$200.00 or Best Offer Unsold Seller: (665) 100%, Location: Williamsville, Vermont, Ships to: US, Item: 17 Highly collectible Heathkit CR-1 Crystal Radio Set with a set of Trimm headphones and copy of the manual. Both the radio and headphones work. I recently tested in Northampton, MA during the day and was able to pick up local WHMP-AM 1400 with just an antenna (no ground). Have not tried it at night recently. According to the previous owner the headphones are a later (and supposedly better) model than the ones originally supplied with the radio. I CANNOT verify this.
Please note that the previous owner etched initials into the back of the radio. Definitely not something I would do, but they are there.
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I am not sure what the discoloration is at the top middle of the radio. I have not tried to remove it for fear of hurting the radio. Update: I tried with a damp paper towel, it would not come off. PLEASE. Only bid on this set if you know about crystal radio technology. You will need an antenna and ground wire to work this radio.
You will not pick up stations without an antenna and ground. No battery or AC required. NO returns. Item works, but due to its age I cannot guarantee it. No guarantees or warranties of any kind. Being sold as is.
What you see is what you get. Shipping to lower 48 states only.
Will be shipped by USPS Priority Mail, insured. No alternate shipping methods, please. Thank you for viewing my auction! Please follow me for other radios that will be put up for sale. Condition: Used, Condition: Please see description, Brand: Heathkit, Model: CR-1, Supported Modes: AM See More.
$105.50 8 Bids 6d 2h, 14-Day Returns Seller: (1,498) 100%, Location: Montpelier, Vermont, Ships to: Worldwide, Item: 69 Auction is for the Heathkit CR-1 as pictured. I am selling it as parts or repair because with a short antenna and ground on it I didn't pick up any stations. It has seen use and is only average condition. There are scratches on the face plate and case and there is a nick or crack in one corner of the case as pictured. Headphones check good by testing for resistance and listening for the click.
Coil tests good for continuity and the crystal tests as it should. Switch looks good. There isn't much here which could go wrong and it shouldn't be very hard to make it play., Included with the radio are the phones and the original manual. I think the phones are the ones which came with it from Heath.
They are Trim ACME. Condition: Used, Country/Region of Manufacture: United States See More.
Links Heathkit CR-1 Crystal Radio and Miller 595 Tuner Information This page gives the circuit and pictoral description of the famous Heathkit CR-1 crystal radio. It was a double tuned crystal radio from the 1950's with a series tuned primary that had a 365 pf variable capacitor and selectable additional capacitance on the center selector switch.
In my opinion, it would have been more logical to have made the center switch for varying the inductance and using a tapped primary coil. Here is a picture of the inside of the original CR-1. Another photo showing the inside of the original Heathkit CR-1. Note the rectangular pinkish mica capacitors, the configuration of the central antenna switch, the 'cable knit' appearance of the coil windings, and the long screws holding the panel to the threaded stubs that are recessed deep into the cabinet. Anyway the coils, marked as 'transformer' in the diagram, were both wound on a ferrite rod and the secondary coil was part of a tank with the 365 cap and the germanium diode for the detector circuit. They do not give details of the coil construction but with a little experimentation you can get into the BC band tuning range. Here is the original circiut: This shows the pictoral diagram of the inside of the set: First Prototype In my first building project replica I used a toroidal core instead of a rod.
An Amidon FT 114-61 was my choice for the core, and 45 turns of 24 GA enamel wire for the secondary gets the detector tank in the ballpark. (Amidon's webpage is ).
I used 30 turns of the same wire would on the same toroid for the primary with taps at 3, 6, 9 15, 24, and 32 turns. I used the center selector switch to vary the inductance of the primary instead of switching in additional capacitors. The little box is a Radio Shack part #270-1805 that is just about exactly the same size as the original enclosure. The front panel is made of aluminum, so it serves as a common ground, but the antenna and one of the headphone binding posts need to be insulated from it using little fiber washers to prevent those binding posts from making electrical contact with the panel. The radio was originally sold either with or along side a pair of 4000 ohm Trimm Acme headphones.
