NOS, Collectible, Historic, Military Grade 1N21 & 1N70 Crystal Units (Diodes)

Description: For sale is your choice(s) of historic, collectible military-grade diodes, left behind in the radio electronics inventory of my late father. He was an active HAM radio operator for over 70 years, an Army Signal Corps Radio School instructor during WWII, and was a radio and other electronics serviceman for much of his life. He always kept a generous inventory of spare and replacement parts on hand, for speedy service calls for his customers, available for walk-in customers to his service shop, and handy for his own electronics projects. All his components were stored in a dry, smoke-free environment. You may select the diodes you would like, either 1N70 by General Electric or 1N21 by Sylvania. Notice that if you order more than one item, the additional ones ship free of additional shipping charge! My husband loves to do research to discover the history of my dad's radio "treasures," and here's a bit of what he found on each one: ITEM: NOS, WW2, U.S. Army Signal Corps, 1N21 Silicon Microwave Mixer Diode. Description: Own a pristine, museum-quality, artifact with this 1N21 - the very FIRST in the modern rectifier series! This vintage, collectible will be prized by: 1 – Collectors of historic semiconductors;2 - World War II aircraft radar buffs;3 – Collectors of U.S. Army Signal Corps WWII militaria.This rarity, encased in a hermetically sealed, ceramic cartridge, with gold plated contacts, is an example of the Sylvania 1N21 silicon rectifier/silicon diode, acquired by the Computer History Museum, inMountain View, California. (Their artifact may be viewed on the museum’s website – see Catalog No. 102711178.) Sylvania Electric Products, Inc. produced this WWII treasure for the U.S. Army Signal Corps. When you add this new old stock (NOS) 1N21 gem to your collection, you can display a first-generation, S-band, microwave, Silicon, mixer diode. It is an example of the EARLIEST point-contact type, diode structure; and, the FIRST mass-produced modern diode! The 1N21 was designed for use as a mixer for the microwave band, in the region of 9 to 11 centimeter wavelengths. Introduced about 1942, the 1N21 front-end mixer was a key component of the Army Signal Corps’ 3-Gigaherz radar sets. These 1N21 crystals were used as superheterodyne mixers in the receivers of SCR-720, airborne, ten-centimeter, interception radar systems. SCR-720 was developed to outfit WWII night fighter aircraft, like the Northrop P-61 Black Widows, Douglas P-70B Havocs and the de Haviland DH.98 Mosquitos. Complete radar systems were developed and produced by the Special Products Department of Sylvania's Lighting Division during WWII. Later in the war, 1N21 silicon rectifiers served as crystal converters in the AN/APQ13, X-band, bombing radar units (dubbed "Mickey"), and deployed as standard navigation and bombing gear on long-range bombers, like the Boeing B-29 Superfortress. Each 1N21 diode is protected by a lead sheath, and individually packaged, with cellulose wadding, in its original box. The cover of this distinctive package is imprinted with the Type Number, Manufacturer and “U.S. Army Signal Corps.” Overseeing supply and maintenance of radar communications was one of the most important wartime missions of the U.S. Army Signal Corps. In 1942, the U.S. Army Signal Corps set up five zones for inspection of communications gear, including critical components of radar systems. Inspected items were imprinted with a Signal Corps. Inspector's stamp to indicate its approval for use. Each of these 1N21 crystal-rectifiers has an inspection stamp (966 A) applied to the end of the box which contains it. This appears to be the U.S. Army Signal Corps. inspection stamp; and is applied with black ink. (The same color ink was used to print the cover of each box.)Inventory Status: New Old Stock, in the package. Type:1N21 Quantity Available:(9) available! Manufacturer:Sylvania Electric Products, Inc., U.S.A. Wave Band:S-Band Test Frequency:3060 Megcycles Case:Ceramic Cartridge (with gold-plated contacts) Construction:The 1N21 silicon mixer diode is similar to the "cat whisker," used in early crystal radio technology. The 1N21 employs a tungsten whisker with high purity, silicon crystal base; and is wax filled with a mixture of Paratac & Opal wax, to render it moisture-proof. The ceramic cartridges were designed with a 3/32-inch diameter contact pin at one end; and a flanged, 1/4-inch diameter contact head at the other. Package Markings: U.S. ARMY SIGNAL CORPSTYPE - 1N21STOCK NO………………….SYLVANIAProduct Markings: The ceramic body of these diodes carries the following imprint, in