Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

4

Ou

S/O

Brevets

S/O

Description générale

PLASTIC AND METAL CONSTRUCTION

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

6,1 cm

Largeur

S/O

Hauteur

S/O

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Communications

Catégorie

Radio

Sous-catégorie

S/O

Fabricant

Ou

RAYTHEON

Pays

United States of America

État/province

Massachusetts

Ville

Newton

Contexte

Pays

Inconnu

État/province

Inconnu

Période

Inconnu

Canada

CK722 WAS 1ST TRANSISTOR SOLD TO GENERAL PUBLIC. IT IS A CONSUMER VERSION OF THE CK718, RAYTHEON'S FIRST JUNCTION TRANSISTOR, USED FOR AMPLIFICATION IN HEARING AIDS. IN THE 1950S MFG METHODS FOR SEMICONDUCTOR DEVICES WERE CRUDE, AND MANY TRANSISTORS FAILED QUALITY CONTROL TESTS. RATHER THAN DESTROYING CK718S THAT DID NOT MEET GAIN AND NOISE PERFORMANCE SPECS. FOR HEARING AIDS, RAYTHEON REBRANDED THEM FOR THE CONSUMER MARKET AS THE CK722 OR THE CK721. THE CK722 WAS MARKETED TO ELECTRONIC HOBBYISTS, WHO INCORPORATED IT IN HOMEMADE RADIO RECEIVERS, OSCILLATORS, SPEAKERPHONES & OTHER DEVICES. (REF. 2).

Fonction

ARE SEMICONDUCTOR PARTS

Technique

EXAMPLES OF VERY EARLY GERMANIUM JUNCTIONTRANSISTOR, WHICH WAS INVENTED BY WILLIAM SHOCKLEY IN 1951. CONSISTING OF 3 LAYERS OF DOPED SEMICONDUCTOR MATERIAL, IT PERFORMED THE SAME AMPLIFICATION AND OSCILLATION FUNCTIONS AS A VACUUM TUBE TRIODE. IN COMPARISON TO A VACUUM TUBE, THOUGH, THIS DEVICE WAS SMALL, CONSUMED MUCH LESS POWER, AND GENERATED MUCH LESS HEAT. (REF. 2).

Notes sur la région

Inconnu

Détails

Marques

'CK 722 Raytheon C-12' PRINTED ON CAP/ RED DOT APPEARS ON ONE SIDE OF CAP, NEAR BASE

Manque

NONE

Fini

BLACK CAPS HAVE CLEAR PLASTIC BASE/ 3 FINE SILVER WIRES EXTEND FROM BASE

Décoration

S/O