I’ve acquired an old Ratheon CK722 transistor several years ago. I knew it was a find when I got it, but then it sat, stored away, for many years. Today I took some pictures of it and here they are. If you have never seen one of these beauties, they are royal blue with a red dot on them. It has a date code on it that says “542″ That means it was built in 1955 in the 42nd week.
The inside of the package has the strangest disclaimer. It reads “The purchaser or lesee of this device shall not be granted by implication, estoppal or otherwise any license under the patent rightsof American Telephoneand Telegraph Company andits subsidiaries for any combination of another element orelements with such device.”
The CK722 started out costing more than $12.00 to purchase and later went down to $7.50. WOW! I have no idea what that is at the current rate, but it is expensive. I could not find the current price of one of these gems.
Click a picture to see a larger view.
John
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February 2nd, 2010 at 1:00 pm
Thankyou for this trip down memory lane. This is the first transistor that I ever bought, the “see-kay-seven-two-two” and other than the 2n3904 and 2n3?55 its the only part number I recall. I’ve used hundreds of 2n3904s and 3906s during my lifetime.
73, Rod VA3ROD
April 26th, 2011 at 6:41 pm
I purchased some of these in the middle 1950s. I paid only a dollar a piece for them from a military surpluse store in Hessville or Hamond Indiana. Still, a dollar in those days was quite a bit. I think I still have a few of them laying around somewhere.
Bill N9JTR