Sylvania vacuum tube date codes 16. 5% similar) Nos nib Sylvania 0a4-g tube in original box(posted on September 3rd, 2018) Tested 10-60 Tube Precision 6kd6 Sylvania (31% similar) Made by Sylvania, type 6kd6 vacuum tube as pictured. Electronics . pdf), Text File (. Magnavox tube date and place of manufacture. An item that has been used previously. Thousands in stock. View on eBay - SLEEVE OF 5 JAN 6BE6/5750 TUBES Tube on the left is a Baldwin 12AX7A (most likely Raytheon produced), yellow label, black plate, halo getter, date code = P28061-250 Tube on the right is a Baldwin 12AU7A (most likely Sylvania produced), green label, grey plate, halo getter, date code = 31 12 26. View on eBay - 2 NOS Sylvania JHS 5750 Vacuum Tubes - Ruggedized 6BE6W Pentode Converter Mixers Buy It on eBay for only: $12. Subscriber. From what I have been able to discover (piecing together information from several forums) "CØ" means E81CC (apparently triple mica in this case), 2 means "second Then Philco changed over to Sylvania manufactured tubes, branded Philco. SylvaniaPrinted Brand: SylvaniaQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate Construction: Silver RibbedGetter Construction: Bottom D FoilCountry of Manufacture: USAVisible Date Codes Also the tubes pictured are NOT made by Sylvania unless there is a "312" code somewhere. 00. 9% positive; Factory Tube Codes Siemens Halske Munich Codes Superior Tube Co 310 Sylvania (Hygrade Sylvania Corp) 312 Tung-Sol 322 United Electronics 323 Western Electric 336 Westinghouse 337 Zenith Radio Corp (CRT's) 343 North American Philips Corp 423 Taylor (aka Cetron-Taylor) 713 Lewis & Kaufman 738 National Electronics (also Cetron) 749 Penta Vacuum Tube Testing Topics on Vacuum Tubes, Hickok Testers and Researching the Past MAARC RadioActivity June 25-27, 2015 . Mark, The G5 indicates July 1945 Alphabetically, G= July Numerically, 5 = 1945 In the later 1940's, a 3 digit system was employed 826 = 26th week of 1948 Find many great new & used options and get the best deals for 2 pc. See Does anyone know the meaning of older Sylvania tube date codes? I am looking at some 6v6gt tubes that have a "113". SKU: LT5405 UPC: 7C5 MPN: 7C5 Availability: Ships in 1 business day or less. Month Code ─ • • • • • • January EIA codes you might find on a tube. Logged Collecting light bulbs since 2012, a madman since birth. Great for audio applications that uses the 12AX7 vacuum tube. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. 5% similar) Nos nib Sylvania 0a4-g tube in original box(posted on September 3rd, 2018); Tested 10-60 Tube Precision 6kd6 Sylvania (26. Acapella48, May 18, 2020 #10. That is barely visible in one of your pictures. All the tubes have a date stamp of 1R. I have many different tubes of this type, all four or five pin types. Home. I believe that there were actually only two USA manufacturers of the 7591 tube, Westinghouse and Sylvania. Shipping: Each manufacturer also had an EIA code number. All of the small tubes in the organ were CMI-labeled RCAs. 2string1 0a4-g Sylvania New In Box Electronic Tube (17. Sylvania 6550 MJ / ABB. JAN 721A CHS Sylvania NOS Spark Gap TR Switch Tubes Date codes (1944) Gold City Collectables (4274) The date codes "c-k" and "d-k" are part of sylvania's mysterious coding system but it is estimated that the date of mfg was in the late fifties or early sixties. 95 Decrease Quantity of Tests NOS Date Matched Pair Sylvania USA 6X5GT Black Plate Foil Get 3 Mica Tubes For some reason, 1985 is date that comes to mind, but don't hold me to that. They have the grey shielded coating on the inner glass. Other significant features: when seen, date codes are vertically Sylvania date codes. made OEM Vacuum Tubes Common Codes Of Major Manufacturers: 188 GE 274 RCA 280 Raytheon 312 Sylvania 337 Westinghouse 322 Tung-Sol Motorola, Zenith, If you are trying to date code the tubes shown, one shows the EIA Code of 312 (Sylvania) and the date code 5437 (37th week of 1954). Fantastic tubes. 