Transformer Serial Number Database By Name This release was created for you, eager to use Abby pdf transformer 1.0 full and with without limitations. Our intentions are not to harm Abby software company but to give the possibility to those who can not pay for any piece of software out there. Serial Number Interpretation 1) Prior to 1969: S/N LXXXX-XX No date code in serial number 2) From 1969 to present: S/N XXLLXXLXXX First two digits indicate year of manufacture e.g.77ZB72A001 (1977 transformer) NECO Corporation, Transformer Division All transformers are. I) Serial numbers with this format indicate transformer manufactured in Jefferson City or Athens. Ii) The first two digits indicate the year of manufacture e.g. S/N 79MJ121096 (1979 transformer) b) S/N XXXXXXX i) Serial numbers with this format indicate transformer manufactured in one of the other Westinghouse facili-ties. (Without Serial Numbers) USA Mfg’d The following transformer welders do not have serial numbers. The date of the manufacture for these units may be determined from the last three digits of the code number stamped on the nameplate. Units Involved:AC-225S, AC/DC-225/125, AC-275, AC-225 GLM, AC-225 SEARS Code Number Example: 9422-001 Code Year Month. Rheem Manufacturing ranks as the global leader in the manufacture of high-quality, sustainable, and innovative water heaters, tankless water heaters, air conditioners, furnaces, pool heaters, and HVAC systems for residential and commercial applications, and is a full member of AHRI, the Air-Conditioning, Heating, & Refrigeration Institute.
Back toOther Triode PagesThese are codes often seen stamped on components found in US made vintagetube equipment. This list is circa 1955, and some codes have been reassigned or added since that time.
Code formats were not completely standardized, but a little decipheringwill generally yield the info of interest. Note that many makers also stampedOEM (Original Eqipment Manufacturer) part numbers above or below the EIAcode, in some cases parts makers or the customer elected not to includethe EIA codes, so not all parts have them.
They generally follow the following format: (example)
322 5904
where 322 is the manufacturer code (in this case Tungsol), 59 is theyear (1959), and 04 is the week.
One alternate scheme is:
274 940
274 is the EIA code (RCA) 9 is the last digit of the year (in this case1949). Usually single digit date codes are from the 1940's, but have on occasion shown up in later decades, even up to the 1970's. If one has a general idea of the age of the piece in question, usually the decade canbe divined from that.
Another alternate is in the format following:
188-5 69 32
188 is General Electric. 5 is the plant code (in this case, Owensboro,Kentucky). 69 32 is 1969, 32nd week.
And another is like this:
322 6104-1
322 is Tungsol, 6104 is 1961, 4th week, 1 is the shift code (1 wouldprobably be the day shift)
After about 1960, many tube manufacturers went to encrypted alphabeticaldate codes., such as:
KE
188-5
The reason was purportedly to allow factories to track the dates ofmanufacture of defective tubes (especially important in the case of OEM customers that might send back entire batches of tubes), but avoid possibleconsumer complaints about 'stale' tubes. This sounds perhaps a little sillysince the shelf life of tubes is decades, at least (indefinite in practicalterms), but some OEM's might have beenn a bit irritated by occasional consumer complaints such as 'my 1961 model TV has 1959 model tubes in it!'
Tubes made for the US military, or certain OEMs (such as some test equipmentmanufacturers) that requested it, continued to carry numerical date codes.
In years past, EIA (Electronic Industries Association) also went by the name of RETMA, and the original acronym of RMA (Radio Manufacturer'sAssociation).
EIA Code Lists for:Tubes
Capacitors
Transformers
Potentiometers (controls) & Resistors
Speakers
Other Manufacturers
| Tubes and CRT's | EIA code |
| Amperex (USA) | 111 |
| Bendix | 125 |
| DuMont | 158 |
| Eimac (Eitel-McCullough, Inc) | 162 |
| Electronic Tube Corp | 169 |
| General Electric Co (USA) | 188 |
| Hytron (CBS-Hytron) | 210 |
| Machlett | 231 |
| RCA (Radio Corp of America) | 274 |
| Raytheon | 280 |
| 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 |
| Nortn American Philips Corp | 423 |
| Taylor (aka Cetron-Taylor) | 713 |
| Lewis & Kaufman | 738 |
| National Electronics (also Cetron) | 749 |
| Penta Laboratories | 771 |
| Vacuum Tube Products | 781 |
| Varian Associates | 809 |
| Litton Industries | 879 |
| Electrons, Inc | 935 |
| Capacitors | EIA code |
| Aerovox Corp | 102 |
| American Condensor | 109 |
| Centralab | 134 |
| Chicago Condensor | 135 |
| Aerovox Hi-Q Division | 163 |
| John E Fast | 178 |