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They were only middle of the road for sensitivity and a good old pair of Brandes Superior or Western Electric 509-W's would be much more sensitive. Here is a shot of the main parts on the floor. The rotary switch, diode, and box are from Radio Shack. The variable caps were obtained from the Xtal Set Society. The coil is described above and I got the old mica capacitors from my junk box.
I ended up using a different coil and no padder capacitors though. One challenge was to tap a couple of the holes on the front face of the variable caps to allow them to be mounted to the front panel using 6-32 screws. Care must be taken to avoid damaging the capacitor and to keep the metal shavings out of the ball bearing mechanism. OK, here is the completed CR-1 clone. This first attempt has the binding posts spaced a bit too close. I didn't have an original to copy, just pictures.
I also tried a couple of different coil configurations and the one I settled on has 45 turns of 24 GA wire for the tuned secondary, and the primary is tapped as noted above. Inside it is pretty simple. Just the 2 variable caps, the rotary switch wired up to the toroidal coil, and the diode can be seen from the capacitor to the binding post on the far left. I hooked it up and counted 6 local stations in the first minute in the daytime, and with a good pair of headphones got 7 locals and another 4 out of state stations on the first night. If I ever get a hold of an original, I will post a comparison of the performance. OK, I got a loan of the original Heathkit CR-1 and here is what I found.
The original CR-1 has a much more definite double tuned effect than my spinoff. The 2 knobs for tuning the ANT and DET circuits seem to track pretty closely with each other and both need to be tuned to the same frequency farily sharply to get reception. It is easy to miss a station by not having the tuners coordinated. I found it best to move the DET dial a little then sweep the ANT knob back and forth a little to zero in on the station if there was one there.
The circuit gurus emailed me and correctly predicted that my circuit would pretty much function as a single tuned circuit. The inductance tap switch mainly varied the selectivity and I found the 9 turn tap to be good for both sensitivity and selectivity.
There was some noticeable tuning effect of the ANT variable cap at the high frequency end of the dial but the DET tuner did most of the tuning. It was, however, very sensitive and tuned very sharply anyway. In fact the volume was louder across the entire frequency range than the on the original CR-1, and I was able to get a couple of weaker stations that I couldn't reach on the real CR-1.
So overall I am very happy with the performance but I will try another one to try and clone the coil and performance of the original a little more closely. Next Version After a lot of advice and many coils later, I think I got pretty close to the original performance. The secret is the coil.
I am told the original has 2 small ferrite cores in it rather than 1 long one so, I experimented with different sizes of cores combined with different numbers of turns on the coil and then zeroed in on the correct spacing between the 2 cores. The spacing between the coils could be measured from outside but the stuff inside the cardboard tube was impossible to discover without damaging the coil. It looks like the core is about 1/4 inch diameter and extends just to the outer edges of the coil windings when you look into the ends of the tube. If anyone knows the exact original specifications please let me know.
Anyway, I was able to pick up the same stations with this version as with the original. After many attempts and examination of an original coil and X-ray here is what I ended up with.
I used 21/44 Litz wire for the windings. The antenna coil was about 140 turns with a 9/16 inch slug inside that part for about 335 uH inductance. The space between the coils was 10 mm or about 7/16 inch.
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The detector coil had about 90 turns with a 9/16 inch long slug inside that and measured 240 uH. On some of the coils, I tried bringing out a tap about 30 turns from the stator end of the winding for the detector tap. Hard to say if this made and noticeable difference, not much if any. This coil seemed to duplicate the performance of the original in both sensitivity and selectivity. Any closer spacing of the coils and you get too much coupling and the tuning gets very broad. Here is a front label that I made on some thin acetate plastic, printed the Heathkit logo on it, and glued on to the front of the aluminum panel. I sold a few of these clearly presented as home made clones, though I have occasionally seen my radios show up for sale on Ebay advertised as a genuine Heathkit, which should be obvious that they are not.
