Radio broadcast .. (1922-30)

Record Details:

Title:
Radio broadcast ..
Date:
1922-30
Publisher:
Garden City, N.Y., Doubleday, Page & company [etc.]
Volume:
Radio broadcast ..
Leaf #:
000132
Language:
English
Collection:
Broadcasting & Recorded Sound
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Radio Broadcast supported home listeners of the new technology of radio – for building or buying a receiving set to explaining the technology used by the new radio stations. Throughout the magazine shows the cultural influence of radio as it evolved from hobbyist to mainstream. -- David Pierce, 2011
Date Added:
July 19, 2022
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RADIO BROADCAST ADVERTISER 145 /K4 T-/0A/A L/A '"- --SO, E. FILTER TTtR TONE I . *^^s$jg* \m mn -^•HE ORIGIN,^ U^\EH«V • | f I m'^i \J 7180—A "B" That's Built for Service A Strictly Heavy-Duty Power-Unit Supplying Detector Voltages 22 to 45 adjustable R. F. Voltages - 50 to 75 adjustable A. F. Voltages - 90 to 135 adjustable Power Tube Voltage - 180 - fixed Protects Tubes, Condensers against excessive and harmful volt- ages. Designed for lasting service with liberal factors of safety. NATIONAL POWER TRANSFORMERS and FILTER CHOKES for AMPLIFIERS Specified generally. Transformer Type R, center tapped 600 v. secondary. Price $12.50. Transformer Type U, both 600 and 460 v. secondary $14.50. NATIONAL FILTER CHOKES • per pair in heavy case - Type 80, $10.00. Rating OutputRating is vomils at 180 volts. Uses R. C. A. UX 280 or Cunning- ham CX 380 Rectifying Tube. Licensed Under Patents of Radio Corporation of America and As- sociated Companies. For IIO-I2O volts, 50-60 cycles A. C. only. List Price with Cord, Switch and Plug $40.00. Rectifier Tube $5.00 Write National Co. Inc.. W. 4. Seady Prei Maiden, Mass., f or new Bulletin 124 *v«»a,o*5 SR ^ i NATIONAL TUNING UNITS — THE HEAVENLY TWINS More National Tuning Units have been used by set builders than all other similar components combined. Standard sincej 1923 A ff ,,,,i B, The; OFFICIAL Design-, BROWNING & DRAKE