Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

Ken-Rad Radio Tube Advertisement
April 1947 Radio News Article

April 1947 Radio News

April 1947 Radio & Television News Cover - RF Cafe[Table of Contents]

These articles are scanned and OCRed from old editions of the Radio & Television News magazine. Here is a list of the Radio & Television News articles I have already posted. All copyrights are hereby acknowledged.

Achieving what we consider relatively simple results with electronics indicators used to be cutting edge technology. This 6AL7-GT Electron-Ray Indicator Tube by Ken-Rad (a division of General Electric) provided a dual-channel electrofluorescent (i.e., cathode ray) display of relative signal strength or tuning the new-fangled FM radio stations. The tube could also be used, of course, for many other applications where Duracell PowerCheck - RF Cafesignal strength from any measured process: fuel level, voltage, temperature, stock price, phase angle, sound volume, speed, etc. Today, we have electrochemical indicators so cheap that they are built into off-the-shelf batteries at WalMart.

Ken-Rad Radio Tube Advertisement

More Accurate FM-AM Receiver Tuning by Means of Ken-Rad's Revolutionary New Tube!

The 6AL7-GT Electron-Ray Indicator Tube

Ken-Rad Radio Tube Advertisement, April 1947 Radio News - RF CafeGeneral Electric research, plus Ken-Rad development work, are responsible for the brilliant new 6AL7-GT indicator tube - most modern step in the direction of fast, accurate receiver tuning, FM and AM.

An electron-ray tube, twin light patterns appear on a fluorescent screen at the end of the glass bulb. These take the form of green bands which vary in depth according to changing voltages brought about in the process of tuning.

Extremely close FM, discriminator tuning may be accomplished by matching depths of the 6AL7-GT's light patterns. How the patterns appear to the eye under various off-channel, on-channel, off-tune, and on-tune conditions, is diagrammed below. Three FM circuit applications are shown, A fourth - AM - illustrates how avc voltage may be used for tuning purposes by checking the depth of the two light patterns working as a unit.

Easy to see and read ... Previous indicator tubes, developed for AM, have had reflecting targets, giving poor visibility because cathode and deflecting plates were placed in front of the screen, making it necessary to mask out the center. The fluorescent screen of the new Ken-Rad FM-AM 6AL7-GT is transparent, with electron-ray mechanism located behind, not before the image, thus offering no obstacle to vision.

Ken-Rad is consistently ahead with new tube developments - meaning that Ken-Rad dealers, and servicemen installing Ken-Rad tubes, march in the van of radio progress. Pioneering work by Ken-Rad, as typified by this great new 6AL7-GT indicator tube, enables you to serve all your clients better, whether their radio sets be AM or FM, old-style or new, portables or console models ... Install Ken-Rad tubes for greater owner satisfaction, and resulting bigger profits!

Ken-Rad's outstanding new indicator tube will be on view at the Chicago Parts Show, May 13 through 16. See how it tunes circuits to hairline accuracy with ease and precision! Your visit to the Ken-Rad display will be one f the highlights of your Chicago trip. A cordial welcome awaits you!

Typical Operating Conditions
(indicator service)

Heater voltage 6.3 v

Heater current 0.150 amp

Target voltage 315 v

Voltage, deflection electrodes 1, 2 and 3    0 v

Cathode resistor (approx) 3,300 ohms

Deflector sensitivity (approx) 1.0 mm/v

Fluorescence cut-off, grid volts (approx) -6.0 v

Cutaway view of a Ken-Rad 6AL7-GT, showing screen target, grid, electron-ray deflectors, etc.

The 6AL7-GT's principle of operation is unique and effective. In the cutaway drawing at the right, note that the three deflection electrodes are close to the cathode, with this whole assembly in turn separated from the target by the grid. The latter operates either at cathode potential, or at a few volts negative with respect to the cathode. Because electrons move slowly in the area between cathode and grid, the 6AL7-GT's deflectors easily control the position of the electron beams on the target. Increasing the negative voltage on the grid slows down the electrons still more, augmenting their response to the deflectors' pull and thus heightening the tube's sensitivity.

More detailed technical information and performance data on the 6AL7-GT will be furnished promptly on request. If you manufacture electronic equipment, Ken-Rad tube engineers gladly will work with you to apply the new Indicator Tube to radio receivers or test equipment you may have on your drawing-boards. Communicate direct with Ken-Rad at the address below.

Behind Ken-Rad radio tubes stands Electronics' first and greatest name - General Electric

Ken-Rad
Division of General Electric Company
Schenectady, New York

 

 

Posted November 25, 2016

RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
RF Cascade Workbook

Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel
RF & EE Symbols Word
RF Stencils for Visio

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !