WELCOME TO THE CK722

CLASSIC GERMANIUM TRANSISTOR

WEBSITE AND MUSEUM

Three Distinctive Case

Styles Were Used

WE’RE WORKING NOW TO EXPAND THE CK722

WEBPAGE AND OPEN A NEW CK722 VIRTUAL MUSEUM.

UPDATE – SEE THE CK722 FEATURE ARTICLE

IN THE MARCH 2003 IEEE SPECTRUM MAGAZINE.

Use the Following Two Links To Visit Hundreds

of Pages of CK722 Material.

CK722 Museum

This site is an ever-expanding museum, dedicated to the CK722. We’ll be adding

material to the CK722 Museum as part of the 50^th anniversary, so check back often.

If you remember the CK722, then be sure to visit this new “virtual” museum,

with information about all types of early transistors.

NEW! TWO CK722 CONSTRUCTION PROJECTS!

USE THESE LINKS TO FIND DETAILS AND

BUILD YOUR OWN HISTORIC PROJECTS

A 50^th Anniversary CK722 Radio

All Construction Details and Photos

BLUE BLINKIE

BLUE LED/BLUE CK722 Flasher.

BLUE BLINKIE CK722

Please let me hear from you if you share my interest in the CK722

and other classic transistors from the 50s and 60s.

Did You Know That Blue and Silver CK722s Actually Contain a Complete Small Hearing Aid Transistor Inside?

Xray View of a CK722, Showing Internal Transistor

The CK722 Was Not Only A Hobbyist Transistor But Was

Also Used in Commercial Radios from the 1950s.

HERE ARE A FEW

CK722 FACTS:

The First CK722s Cost 12.00.

The CK722 Price Was $7.60 in February 1953.

The CK722 Was The First $1.00 Transistor (1956).

By the Early 1960s, Surplus CK722 Type Transistors Cost 10 for $1.00.

Thousands of Radio Kits Using the CK722 Were Made in the 1950s and 1960s. Did You Build One?

The CK722 Was the Most Popular Transistor Ever Made.