![]() ![]() Without the need to heat a cathode, my radio needs only a single 9 volt battery. Geezerola is just a silly name I chose, you can call your radio anything you want This little radio is functionally identical to Armstrong's and my triode tube radios except, unlike triode vacuum tubes, the crystal in my triode will pass electrons without heating the cathode. Both this and Armstrong's radio need an 'A' battery and a 'B' battery. ![]() ![]() My regenerative radio from There is a link to my regenerative radio here and at the end of this story. The specified tube socket and the exact coil form were both unavailable, but half the fun of building this radio came from the opportunity to improvise like using a toilet roll for a coil form and to invent construction techniques that matched my building skills. Of course, I did not have the skill and tools to build the radio as it was described. I was very lucky because the 1H4 tube the project required was still available, otherwise the project might have ended right there. I had built and experimented with crystal radios before, but I was ready to move up to something better. One project that really caught my fancy was the Armstrong Regenerative radio. Still, the book contained a lot of good, solid basic stuff and several wonderful projects that a kid could build and learn while doing. Morgan and his "Boy Electrician" book went back a long way, with the first edition printed in By the time I got this book, aroundthe technology in it was already 20 to 50 years old. Visible toward the top left is the brass knurled knob for the antenna connection.Back in the late 50s and early 60s my nascent career in electronics was encouraged by the many wonderful construction articles in Popular Electronics, Popular mechanics and Popular Science magazines, but it was a edition of an old book I found in the City Library that really got me going. Barely visible at the bottom left and center are blue wires emerging from holes in the wood where they are soldered to the variable capacitor and the transformer. Note the red and black ink on the square tubing, marking the best slider positions. Note that the insulation has been removed from the 16 guage wire along the paths of the four sliders. It uses square brass tubing with a strip of sheet brass soldered to it. The knurled nut bears down on a brass washer with its underside soldered to a hex nut. These are made of brass screws and big knurled nuts. This view shows the antenna and ground binding posts at the back edge. Wire emerges through small holes on the back sides of the variable capacitors and transformer. All other wiring is on the underside of the wood base. The wires to the slider bars run down internally through the wood supports. Sorry, I don't recall how many turns, but don't worry, it's not critical. It was wound as one long coil, then cut in the middle. The tube is a 12 inch section of 2" PVC pipe. It also helped me get close to my design goal of perfect symmetry. I've seen enough of those I decided to try something that looked truly wireless. Crystal radios are so simple, they are often built with exposed wiring. If you have anything to add please email paul (at) vintage-radio (dot) info.Crystal Radio enthusiasts will note the striking absence of wiring. #Heathkit cr 1 crystal radio manual download#You may download up to 10 different files in a 30 minute period. Click a row in the table below to download the file. "Partial manuals" normally include everything apart from construction details.Ħ99 files available. Many of the files here are just schematic diagrams but some include additional information such as specifications, and a few are complete manuals. Hundreds of other files have been kindly contributed over the years too. It has been reassembled from my copy (saved when the site was live) together with files retrieved from and other resources. #Heathkit cr 1 crystal radio manual archive#This is an archive based on a page that used to be at. ![]()
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