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!

General Electric Models G-105 and G-106
Radio Service Data Sheet
December 1938 Radio-Craft

December 1938 Radio-Craft

December 1938 Radio Craft Cover - RF Cafe[Table of Contents]

People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.

General electric G-106 Vintage Radio (raddiomuseum.org) - RF CafeGeneral Electric engineers were really thinking 'outside of the box' when designing the 1938-vintage Model G-106 console radio. In addition to its stylish wooden cabinet, the 13-station, piano-keyboard-like 'Touch-Tuning' tuning scheme employed a motor-driven variable resonant tank circuit. No doubt the sound of a motor spinning inside was a major selling point for hooking techno-audiophiles of the era. There are some good photos of a restored GE Model G-106 console radio on the RadioMuseum.org website that includes details of the tuning mechanism.

General Electric Models G-105 and G-106

General Electric Model G-106·receiver featuring automatic program selection, Beam-a-Scope antenna, and touch-tuning. The pushbuttons are in the form of piano keys.

10-Tube Superhet.; 3-Bands (540-1,575 kc.; 1,575-5,700 kc.; 5,700-18,000 kc.); "Beam-a-Scope" built-in antenna; 13-Station Touch­Tuning System; Push-Pull Output; A.V.C.; Power Output (max.) 13 W.; Automatic (time clock) Program Selection (Model G-106 only)

Alignment Procedure. I.F. Alignment with Oscilloscope

Condenser gang at minimum capacity vertical input to ground and junction at R-25, R-12, and R-17. Adjust trimmers in order mentioned for a single . curve of maximum amplitude. . The resulting curve on the "Normal" position is shown in Fig. 2A. The expanded curve taken with tone control at "Treble 1" is shown in Fig. 2B.

Alignment Procedure. I.F. Alignment with Meter

Condenser gang at minimum capacity- output meter connected across voice coil volume control at maximum input as low as practical.

Mechanically adjust dial pointer to first line at left-hand end of dial scale with condenser gang fully meshed.

Connect output meter across voice coil - antenna switch turned to counter­clockwise position.

Adjust; trimmers in order listed for maximum-output.

Adjust padder for maximum output in vicinity of 580 K.C. while rocking gang condenser.

Touch-Tuning

Figure 1 shows a simplified schematic of the control circuit and the following cycle of operation may be traced very easily. When a key is depressed. it completes the 23-volt circuit through the button making contact with the contact segment (CT) and energizes one winding of the motor. The other winding on the motor is energized through the condenser C51. The direction of rotation of the motor is dependent upon whichever half of the contact segment (CT) that the station button first energizes. When voltage is applied to the motor, the rotor is pulled further into motor field. and engages its rubber cone hub with the dial drive wheel which in turn rotates the gang condenser and contact segment (CT). This operation continues until the insulated segment (1) breaks the station button circuit to the contact segment and removes voltage from the motor. The inertia in the tuning system drives the insulated segment past the station button and makes contact with the other half of the contact segment. This ener­gizes the other winding of the motor and causes the motor to reverse. The brake on the dial drive wheel· does not allow the tuning

 

 

Posted May 17, 2017

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 187 Radio Service Data Sheets as of May 2, 2017.

RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
RF Cascade Workbook

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ 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 !