[time-nuts] And you thought you were old

J. Forster jfor at quik.com
Tue Apr 20 11:02:48 EDT 2010


In some ways, "hardly looking" is a real tribute.

In science, the mark of a really successful theory is that it becomes
"part of the furniture" like Ohms Law, Keplers' Laws, Newtons' Laws, etc.

-John

=================



> I still have an original booklet from raytheon : how to build a 1
> transistor radio with a CK722.
>
> However, my very first transistor first transistor was an OC70 from Valvo
> (German Philips). I bought it about 1956 ,I was 13 years old then in
> Stuttgart Germany.
>
> It cost me 10.20 German Marks. A substancial sum then.   I  soldered the
> transistor in to a socket , so the leads would not break off.
> I build many different projects with it then.
>
> Now when I see one of the old black Philips  glass encapulated
> transistors, I get quite nostalgic.
> But this days one hardly looks at a modern transisitor anymore.
>
>
>
>
> On 21/04/2010 12:19 AM, Mike Feher wrote:
>> In fact, one of the first CK-722s that I took apart did have a smaller
>> hearing aid type transistor inside. Later CK-722s were of course built
>> as
>> CK-722s and even later they were in black but somewhat clear epoxy
>> cases. -
>> 73 - Mike
>>
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>>
>>
>>
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of J. Forster
>> Sent: Tuesday, April 20, 2010 9:57 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] And you thought you were old
>>
>> Do you know the story of the CK722?
>>
>> In the 1950s, Raytheon was making tiny transistors for hearing aids to
>> replace the pre-WW II subminiature tubes.
>>
>> Aside: Those tubes, developed by Norm Krim, were ruggedized and used in
>> the WW II Proximity Fuzes, one of THE big inventions of WW II.
>>
>> Anyway, Raytheon was making piles of these tiny transistors, but many
>> were
>> not making hearing aid specs. Norm got the idea of packaging them to
>> sell
>> to hams to learn about transistors. If you open up one of the blue ones,
>> there is another tiny case inside which is the real transistor.
>>
>> BTW, Norm is still alive and well in his 90s.
>>
>> -John
>>
>> ===============
>>
> Anyone remember the CK722 transistor? As I remember they were about $7.50,
>>> a
>>> considerable sum.
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