green ink: ─ 1N21 U.S.A.SYLVANIACondition: These new, old stock, electronic components are untested. Their operating characteristics may have shelf life considerations. These are nonreturnable semiconductors, offered as collectible artifacts, for display; and are being sold As found — As is — As Photographed, with typical age-related, environmental, handling and storage effects. See photos. Seller is unable to test these components and has not applied power to them. Who Wants Them? Collectors of vintage Semiconductors — Radar Buffs —Collectors of WWII Militaria — Collectors of Sylvania artifacts — Science Teachers — Public Museums — Private Museums —Amateur Radio enthusiasts — U.S. Army Signal Corps. collectors ITEM: NOS, Vintage, 1N70 General Electric Co. JAN Germanium Crystal Diode Description: Own a collectible, vintage artifact from the developmental history of semiconductors. This new old stock (NOS) “Crystal Unit” is a military grade, germanium diode, manufactured by General Electric Company in the early 1950’s. Produced using “Method 1A3”, at its “Clyde Rectifier Plant,” in New York, this general purpose diode comes with its distinctive, original packaging; imprinted with the part number, description, quantity, manufacturer, factory location & method of manufacture. Designated 1N70 by the Radio Manufacturers Association in 1951, this semiconductor is an example of GE’s state-of-the-art engineering. This GE “type G5L” diode enclosed the germanium crystal (with welded, co-axial leads) in a special, hermetically sealed, ceramic case. In the early 1950’s, GE offered the 1N70 as one of three, Germanium diodes designated in the JAN (Joint Army Navy) category. These rugged, gas-tight components were designed to be military grade! Inventory Class: New Old Stock (NOS), open package. Seller opened the opaque envelope to verify the contents and its condition. Quantity Available:(1)Only one available! Manufacturer:General Electric Co., Clyde, New York, U.S.A. This information is printed on the packaging. Clyde was the site of GE’s “Clyde Rectifier Plant.” GE Category:This is a JAN (Joint Army Navy) diode, meaning that it is a military grade component, manufactured (and probably tested) to Mil-Spec standards. The Diode bears the ink print “JAN-OG”. GE Part Type:G5L GE Part Number & Description:2J1N70 Crystal Unit RMA Designation:1N70 History:General Electric Co. entered the field of germanium diodes in June,1948, with the introduction of its G5 signal type diodes; based on the ground-breaking research of Harper North. By 1950, GE’s pioneer G5 diode line was expanded to include three, military grade, Germanium diodes in special, hermetically sealed, ceramic cases. Among them was GE’s new G5L diode, approved by the Radio Manufacturers Association (RMA) in 1951; and, designated as 1N70. D.A.T.A. Outline Drawing: A21 Date Code: 2-39 [Probably 39th week of of 1952.] Operating Characteristics (from D.A.T.A. Semiconductor Diode & SCR D.A.T.A.BOOK, 21st Edition, Spring 1968; line 10,906, page 248.) Peak Inverse Voltage (PIV) – WV = 75-79% of PIV = 120 volts Minimum forward current –IF = 3.0 milliamps –at VF = 1.0 volt Maximum reverse current at 25 degrees C –IR = 25 microamps –at VR = 10 volts Maximum reverse current at specified test conditions: –IR = 300 microamps –at VR = 50 volts –at Temperature = 25 degrees C. Average Rectified Forward Current at 25 C. = 30 milliamps Maximum Temperature = 70 degrees C. Manufacturing Method: The packaging indicates that this diode was produced by “Method 1A3”. Package Markings: 2J1N70 Crystal Unit 1 Ea. General Electric Co. Clyde, N.Y. Method 1A3 Product Markings: GE trademark 1N70 JAN-OG diode symbol 2-39 Condition: As found — As is — As Photographed. Seller is offering this untested diode as a collectible artifact. This is a new, old stock, open package item; that may have minor defects which can result from age-related or environmental, handling & storage factors. See photos. Buyer should review photos & the applicable texts before deciding to purchase this item. All electronic items are non-returnable. Wow! That's a lot!! But, if you would love these for your vintage electronics collection, it's great to have the history!! (Don't forget to copy it!)Thanks for looking here!! (misc 9) Who Wants It? Public or Private Museums ─ Collectors of GE products ─ Radio Amateurs (HAMS) ─ Experimenters and Tinkers ─ ─ Electronics Buffs ─ Science Teachers ─ Historical Societies ─ Collectors of vintage semiconductors / military grade electronics ─ ─ Laboratories ─ Anyone from Clyde, New York!

Price: 19.99 USD

Location: New Berlin, Wisconsin

End Time: 2024-08-22T19:54:30.000Z

Shipping Cost: 5.5 USD