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Started by Rob A, November 21, 2011, 08:14:06 AM
Quote from: Electroharmony on November 19, 2011, 11:24:09 PMYou can take a look at the EIA code on the power transformer to get a very general idea. I have 2 later 200A's with the Wurlitzer logo's on the back, one transformer stamped 9th week of '81, the other is stamped 29th week of '79. Of course Wurlitzer probably used whatever stock they had lying around, so while it is not a very accurate way to date, at least you can determine that it was produced after a certain week/year. Also same idea with the EIA code the back of the Vib pot. http://www.triodeel.com/eiacode.htm
Quote from: izzythecat on December 09, 2018, 11:45:13 AMThe 8 digit stamp on the keys had the first numeral smeared, both on the bass side of the keyboard and the treble side. The stamp reads X0421370.
Quote from: izzythecat on December 09, 2018, 11:45:13 AMThe speaker only had a part number and manufacturer code stamped on it, the manufacturer being Carbonneau.
Quote from: cinnanon on December 09, 2018, 01:22:25 PMMy carbonneau speaker reads 651109-1, 719, 417 which probaly 1965 also.
Quote from: izzythecat on December 09, 2018, 11:45:13 AMOne thing that was not mentioned - tube codes.I recently acquired a pristine example of a 720a. I disassembled it to clean out the 5+ decades of dust and to check the condition of the mechanicals. As I cleaned the dust off the tubes, I noticed they were all branded Wurlitzer, original equipment. All the silk screened print was clear and complete. As I am a tube aficionado, I easily found the date codes on the tubes. The preamp tube 6K11 was built by GE during the 22nd week of 1965. The rectifier tube, the 6CA4 is an RCA produced during the 17th week of 1964. The power tubes, 7868, were twins, manufactured by RCA during the 9th week of 1965. (Date codes can be deciphered here - https://www.tubemuseum.org/)The 8 digit stamp on the keys had the first numeral smeared, both on the bass side of the keyboard and the treble side. The stamp reads X0421370. The speaker only had a part number and manufacturer code stamped on it, the manufacturer being Carbonneau. I suppose I could pull the pots to see their date codes but that will be for a later time.With the preamp tube being the youngest of the bunch, I think I can confidently say that this is a 1965.
Quote from: DocWurly on November 12, 2017, 11:32:51 AMThreads on this topic:http://ep-forum.com/smf/index.php?topic=9303.msg50803#msg50803http://ep-forum.com/smf/index.php?topic=9359.0 ...With the 120 and 700, the most consistent dating I've found is a piece of handwritten masking tape hidden on the back of the reed bar. There may be other stamps on the wood or electronics (esp speakers) in certain cases...
Quote from: DocWurly on November 22, 2019, 03:25:20 PM...The most surefire way to date this thing, given all the other mysteries, is by looking on the tubes in the amp. If any of them are the originals, the years and weeks of year will be on those tubes. The transformer might have a date code on it, too...
Quote from: DocWurly on December 08, 2019, 07:48:08 AMAre you sure it's 813 and not 831?