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Serial number confusion


muel

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Just curious… perhaps this has already been discussed but I have found conflicting information on serial numbers for Heritage and the year of manufacture. If you are counting the years backwards it appears the discrepancy begins where one reference uses the letter I (reference 2 below) and the other skips the letter I. Probably not a big deal to be off by a year one way or the other but I’m wondering if anyone has more light to shed on this. It would be neat to know if my Cornwalls were built the year my wife was born.

Lot of information here... finish codes, driver history etc...

Reference 1:http://www.klipsch.com/media/products/downloads/heritage-reference-data.pdf

Excerpt from page 6..

YEAR OF MANUFACTURE (1955 THROUGH 1983 ONLY)

A = 1955-63* F = 1968 L = 1973 S = 1978

B = 1963-64* G = 1969 M = 1974 T = 1979

C = 1965 H = 1970 N = 1975 U = 1980

D = 1966 J = 1971 P = 1976 W = 1981

E = 1967 K = 1972 R = 1977 X = 1982

Y = 1983

* Cornwall's & La Scala's used "A" 1963 and "B" for 1964; thefirst Cornwall to use a letter code was 3A09, shipped in Augustof 1963.

Reference 2:

http://home.earthlink.net/~ivol/klipsch_cornwall/klipsch_date_codes.htm

KLIPSCH S/N FORMATS

DATES

DISCRIPTION EXAMPLE
1946-1947 ### 001 (ending #021)
1948-1961 #### 0121 (starting #0121)
1962-1983 ##letter#### 20Y1234
1984-1989(?) YY WW #### 89281234
1990-1997(?) DOY Y2Y1 #### 135791234
1998-2000 YY WW #### 00281234


1962-1983 Letter format

A = 1962

F = 1967 K = 1972 R = 1977 X = 1982
B = 1963 G = 1968 L = 1973 S = 1978 Y = 1983
C = 1964 H = 1969 M = 1974 T = 1979
D = 1965 I = 1970 N = 1975 U = 1980
E = 1966 J = 1971 P = 1976 W = 1981

NOTES


1946-1961 dates can only be found in log book (eng. Library)

DOY= day of the year
YY=year (i.e. 99,00…)
Y2Y1=2nd digit of year, 1st digit of year
WW=week of the year

Date code on drivers (1994) Example - 9429 = 1994, 29th week of the year / YYWW

† Klipschorns of this vintage had the s/n hammer stamped into the tailboard, woofer access door or inside the woofer chamber.
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I think the letter "I" was sckipped to reduce confusion with the number 1...I recall reading that somewhere, so I think the guide #1 is the correct one...it is the one I always use. I am sure there are several people on here with '69, '70 and '71s that could shed more light as to accuracy...my oldest are a pair of '74s, so none of mine could answer the question.

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