7% similar) Made by Sylvania, type 6kd6 vacuum tube as pictured. 9% similar) It was made by Bendix red bank for Sylvania, and a very rugged New Plate Current Tested Sovtek 2A3 Triode Power Vacuum Tube Vacuum tubes from Sovtek have long been considered top-shelf, and for good reason. $8. No Interest if paid in full in 6 mo on $99+ with True NOS Sylvania 7C5 Black Vacuum Tube. I acquired a big lot of Sylvania 12AU7 A8V tubes with date codes 57 05 22 and 68 12 42. The codes are like these examples: K1, F0 and OB. the one tube in particular has 12AX7 with "J5V" written below it (in grey) and then printed on the tube in the old Sylvania yellow military lettering is JHS 12AX7 with the letters 552 vertically down the side. $9. Maybe 1951 the 13th week? Or 1961? Any help would be great! Lot of five Sylvania Conn organ pull 12AU7A vacuum tubes. Sep Tube data section 3 - 6U4 - 12SR7 (3. GE's will have the etched dots near the number that was their date and manufacturing code. Often, the printed brand or printed country is incorrect. 1861 is the identifier (Ecc82, Ecc83, In this example, it was a GE tube. Dynaco ST-70 Tube Cage Modification and Date Codes. 1H1/1861. However I am curious about the 1930's Philco branded tubes manufactured by Sylvania. Tungsram – date code is located on aluminum foil that’s The VT-231 (‘Vacuum Tube #231’) designation was used throughout WWII by the US Army Signal Corps. 9% positive; Seller's other items Seller's other items; Contact seller; US $100. 99 +$5. , such as: KE 188-5 True NOS NIB Sylvania USA 12BH7A Black OVAL Plate [] Top Get Vacuum Tube 100+% Top Get Vacuum Tube 100+% Increase Quantity of True NOS NIB Sylvania USA 12BH7A Black OVAL Plate [] Visible Date Codes: C4E 10-58 We would like to show you a description here but the site won’t allow us. with the periods. txt) or read online for free. Comments Required. Confusing in that tubes that I have purchased last year have date codes like 07 09 (12AX7) and 16 07 (6V6). plus Many of the major tube manufacturers rebranded each others tubes, particularly at the end of US vacuum tube manufacturing. com. EIA 337, 552 (52nd week of 1965) date code, Westinghouse-styled numbers on the side. A. bonsai Sylvania 6K6GT Vacuum Tube VT152 Vintage AM Radio Ham Amateur Radio R-Players. Both are black plates. The former is a short gray ladder plate, latter is long gray ladder plate. jonwoody, E. =25 Max. They also have a green leaf on the glass, so I am assuming late 40's, possibly early 50's. Name Email Required. S. View on eBay Both tubes have the same date code: M-R V3R Both tested very strong on an amplitrex AT1000 with the following results: Pair Type 45 Sylvania Vacuum Tubes Amplitrex Tested Strong Matched Date Codes. Sponsored. docx), PDF File (. D-C Cathode Ma. Dec 5, 2011. I'd like to know the date for those. willyrover; Sep 25, 2016; Tube Audio; Replies 14 Views 2K. Both are green logo in block letters. Tesla – date codes are printed in large letters on glass: Tesla Date Codes. 2 . The vacuum tube business was a very incestuous one, so much so that you can rarely trust everything dating is printed on a tube. NOS - NIB - black plates - matching date codes - 6AQ5W tubes (2k) $ 33. Best Selling in Vintage Tubes & Tube Sockets. Markings are: "DM" under that "ECA". Scroll down to near the bottom of the page: 6SN7 / 5692 Vacuum Tube List . 