We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
68
RADIO BROADCAST ADVERTISER
The Type 405
General Radio-Raytheon
PLATE SUPPLY
Improved quality of reception, free from anxiety caused by steadily deteriorating "B" batteries, is now possible through the use of a General Radio — Raytheon Plate Supply.
This unit operates on no volt (60 cycle) A. C. and provides voltages of 45, 90, 130 and 200.
Voltages are readily adaptable to all popular makes and circuits of radio receivers by means of fixed resistances which are tightly sealed from dust and moisture, thus eliminating bothersome and noisy tendencies of variable resistance voltage controls. The voltage drops at the various taps per milliampere load are as follows :
Tap Open Circuit Rate of Drop per Milliampere 45 55 2.35 volts
90 132 3.50 "
130 205 3.00 "
200 260 1.80 "
The unit is contained in a metal case with attractive black crystalline finish, and has a conveniently located A. C. switch.
Type 405 Plate Supply, with BH Raytheon Tube $46.00
Ask your dealer to show and demonstrate this unit to you or write for our booklet containing complete information.
Price $46 Complete With Raytheon Tube GENERAL RADIO CO. Cambridge, Mass.
GENERAL
FARTS AND ACCESSORIES
NAT
0 N A L
POWER
TRANSFORMERS. SAFETY-SOCKETS, CONDENSER-BLOCKS, FOR RAYTHEON PLATE-SUPPLY UNITS
FILTER-CHOKES
9 These units, for RAYTHEON plate-supply construction, embody numerous features of value not previously found, which simplify and shorten wiring, improve appearance and increase safety of operation. «| The TRANSFORMER has taps for A.C. filament supply for both 5 and 7 volts with mid-connections. The windings are generous in size and will carry full load without heating. The 0.1 Mfd. buffer condensers are built into the transformer and no outside wiring is required for them. 4 Completely insulated high-tension leads are furnished to
the SAFETY SOCKET— a specially protected and cushioned unit. <i The CONDENSER BLOCK contains one 8, two 2 and two 1 Mfd. TOBE Filter Condensers and matches the transformer in shape and size. *I The FILTER-CHOKES are in a single small case and are carefully designed, for full impedance and wire size. 4 These units are made to NATIONAL standards. Anyone who has built a BROWNINGDRAKE knows what that means. Sena' for Bulletin BR. Be sure you get the genuine NATIONAL products.
NATIONAL COMPANY, INCORPORATED
W. A. Ready. Pres.— Engineers and Manufacturers— 110 Brookline Street. Cambridge. Him.
-A" Examined and approved by Radio Broadcast Vir