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.RADIO BROADCAST ADVERTISER.
XT
CELOTEX
baffle boards will not vibrate at any audible frequency or produce any resonant effects.
Celotex will also prevent reflection of sound waves.
12 x 12 inches. . 18 x 18 inches. . 24 x 24 inches . . 36 x 36 inches . .
$1.00 4 x 4 feet . . $7.50
. 2.00 6 x 3 feet 9.00
. 3.00 6 x 4 feet 12.00
. 4.50 8 x 4 feet 15.00
Holes cut according to specification At your jobbers or write to
THE BAFFLE BOARD CO.
624 Madison Avenue New York, N. Y.
Has Your Set "ADENOIDS"?
It can be easily corrected. All it needs is an "adenoid" operation. Simply take out the trouble-causing inferior transformers and replace them with one of the AmerTran audio systems. It will make your old set as modern as any set regardless of price.
See your dealer today
AmeiOhan
AMERICAN TRANSFORMER CO. 92 Emmet St. Newark, N. J.
Transformer Manufacturers For More Than 29 Tears
-Not an Extra &
There is no choice. You must <<* <JT j^v use Amperite to automatically
control variations in the "A" <?&t^&hP"-&* ' current supply to your tubes. NT
A type for every tube A. C.
or D. C. $1.10 with mounting (in U. S. A.) at all dealers.
-^tk&ftiaU Gompany?
Write Dept. RBi
This symbol in a radio diagram means —
FREE -"Amperite Blue Book" of modern circuits and valuable construction data •
"SELF-ADJUSTING " Rheostat
HELPFUL TECHNICAL INFORMATION
A regular feature of Radio Broadcast is the series of Laboratory Information Sheets, which cover a wide range of information of immediate value to every radio worker, presented in a form making it easy to preserve them. To insure your having every issue, send your check for $4.00 for one year's subscription to
Subscription Department Doubleday, Doran & Company, Inc. Garden City, N. Y.
ROBERT S. KRUSE
Consultant and Technical Writer
103 Meadowbrook Road, West Hartford, Conn. Telephone Hartford 45327
PLUG in a Falck Claroceptor between wall socket and radio set and eliminate "static'' from motors, street cars, telephones and electrical appliances. This new improvement by a pioneer radio parts manufacturer grounds and thus blocks out line interference noise and radio frequency disturbances. Also improves selectivity and distance. Requires no changes in set. Measures just 3^4 x Sl/2 x 2y2 inches. Thousands now all over America use the Claroceptor for clearer A. C. reception. Get one right away — at radio parts dealers. Write for descriptive folder.
$7.50 complete with cord and plug
CLAROCEPTOR
Built by ADVANCE ELECTRIC CO.
1260 W. Sscond St. Los Angeles, Calif.
JOBBERS and DEALERS, GET OUR PROPOSITION
HOOK-UP WIRE
The 5raid Slides Back*
At All Dealers
25 Feet Stranded 35c
25 Feet Solid 30c
Red, Green, Yellow, Blue, Black
PDprp Send us the name and address of your dealer * "Eid anc] we w;[[ send you a sample package of Braidite FREE. Include ioc for postage.
CORNISH WIRE CO.
38 Church Street New York City > 0 g P Q.QJ2JUL) .
FOR every radio need, in brushed brass or Bakelite. Fit standard electrical switch or outlet box. Single plates and in gang in many combinations.
No. 135— For Loud Speaker gl.OO
No. 136— For Aerial and Ground 1.00
No. 137 — For Battery Connections 2.50
No. 138 — For A C Connections 1.00
(Bakelite, 25c additional per plate)
At Your Jobber's
YAXLEY MFG. CO.
Dept. B, 9 So. Clinton St., Chicago, 111.
Engineers
that are competent now have a new big profitable field before them —
We invite you to write us for information that will help you to capitalize on your experience and knowledge by installing —
aMPLIOn
Public Address Systems
We have ready for quick installation group address equipment for both indoors and out for such places as Hotels, Theatres, Factories, Auditoriums, Clubs, Hospitals, Race Tracks, Railroad Depots, County Fairs, Summer Resorts, etc. Let our engineers help you make more money in this new field of amplification requiring special radio equipment. Briefly speaking we have established something new —
A FREE Service Station
for Radio Engineers
and that is just what it is — a -well organized department of our business just to help you. We make no charge for this service it is freely given with Amplion's compliments and a background of 42 years of success in the acoustic field.
We Have Ready For Immediate Delivery
SPEAKERS
9" Cone Chassis (9^x9^4x7) ^1 5.50
14" Cone Chassis (24^x8^x19^) .. 16.50 16" Cone Chassis (26^x10x22) 17.00
UNITS— balanced armature (4x4x3) .... 8.00
A. C. 100 — Giant Dynamic Air Column
Unit (weight 25 lbs.) (10x8x8) 150.00
Exciter for A. C. 100 unit (field current
supply) (8x11x6) 30.00
STEP-DOWN TRANSFORMERS
type .06 (5x6/2x7^) 20.00
type .07 (3x3x3J4) 10.00
HORNS
42" Trumpet (22" bell) (24x24x44).. 25.00
72" Trumpet (74x32x32) 56.00
10 ft. Air Column (60x37x46) 200.00
12Y2 ft. Column (34x48x33) 100.00
15 ft. Air Column (57x57x35) 250.00
MICROPHONE (9^x9^x7) 100.00
MICROPHONE TRANSFORMER
(3x3x3^) 18.00
AMPLIFIERS
2 stage (210 tubes in P.P. in last stage) (17x14x9) 125.00
3 Stage (250 tubes in P.P. in last stage) (22x17x9) 175.00
MICROPHONE INPUT AMPLIFIER
A. C. (14x15x9) 110.00
MICROPHONE INPUT AMPLIFIFR A. C. (15x17x9) 120.00
Amplion Cabinets for Moving Pictures
Cabinets contain 2 turntable electric motors. Amplion electric pick-up and control board for fading one piece of music into another, or making instantaneous switches.
P.M.S. 2 std. (30x40x46) $300.00
P.M.S. portable (12x32x22) 225.00
Phone Record Library
200 Record (14x14x30) £200.00
250 Record (14x14x30) 250.00
Especially designed for Non-Synchronous Moving Pictures.
We furnish the complete installation or any part of the equipment as desired.
Write for profitable Amplion proposition to competent Engineers
AMPLION CORP. OF AMERICA
133 W. 21st. Street
New York
The Sign of Enduring Quality
• april, 1929 . . . page 413 •