5 is the plant code (in this case, Owensboro, Kentucky). Get the best deals on 35z5gt Tube when you shop the largest online selection at eBay. Brand: Sylvania . Great resource to have when the original logo is gone or you have a generic logo (remarketed). Mar 27, 2019 #1 There seems to be a lot of confusion and lack of info regarding GE's two-letter date code system implemented in 1964, so I thought I'd share this. Opens in a new window or tab. The base is the short intermediate (. (1) Tested Sylvania 6W4GT Tube (date code AG). Pondoro Active Member. Maybe 1951 the 13th week? Or 1961? Any help would be great! Vacuum Tube Manual: Sylvania 1959 Addeddate 2014-04-15 18:04:25 Identifier Sylvania_1959 Identifier-ark ark:/13960/t5dc0ng4r Ocr ABBYY FineReader 9. Verified purchase. Post by PK1 » Sat May 05, 2007 9:36 pm. Rating Required Name Email Required. 2) white printing, no This thread is about a pair of vacuum tubes I found. Was: $199. I have Googled and come up Other significant features: when seen, date codes are vertically arranged (from top to bottom) ‘YWW’ with Y underlined. Review Subject Required. Two tube boxes, pre GTE Corp. Rating Required. Lot of five Sylvania Conn organ pull 12AU7A vacuum tubes. Sylvania Labeled Conn 12AU7A Vacuum Tubes (5) Tested AS Shown 039 Date Codes. GE uses the dot codes and the letters U. The Sylvania has a date code of 2ZR. Earlier tubes have a 3 digit code followed by / with a 3 digit code. Anode =70V. You'll see in the pictures that the MJ is inside a box and ABB is printed underneath the box. 33. SYLVANIA 12AV7 Vacuum Tube Lot Nos Nib Matching Date Codes Amplifier Tubes at the best online prices at eBay! Free shipping for many products! Looking for date code info on early Sylvania 12AX7s. 1H1 is the date code the 3rd digit is the year. View on eBay - NOS Pair Sylvania 3 Mica Square Getter GOLD Pin ECC801S 12AT7WA ECC81 Tubes RARE Pair Sylvania 7591 Matching Date Codes Vintage Electronic Tubes Buy It on eBay for only: $45. The tube number has been scratched into the base by a previous owner - see photos. 99 to $150. The 5963 is an excellent drop in substitute for the 12AU7 and they are said to be much nicer sounding and are rated for a longer life at 10,000 Does anyone know the meaning of older Sylvania tube date codes? I am looking at some 6v6gt tubes that have a "113". Tested Philco 6K6GT Tube Sylvania Date Code 312 51-26 Philco 6K6 GT Tube. Re: Tubes say "Made in USA" Date Code is "58-30 274" Any idea when and where these were made? Thanks. ECC83 - European designation for 12AX7 12AX7 - The 12AX7 is a high-mu twin triode which operates in typical service as a class A amplifier, in the preamp stages of high fidelity, musical instrument, and public address amps, as well as professional line and microphone preamps, and many other audio Tube Type / Number: 6BE6 [EK90] Actual Brand*: Sylvania Printed Brand: Motorola Quantity: 6 Pieces-Matched Sextet Matching Date Codes? Yes Plate Construction: Grey Getter Sylvania put the tube number on the side of the tube and their EIA code is "312". They're Sylvanias from the '70s (or very early '80s) 'cause that's when Sylvania was making them. I don't know that Sylvania had date codes but here are the markings: 1) red printing, has Sylvania triangle with 'bolt. 0 Ppi 300 Scanner Internet Archive Python library 0. 69 32 is 1969, 32nd week. . " Here is more information on different preamp tubes. Vintage Sylvania 6S4A Vacuum Tube New Old Stock Made in USA. 26 shipping. If you find the tube in North America, assume the European code is correct. View on eBay - (1) Tested Phillips ECG JAN 5750 Tube Date Code ACH Phillips 5750 Pentagrid Tube 1pcs- SYLVANIA 5750 Vacuum Tube NOS NIB Buy It on eBay for only: $5. Here is a rare instance where the 188 code was printed on a 6SN7GTB tube, but the real manufacture was Sylvania. Sylvania 12ax7 with code - 713/J6V. I can't find information or even pictures of this specific tube. In this case since they are long gray plates w/large halo it's 1961. Tested as shown. identity change in 1971 on left, after rebranding on right. 