Note the short flat Phillips head screws, the lettering which is clearly different than the original, and the coil inside is clearly hand wound as opposed to the tidy machine winding of the originals. Also note the round modern ceramic chip capacitors and the multiposition switch. If you run across one of my radios being passes off as an original, you can refer the seller to this page, but the radio itself, unless damaged, should work just as well as the real thing, and there were only a dozen or so ever made, so they are quite rare indeed! Addendum 5/29/01 Unravelling the secrets of the CR-1 coil, or The CR-1 coil Exposed This is an actual X-ray of a Heathkit CR-1 coil. As you see, it has the 2 coils each with its own separate ferrite slug. The best I can measure, each slug is about 13 mm or about 1/2 inch long by 1/4 inch diameter. The separation between the slugs is 7/16 inch.
It looks like the slug in the larger (antenna) coil is not quite centered under the coil. I am not sure if this was intentional or not. Anyway it was helpful to know how it was made so one might get a better idea of how to make a duplicate. The Amidon R61-025-400 core can be cut into the 1/2 inch lengths for use in constructing a coil like this one. I will post further information as I progress with this project. (sorry this linked site has been removed, but will try to relocate it) This is a link to a page with more information about another famous crystal radio, the Miller 565 / 595 Tuner.
This was my next project. The modified schematic is shown below.
This is an archive based on a page that used to be at It has been reassembled from my copy (saved when the site was live) together with files retrieved from and other resources. Hundreds of other files have been kindly contributed over the years too.
Many of the files here are just schematic diagrams but some include additional information such as specifications, and a few are complete manuals. 'Partial manuals' normally include everything apart from construction details. 595 files available. Click a row in the table below to download the file. You may download up to 5 different files in a 30 minute period. If you have anything to add please email paul (at) vintage-radio (dot) info. Title Description File Type Size.
Heathkit Cr 1 For Sale
$89.00 Buy It Now Sold, 30-Day Returns Seller: (9,899) 99.9%, Location: Middlesex, New Jersey, Ships to: Worldwide, Item: 82 Reproduction Heathkit CR-1 AM crystal radio kit. INTRODUCTORY PRICE!!! Relive your youth, and introduce the youth of today, to the fun and excitement of building a crystal radio! This reproduction kit is based on the classic Heathkit CR-1 crystal radio, built by many people. This item has been relisted with a 10 business day handling time, due to a temporay shortage of parts. Kit features a High Quality, glossy black fiberglass face plate, with silk screen printing. Kit includes all components to build the radio, including two, unused NOS (New Old Stock) variable air capacitors, and high quality Hammond enclosure.
The kit requires you to wind your own coil. Kit includes a coil form with dual slugs and litz wire.
Includes CD-R with detailed coil winding instructions. CD-R also includes schematic, the original manual is not included. Item ships by Priority Mail (due to weight), in a box. The seller makes no representation of any item(s) sold to be fit for a particular purpose and assumes no liability for its use or misuse.
It is assumed that the unit(s) will be installed and operated by qualified personnel. The purchaser agrees that the seller shall not be held responsible or liable for any injuries or damages, whether incidental or consequential, associated in any way with the item(s). Suara tokek youtube. Check out our other listings for more Radio, Electronic and other UNIQUE items! Note, only 2 banana jacks are shown in the photo, kit comes with four.
Style of components may vary. High Quality fiberglass front panel, graphics are sharper and clearer than in photo. Case is glossy black, it looks slightly washed out in photo.
Brand new Hammond enclosure, still in plastic wrap. CD-R with detailed coil winding instructions. See our other listings, for our EXCLUSIVE line of PC board kits Condition: New, Country/Region of Manufacture: Unknown, Brand: Pirate Pete Electronics See More.
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