This week the contractors came and started working on my new workshop. She is starting to look like a building. I was surprised how fast this came together. Now they will be off until the new year, however at least they got it started.
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I have wanted to build this little radio since I was a teen. It comes from Alfred P. Morgan's book The Boy's Second Book of Radio and Electronics. In the 1980's, you couldn't buy these parts for love or money. They were just not available. Even in these days of eBay and the internet, some of these items are still hard to come by. The loopstick and this particular transistor (CK722) are two of those items that are scarce. Not sure why the transistor is so hard to find, they made tons of them back in the 50's and early 60's, but when they come up on eBay, they tend to be pricy. Fortunately I managed to get a hold of a few. The Miller loopstick 6300 only comes up occasionally, and usually goes for $60 USD or more.
A year ago, I lucked out and got a bunch of these vintage aluminum battery holders which are perfect for this project as well. Now if I could only find the exact loopstick and a variable capacitor that looks like the one in the diagram. Some pictures of the inside of the RCA 151 Oscillograph that I picked up the other day. It is in remarkably good condition. Even the cloth covered wiring is in good shape. It is interesting how the CRT was upgraded to a larger size. Originally it would have housed a 1" diameter CRT, but they upgraded it with a larger 2" tube. This one even had the case cut with a torch to fit a metal cylinder to shield and house the larger CRT. Not badly done. A similar Cathode Ray Oscillograph is talked about in a Mr. Carlson's Lab video. The only real difference is that mine has an RCA label on it. GE, RCA and Westinghouse often made the same equipment with their own labels on it. |
AuthorCharles Baetsen holds a Bachelor and a Master's degree in Engineering Physics from McMaster University in Hamilton, Canada. Archives
February 2024
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