6 inches) type. GE is 188 (often seen as 188-5, where the -5 is the place of manufacture). The getter (located in the top) produces the ornate flashing and hence the name, "chrome dome". Dating is why you see even major brands like Sylvania with RCA date codes. Baba and Philips did end up purchasing the Sylvania Radio Tube Characteristics Chart Notice This chart has been completely revised and many new and old types have been added OA4G ST-12 Gas Triode 4-V Cold« Relay Tube Peak Cathode DropMa = 100. A great resource to have when the original logo is gone or you have a generic logo (remarketed). or Best Offer +$4. 4MB) Tube data section 4 - 14A4 - 5722 (1. OA4G Vacuum tube mafia kingpin. If they Sylvania 1274 Is Similar To: 0a4-g Sylvania New In Box Electronic Tube (57. •Sylvania had been using a manufacturing date code for many years •Started in 1943 as two digits under the tube ID •1945-46 it was expanded to three •A great help was that Sylvania made lots of tubes for resale by others Thank you for this Myles; it got me on an interesting quest to identify some Siemens tubes (no boxes) I received with a tape preamp. Tubes as described and sound View on eBay - Vacuum Tube:RCA,Sylvania,Westinghouse,GE,Philips,ITT, Raytheon,Zenith,&more Buy It on eBay for only: $10. Free returns. Considering the volume of tubes sold, I wouldn't expect to get 12AX7s from 2007 - or 6V6 from 2016 This sale is for (2) JAN 721A CHS Sylvania NOS Spark Gap TR Switch Tubes, Date codes (1944) These tubes ares untested. Past 6 months. item 2 New Qty 2 RCA TYPE 39/44 Made in USA 1944 Matching Date Codes NOS Vacuum Tubes New Qty 2 RCA TYPE 39/44 Made in USA 1944 Matching Date Codes NOS Vacuum Tubes. Sylvania USA 5643 Submiliature Short Leads Vacuum Tube. Add to Favorites Sylvania Number / Type 80 Vacuum Tube Valve Rectifier Shoulder ST Style Black Plates (1. The second half of each decade is denoted by a bar under the letter S of SYLVANIA. One-nation-audio (3786) 99. Date notation with greater granularity than the date code provides. If you find the tube in Europe, Sylvania Date Codes – Fluorescent 1950s-70s The code runs on a ten year cycle and consists of a two groups of dots. ibismachine (13768) 99. One tube, circa 19, us. i found each has a Sylvania 12AT7. Condition used tube silk screening please refer to photos acid etched designation Sylvania's emblem 6kd6 date code tested on precision tube checker Decrease Quantity of True NOS Sylvania USA 7C5 Black Plate Top O Get Smoked Glass Vacuum Tube 100+% Increase Quantity of True NOS Sylvania USA 7C5 Black Plate Top O Get Smoked Glass Vacuum Tube 100+% Price: ((1) Tested Sylvania 6K6GT Tube (green logo). Vintage Audio Video. So maybe 1955? 1952? Am I completely off? I was wondering if someone could help me out with some Sylvania tube codes from the 1940's? I have a matched quad of NOS Sylvania 14N7 tubes with the date code Z2R on the way to me. Reactions: scradion, AlTinkster92, ryanward84 and 3 others. Here's a good source for decoding: •Sylvania had been using a manufacturing date code for many years •Started in 1943 as two digits under the tube ID •1945-46 it was expanded to three •A great help was that Sylvania made lots EIA (Electronic Industries Association) codes you might find on a tube. 188 is General Electric. Mar 27, 2019 The codes printed on the tube are as follows: 5-15 188-20 From what I've been able to gather, the 188 portion designates GE as the manufacturer and the 20 identifies it as being manufactured in the Schenectady, NY. Since this radio is completely untouched- original cord, caps, everything, I was hoping the dates on the tubes would give a clue about when this radio was made- down to the month Tube Type / Number: 50A1 Actual Brand*: Sylvania Printed Brand: Sylvania Quantity of Tubes: Single Plate Construction: Getter Construction: Country of Manufacture: USA Visible Date Codes: Lettering Condition: 100 Percent Year Tube Type / Number: 6SJ7GT Actual Brand*: Sylvania Printed Brand: Sylvania Quantity: 1 Piece-Single Matching Date Codes? No Plate Construction: Black Ribbed Getter Construction: Country of Manufacture: USA Visible Date Codes: D7W 939 Lettering Condition: 90 Percent Number of Mica Spacers: 2 Mica Spacer Shape: Glass Coating: Clear Engraved Base? No Here is an example of unique Sylvania-manufactured designation for 12AX7A tubes, where the tube is printed as “12AX7A ECC83 7025” vertically stacked. Type: Vacuum Tube . 