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14
RADIO BROADCAST ADVERTISER
MWGMMO
Mica Condensers
sizes
IMPROVE TONE RANGE
AND
VOLUME
IT is accuracy, not luck, that makes one receiver sweeter and more powerful than another that is almost its twin. Especially condenser accuracy, for the closer you come to absolute accuracy at these critical parts, the more wonderful your receiver will be. The cost of accurate condensers is small — the effect is immense.
Now you can get Sangamo Mica Condensers in capacities in between the usual stock sizes, so you can build with greater accuracy than ever before. They are guaranteed to be accurate and they always stay accurate, being solidly molded in bakelite. Neither heat, cold, moisture, pressure nor acid fumes will affect their capacity, because bakelite seals the delicate parts against all outside influences.
Capacities in microfarads and prices 0.00004 0.00005 0.00006 0.00007 0.00008 0.0001 0.00012 0.00015 0.000175
0.0002 / 4oc0.00025 0.0003 0.0003 5 0.0004 0.0005 0.0006 0.0007 0.0008
With Resistor clips, 10c. extra
Also Sangamo By-Pass Condensers i/iomfd. 80c. 1/2 mfd. 90c.
1/4 mfd. 80c. 1 mfd. $1.25
Sangamo Electric Company
6332-1 Springfield, Illinois
RADIO DIVISION, 50 Church Street, New York
SALES OFFICES— PRINCIPAL CITIES
For Canada — Sancamo Electric Co. of Canada, Ltd. Toronto. For Europe— British Sancamo Co., Ponders End, Middlesex, Eng. For Far East — Ashida Engineering Co., Osaka, Japan.
O.OOI
)
O.OOI2
0.0015
0.00175
50C.
0.002
0.0025 J
0.003
0.0035
> 60C.
0.004
0.005
70C.
0.006
8SC.
0.007
90C.
0.0075
95C
0.008
$1.00
O.OI
LIS
O.OI2
1.20
0.015
I-2S
METERS
for RADIO *
The HOYT "SUPER" Control Meter is a 2-inch Type 17, moving coil voltmeter, 0-6 volts, marked in red at 3 volts, and fitted with 3-foot silk covered cord-tips for plugging into the tip-jacks on Radiolas Nos. 20, 25 and 28, and all other similar sets with tip-jacks in the filament circuits. Permits exact adjustment of proper filament brightness. Improves reception and insures maximum life of the tubes. It may be placed anywhere on or near set. In polished mahogany case with non-scratch base.
Price, $8.50
CATCHING TRAINS WITH SUN DIALS
If you were going on an important journey, you would certainly use an accurate watch or clock to make sure of catching the train. You would not rely on a guess, based on the position of the sun or a glance at a garden sun dial. Yet this is exactly equivalent to trying to operate a Radio set by judging
the brightness of the filaments. In dry cell sets especially you cannot operate the filaments at the proper voltage, for maximum efficiency and for reasonable tube life, without using a filament voltmeter. The HOYT UNIVERSAL "TIPIN" Meter is designed for this purpose.
HOYT makes a complete line of meters for Radio. Send for calalogue" HOYT Meiers for Radio."
BURTON-ROGERS COMPANY
Boston, Mass.
Sales Department for Hoyt Electrical Instruments
Goodrich
Silvertown
f
The Radio Panel Supreme!
1 Easier to drill and machine.
2 Better color, lasting lustre.
3 Lower free sulphur — no discoloration.
4 Higher softening point — no warping.
Cjoodrich V. T. Sockets Spaghetti Tubing
Radiophone Ear Cushions Battery Mats -jt Hard Rubber Tubes for Qoils
The B. F. Goodrich Rubber Company
Established 1870 Akron, Ohio
tAt Examined and approved by Radio Broadcast