wherever desired.
The Brandes brings the selector tuning system into a lower price range. This
line has also four tuned circuits and '45 push-pull amplification. The "Model B-15"
illustrated lists for $125.50; the line covers the field from $85 to $165.
De Forest Audions
 In the line of new tubes presented by the
de Forest Radio Co., an improved heater design has been incorporated to reduce the
hum of the A. C. filament current. The heaters now used are made of "crolite," a
new synthetic ceramic; and the filament is completely shielded from the cathode.
In the 410 power tube, as in the new D.C. screen-grid audion (the 422), oxide-coated
filaments are used to give longer life than with the thoriared-tungsten commonly
used. In the new 424, the A. C. screen-grid audion, other characteristics have been
retained, but the grid bias has been doubled.
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Crosley Monotrad
The Crosley "Monotrad" in a table-type metal cabinet, designed to take the speaker
as shown or on top.
In the Crosley line of mass-production price receivers, the newest arrival is
the Monotrad, a seven-tube A.C. screen-grid receiver, listing at $62 without accessories.
Its chassis, illustrated below, has the new Crosley triple-range control, a completely-shielded
gang condenser carbon-type amplification control and Mershon condenser. It is intended
for use in any of the many cabinets designed for the Crosley line.
The chassis of the Crosley "Monotrad."
Majestic Receiver Models
The post-colonial console design of the "Model 181."
The Majestic line incorporates, in its "Models 91 and 92," the latest type of
power detection. These receivers, with built-in super-dynamic reproducers, list
at $137.50 and $167.50.
The "Model 181," illustrated above, is a striking accomplishment in cabinet work,
and reproduces either radio or phonograph records through a '50 push-pull amplifier.
List, $316.50.
Zenith Remote-Tuner System
The Zenith "50 Screen-Grid" Chassis (above) and Automatic Tuner (below, right).
 The newest Zenith designs Incorporate
the "Model 50" chassis, with its five tuned R.F. circuits, and two push-pull audio
stages, with '45 output. All embody the Zenith automatic tuning system, to which
has just been added (in the "Model 55") the remote tuner illustrated. This operates
at the turn of a button, its pilot light automatically indicating the station which
is on; and gives also volume control. The set operates a 12·inch dynamic reproducer.
The "Model 55" is priced at $700 in its Italian Renaissance cabinet; others down
to $175.
Champion Radio Tubes
 A new method of merchandising of interest
to buyers, as well as sellers, is utilized in the packing of Champion tubes. Not
only is there the new system of packing the complete tube equipment for a given
receiver in one carton; but the individual tube is in a stout container of a design
which permits a demonstration test of its characteristics without removing it or
breaking the seal by means of a test adapter furnished by the manufacturers.
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Hammarlund Amplifying Units and Transformers
The Harnmarlund Manufacturing Co. has just added to its extensive list of radio
components several important units; among them a three-stage R.F. band-selector,
known as "BS-3," to work ahead of an amplifier; a three-stage screen-grid R.F. amplifier,
"RF-3," to follow the former; a shielded, polarized R.F. choke, SPC, and a family
of audio-frequency transformers.
The band filter comprises a three-gang "Midline" condenser and matched filter
coils; this affords pure 10-kc. selectivity ahead of the amplification. The amplifier
also contains a three-gang condenser and matched, shielded coils. Both units are
factory assembled and sealed.
In front, the "Battleship" condenser of the band filter; behind it, the coils
in their shields.
The first-stage A.F. transformer, "AF-2," has a ratio of 1 1/2-1; the push-pull
input type, "AF·4," 2-1 on each side. Both have very large primaries, and cores
of special-alloy laminations to insure a flat characteristic. The output transformer
types are "AF-M" for magnetic reproducers and "AF-D" for dynamics.
A complete power supply unit, "PS-45," is designed to operate a receiver with
push-pull '45 amplification. It comprises two heavy chokes and a power transformer
with primary tapped at 80 volts for use with an automatic voltage regulator. The
high-voltage secondary is a center-tapped 750-volt winding with a rating of 100
milliamperes; and there are a 5·volt and two 2 1/2·volt windings. The new voltage
divider is "RHQ-30" and the condenser block "CHQ-30."
The new A.F. transformer in its steel housing for sub-base mounting.
Jewell "581" Test Panel
The Jewell Electrical Instrument Co. has designed a laboratory panel, suitable
for shop or jobber's use, to facilitate complete testing of receivers and other
radio apparatus in the shortest time. It is furnished with high-resistance precision
meters and gives in addition to tube readings, condenser capacities and high-voltage
secondary readings. Dealer's price $159; with work bench, $208.87.
Readings of the seven large (5 inch) meters of the Jewell Test Panel are visible
at a glance. It is a time-saver; and time is money, even in the radio business.
There is a tube socket at the lower right for testing rubes apart from a set.
"General" Wood Cabinets
The increasing vogue of individuality, in cabinets to take standard receiver
chasses, has promoted the production of many very artistic designs. The Wood Cabinet
Corporation presents a line, of which the "Model 108" is illustrated; it is designed
to accommodate any popular set, with speaker above.
An attractive and somewhat modernistic piece of cabinet work.
Best Electric Motor Chassis
The "BBL" electric motor, designed for small-cone reproducers, incorporates a
tapped winding with a switch, which matches the output impedance of the receiver
without resorting to a special transformer, as well as a separate volume control.
It is now available in a separate cabinet, at $35 list, as well as in chassis form
at $22.50.
The magnetic reproducer unit of the "BBL" motor will drive a 12-inch fixed-edge
diaphragm.
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