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-boun...@febo.com [mailto:time-nuts-boun...@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. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> __________ Information from ESET NOD32 Antivirus, version of virus >> signature database 5044 (20100420) __________ >> >> The message was checked by ESET NOD32 Antivirus. >> >> http://www.eset.com >> >> >> >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.