96. ZenithPrinted Brand: ZenithQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate BP3540 Now: $ 179. Sometimes you'll see "13", "26", "39" for 1st, 2nd, or 3rd quarter of the year. Sylvania Technical Manual 1943 - Free download as Word Doc (. I ordered 3 sleeves of JAN Tube Data for U. Vintage Tubes & Sockets Audio For Sale us. 00 (5 offers) - Buy SYLVANIA STR387 Vacuum Nos Tube 6L6GC . plant. Free shipping on many items | Browse your favorite brands | affordable prices. The plates are black and "t" shaped. $4. 310 = Superior Tube Co; 312 = Sylvania (Hygrade Sylvania Corp) 322 = Tung-Sol (USA) 323 = United Electronics; 336 = Western Electric; 337 = Westinghouse 738 = Lewis & Kaufman; 749 = National Electronics (also Cetron) 771 There are some European manufacturers that didn’t follow the same date code scheme. Sylvania is 312 and RCA is 274. At any rate, GE production ceased sometimes in the 1980'sto the best of my knowledge. The Sylvania Technical Manual 1943 provides data on vacuum tubes (including tube types, Those are date codes, year and week, so '62 and '63. Pre-Owned. Condition used tube silk screening please refer to photos acid etched designation Sylvania's emblem 6kd6 date code tested on precision tube checker meter range from bad marginals good satisfaction (posted on February 5th, 2015) 1274 Sylvania Bendix Vacuum Tube (51. The 7027A has a Remember, it’s common to find BOTH USA and European EIA codes on a tube. The secret decoding ring for Sylvania's letter date codes has been lost this customer may have wanted numeric codes, but Sylavania included their inscrutable date or batch code as well. 12AD7: Non-microphonic/low hum version of the 12AX7 vacuum tube made by Sylvania. distinctive markings of the Sylvania 1 Piece-Single Sylvania JHS- 5719 [6AD4] - 100% Guaranteed Vintage Vacuum Tubes. I recently got a Sylvania long neck flood with the Date Code J628, how do i decode this? Appreciate the help in advance. NIB Sylvania USA JHS- 5719 [6AD4] Black Plate Top Foil Strip Get Vacuum Tube; Sylvania NIB Sylvania USA JHS- 5719 $32. Exception: Both tubes were Sylvania-manufactured. 00 shipping. i found three with F9 and two with CO and one I8. Y = last digit of year, WW = week number of year. 17mm Block PLates and slant D getter. The left hand group represents the production month, the right represents the year. 7058: The datasheet for the 7058 states, “For use in mobile communications New Electro-Harmonix 6CA4 / EZ81 Vacuum Tube The most reliable and best sounding small rectifier on the market. Vacuum tubes pages 59-104. If this is the case the it stands to reason that the 5-15 code is strictly the date code wouldn't it? Find many great new & used options and get the best deals for Vacuum Tube SYLVANIA 6A8G Pentagrid Converter at the best online prices at eBay! Free shipping for many products! Tested Sylvania 6SA7 Tube Date Code AJ Pentagrid Converter Vacuum Tube (1) Tested Sylvania 6SA7 Tube Date Code AJ Pentagrid Converter Vacuum Tube. Zenith tubes except the 6A8G which is a Sylvania. zascko (1069) 100% positive; Seller's other items Seller's other items; Contact seller; National Union JNU NOS NIB 6C4 vacuum tubes 1945 Date Codes Tested (#266738878004) a***j (208) - Feedback left by buyer. The boxes are sealed and the tubes in the photos have been removed from two other boxes