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I'd like to work out if this is a deliberate change of measurement made by Yamaha for speccific models or simply anj case of the original imperial measurements being changed to decimal and back again, each time changing slightly for the previous. 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 doesn't have space for the S (Small) Bore or MS (Medium Small) bore, nor does it differentiate between same bore sizes, so I'll list the measurements in order and assume that the number system simply doesn't hold true anymore, other than maybe the 3 and 4 designation.
Step Bore S = 10.50mm / xxx" (eg: YTR-6810) MS = 11.00mm / 0.433" (eg: YFH-631) M = 11.24mm / 0.442" (eg: YTR-946) M = 11.25mm / 0.443" (eg: YTR-948FFMS) M = 11.30mm / 0.445" (eg: YTR-6310) ML = 11.65mm / 0.459" (eg: YTR-6335H) ML = 11.68mm / xxx" (eg: YTR-4335G) L = 11.73mm / 0.462" (eg: YCR-2310II) L = 11.76mm / xxx" (eg: YTR-6340) L = 11.90mm / 0.469" (eg: YCR-8335) If anyone wants to supply me with the correct fractional imperial measurements it would be appreciated.
I have not found any material to classify the percentage of copper in each of the bell materials yet, in a fashion simialr to those used by Vincent Bach on each of the individual shop cards he kept for every single trumpet.
Note that this does not have any bearing on the material used in the leadpipe. Again, this letter is only used when a model is available with both a standard or a reverse construction leadpipe.
I think this seems to be fairly well established, although the listed items in italics are more theoretical.
1 - Bb Bass (eg: YTR-916) (as only one set of custom made Bass Trumpets exist it is hard to say whether this was the intent of the the series number but it seems to make sense although doesn't fit into the 3 digit model numbers.) 2 - Eb Alto (no known Eb Alto trumpets exist but it would make sense that the number 2 was reserved for this pitch.) 3 - Bb (eg: YTR-6335) 4 - C (eg: YTR-8445) 5 - D (eg: YTR-651)6 - Eb/D (eg: YTR-6610) 7 - G/F (eg: YTR-9710) 8 - Bb/A Piccolo (eg: YTR-6810) 9 - C Piccolo (eg: YTR-9910) I think this was probably the intended system when the 4 digit model numbers were developed, but it just seems to dissappear in any organised form as more models have been introduced into the range.
Genrally, I believe that gold plating is applied over silver plating or nickel as it does not adhere to raw brass very well, and as such most gold plated Yamaha trumpets will have started life as a lacquered or silver plate version of the trumpet. I have found one instance of this being used to denote a tinted Gold Lacquer in a range available with standard clear lacquer also.
If a model is only available in a silver plate configuration it would appear that the "S" is not used, eg: YTR-9610.There simply isn't 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.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.