It would appear that gold plating is available as an option from the factory through their Custom Workshop or Alteliers.There simply isnt enough (appropriate) numbers to accomodate all the possible bores in a logical sequence.Also worth noting is the variance of measurements in the same bore sizes.
Any thoughts or knowledge in this area The measurements I have are as follows: 1 Step Bore (YTR-6310Z) 2 M (Medium) (YTR-6320) 3 ML (Medium Large) (YTR-6335) 4 L (Large) (eg: YTR-8445 But this doesnt have space for the S (Small) Bore or MS (Medium Small) bore, nor does it differentiate between same bore sizes, so Ill list the measurements in order and assume that the number system simply doesnt hold true anymore, other than maybe the 3 and 4 designation. Ie: a 6335 and 6330B are both Proffesional Level, Bb, and ML bore, but the final number differentiates between the actual design of the trumpet. I think that this system worked initially until model models and artists developed and this system simply ceased to work as intended. The addition of letters as described below has been introduced to help over come the limited combinations of numbers only. As far as I can tell there is no specific meaning to each number other than to differentiate one from others. EDIT: I have realized that this description is not actually correct for the last number. It basically alternates between a 0 or a 5 (with a few exceptions). The 0 represents trumpets with a reverse construction leadpipe, and the 5 represents a standard construction leadpipe. Of course this doesnt hold true for the higher pitched trumpets with tuning bells and adjustable receivers etc. Letters The use of letters is inconsistent so needs to be looked at individually for each model really. S Silver Plate. The letter S is used to denote Silver Plating. It is not used to denote a Small Bore even though the Custom range of Bb and C trumpets from 1982-85 started including the bore size in the model number similar to Bachs (eg: YTR-9330ML). Additionally, note that S is NOT used for ALL silver plated instruments though. It would appear that the S is only used when a particular model is offered in both a lacquered version and silver plate version. If a model is only available in a silver plate configuration it would appear that the S is not used, eg: YTR-9610. This is made more confusing as Yamaha themselves market some particular trumpets with an S in their marketing material but not actually stamped on the same instument, eg: the Xeno Artist Series trumpets, only available in silver plate but marketed by Yamaha as YTR-8445CHS in all of their published material. When you look at the actual instruments, they are stamped as YTR-8445CH. I guess if you are looking at purchasing a Yamaha trumpet 2nd hand you must know what configurations it was originally offered in before knowing if a particular instrument has been modified or not. Also note that there is NO denotation for a lacquered instrument. I deperately need more close up photos of model number to actually confirm what is actually being done by Yamaha. GP Gold Plate. The letters GP have been used for a very few select models offered with gold plating as the only available finish or as an option.
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