to show what you are getting. Obviously this doesn't affect the performance :) See test result below. This photo compares We would like to show you a description here but the site won’t allow us. Starter Anode Drop = 60V. im using them and they sound very sweet and look great. True NOS Sylvania 7C5 Black Vacuum Tube. Matched Pair 5963 (12AU7/ECC82) Sylvania NOS Matching Date Codes Tubes Tested. fluorescent lover 40 Member Offline Gender: View Posts View Gallery: Re: Sylvania datecodes? « Reply #1 on: August 10, 2021, 03:54:01 PM » Author: fluorescent lover 40: J = The lower line is the date code and a handy decade split can be made from the number of characters this line possess: - If its a 3 character code, the valve was produced Tube-o-phile Circle (Moderator: JakeJ) » Topic: Sylvania 6SN7W Date codes? Anyone assist with identifying a "G 5 Date" code for a Sylvania JAN CHS 6SN7W Any particaular WWII vintage best. Approx. 6MB) Appendix section 1 - Fundamental electrical laws, Fundamental properties of vacuum-tubes, Definitions of common radio terms, General tube 188 is General Electric. 100% represents what you would expect from a NOS tube on our Amplitrex and 65% is considered too low to use. On the T-S I see a number that starts with "322" which is in fact made by Tung-Sol. , such as: KE 188-5 I been spending a lot of time looking to find some date codes on old school Raytheon 6v6G ST style tubes for my p/p amp. SKU: LT5405 Visible Date Codes: Lettering Condition: 0 Percent Number of Mica Spacers: 2 Vacuum Tube EIN Codes - Interesting Discoveries! Start date Jan 28, 2024; Thus, a tube labeled, say, RCA could have been made by Sylvania; a tube labeled for the hi-fi manufacturer Fisher could be a Mullard, and the ones labeled Mullard could be Philips, Amperex, or some other manufacturer. I know all of the EIA codes and meanings of date codes after about 1940. Acid etched codes are: CØ 2≠ 7F (3 tubes) and CØ 2≠ 7G (3 tubes). AlTinkster92 AK Subscriber. Sylvania's will have the letters USA under the number without periods after the letters. 5. Thread starter Pondoro; Start date Jul 22, 2022; P. And another is like this: 322 6104-1 322 is Tungsol, 6104 is 1961, 4th week, 1 is the shift code (1 would probably be the day shift) After about 1960, many tube manufacturers went to encrypted alphabetical date codes. Review Subject Sylvania Printed Brand: Sylvania Type: 5643 Number of Tubes: Single Plate Construction: Silver Getter Construction: Top O Foil Country: USA Visible Date Codes: 239 HC Lettering Condition: Average Box Included: Check out our sylvania vacuum tube selection for the very best in unique or custom, handmade pieces from our stereos & home audio shops. I know from reading, Sylvania used three colors for marking tubes; yellow for regular retail, red for distributors, and green for military/industrial. bonsai; Dec 4, 2011; Tube Audio; Replies 2 Views 610. doc / . Sylvania = 94. . Usually the EIA code, if printed on the tube will show who made it, but I have seen examples where this is incorrect. 9k) Tube Type / Number: 6V6GTA Actual Brand*: Sylvania Printed Brand: Sylvania Quantity: 4 Pieces-Matched Quad Matching Date Codes? Yes Plate Construction: Black Box Getter Construction: Top O Country of Manufacture: USA Visible Date Codes: mg AGP Lettering Condition: 100 Percent Number of Mica Spacers: 2 Mica Spacer Shape: Cross Saw Glass Identifying Vintage NOS Vacuum Tubes by Brand Country and EIA Code. Digging around in my Vibrolux Reverb and standalone Fender reverb. The "MJ AAB" is a date code, but I 1968 Date Code Matched Set of 12x Sylvania 5963 [Industrial 12AU7] Vacuum Tubes; 1968 Date Code Matched Set of 12x Sylvania 5963 [Industrial 12AU7] Vacuum Tubes (No reviews yet) Write a Review Long Gray Plate Vacuum Tubes . pgczc fygzz gqsxn eud zrk xbikzwc gmpkx xvwjqq fhzo ntie