| General Electric | 188 |
| Mallory | 235 |
| Micamold | 240 |
| Millen | 242 |
| Radio Condensor Company | 273 |
| Solar | 296 |
| Sprague | 303 |
| Gudeman | 438 |
| Good-All | 446 |
| Barker & Wiiliamson | 461 |
| Pyramid | 472 |
| United Condensor | 516 |
| Electrical Utilities Corp | 569 |
| Illinois Capacitor (Condensor) | 616 |
| American Radionic | 648 |
| Sangamo | 658 |
| Ajax | 705 |
| Standard Condensor | 710 |
| RMC (Radio Materials Corp) | 732 |
| Condensor Manufacturers | 885 |
| Transformers &Coils | EIA code |
| Stancor (Chicago-Standard) | 138 |
| Coil Engineering | 141 |
| Ensign Coil | 172 |
| Freed | 183 |
| General Radio | 194 |
| Jefferson Electric | 218 |
| Thordarsen-Meissner | 238 |
| Merit Coil & Transformer | 239 |
| Standard Coil | 305 |
| Essex (Transformer Division) | 352 |
| New York Transformer | 366 |
| Altec Lansing-Peerless | 391 |
| Foster Transformer | 394 |
| General Transformer | 412 |
| United Transformer Corp (UTC) | 418 |
| Radio-Television Products Corp | 489 |
| Empire Coil | 452 |
| Caledonia | 503 |
| Triwec Transformer | 524 |
| Midwest Coil & Transformer | 549 |
| Standard Winding Co | 550 |
| F & V Coil Winding | 572 |
| Woodward-Schumacher | 606 |
| Central Coil | 637 |
| Electrical Windings | 682 |
| Grand Transformers | 757 |
| Forest Electric | 773 |
| Ogden Coil & Transformer | 776 |
| Triad | 830 |
| Better Coil & Transformer | 831 |
| Acro Products (Acrosound) | 878 |
| Mohawk | 883 |
| American Transformer | 892 |
| Tresco | 897 |
| Coilcraft | 906 |
| Aerocoil | 908 |
| Acme Coil & Transformer | 928 |
| Magnetic Coil Mfring | 933 |
| Northlake | 1005 |
| Pacific | 1052 |
Westinghouse Transformer Serial Number Lookup
| Resistor & Potentiometers | EIA code |
| Allen-Bradley | 106 |
| Centralab | 134 |
| CTS (Chicago Telephone Supply) | 137 |
| Clarostat | 140 |
| Erie | 173 |
| IRC (International Resistance Co) | 214 |
| Mallory | 235 |
| Muter | 244 |
| Ohmite | 251 |
| Speer | 300 |
| Stackpole | 304 |
| Ward Leonard | 532 |
| Milwaukee Resistor | 722 |
| Dale | 816 |
| Atlas | 932 |
| Speakers (Driversonly, not cabinets) | EIA Code |
| CTS (Chicago Telephone Supply) | 137 |
| Jensen | 220 |
| Magnavox | 232 |
| DuKane (Operadio Corp) | 252 |
| Quam (Quam-Nichols) | 270 |
| Rola | 285 |
| Utah | 328 |
| Western Electric | 336 |
| Altec Lansing Corp | 391 |
| North American Philips (Norelco) | 423 |
| Oxford | 465 |
| Waldom Electronics | 555 |
| Electro-Voice | 649 |
| Russell Speaker Co | 748 |
| Quincy Speaker Mfr Corp | 767 |
| Klipsch | 843 |
| University | 847 |
| Oaktron | 934 |
Transformer Serial Number Database List
| Company | Product | Code |
| Admiral Corp | TV's, Radios | 101 |
| Alpha | Wire | 733 |
| Amphenol | Sockets, plugs | 554 |
| ATR | Vibrators | 551 |
| Anaconda | Wire | 547 |
| Arvin | Sears radios & TV's | 248 |
| Astatic | Phono cartridges | 345 |
| Belden | Wire | 579 |
| Bell | Amps | 708 |
| Bogen | Amps | 589 |
| BIC | British imports | 409 |
| Cannon | Connectors | 440 |
| Cinch | Sockets, connectors | 139 |
| Collins | Radio gear | 439 |
| Connector Corp | Sockets, connectors | 888 |
| Consolidated | Wire | 607 |
| Crosley | Radios | 152 |
| Drake | RF gear | 851 |
| DuKane (Operadio) | Amps | 252 |
| Eby | Sockets | 160 |
| Empire | Phono cartridges | 452 |
| Essex | Wire | 175 |
| Gates | RF gear | 187 |
| General Cement | Adhesives, Testor's paint | 396 |
| General Radio | Test Equip | 194 |
| Hallicrafters | Ham & SW gear | 199 |
| Hammarlund | Ham & SW gear | 201 |
| Harmon-Kardon | Hi-fi gear | 794 |
| Hickok | Test Equip | 508 |
| International Rectifier | Semiconductors | 845 |
| Jackson | Tube Testers | 216 |
| E F Johnson | Sockets, ham xcvrs | 222 |
| Kester | Solder | 224 |
| Keystone | Hardware | 699 |
| Lenz | Wire | 228 |
| Littelfuse | Fuses | 230 |
| McIntosh | Hifi gear | 793 |
| Methode | Connectors | 720 |
| James Millen | Sockets | 242 |
| Muntz | Cheap TV's | 772 |
| National Co | Ham & SW gear, hifi | 245 |
| Newcomb | Amps | 437 |
| Packard Bell | TV's radios computers | 254 |
| Philco | Radios & TV's | 260 |
| Philmore | Hardware | 262 |
| Pickering (Stanton) | Phono cartridges | 631 |
| Pilot | Hifi tuners & amps | 264 |
| Pioneer | Cheap recievers | 706 |
| Precision (Grommes) | Hifi & PA amps | 871 |
| Radio Craftsmen | Hifi gear | 275 |
| J P Seeburg | Jukeboxes | 289 |
| Shure Brothers | Phono carts, mics | 590 |
| Mark Simpson (MASCO) | PA Amps | 295 |
| Simpson Electric | Meters | 614 |
| Sonotone | Phono cartridges | 787 |
| Tetrad | Phono cartridges | 842 |
| Triplett | Test equipment | 321 |
| Wells-Gardner | Monkey Wards radios | 334 |
| Weston | Test Equipment | 338 |
| Zenith | Radios & TV's | 343 |
Ge Transformer Serial Number Lookup
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