From what I can gather,
Post-1984
The modern Ampegs of the St. Louis Music era were all made after 1985. The amps made since 1988 have a 10-digit serial number which is encoded for model, country, date, and year. The serial number can be broken down as follows:
Digits 1, 2, 3 = Model
Digit 4 = Country Code where:
U = U.K.
D = domestic U.S.
W = worldwide
Y = Europe
Digit 5 = Year where:
A = 1988
B = 1989
C = 1990
D = 1991
E = 1992
F = 1993
G = 1994
H=1995
I=1996
J=1997
K=1998
L=1999
M=2000
N=2001 etc
Digit 6 = Month where:
1 through 9 = January through September
0 = October
A = November
B = December
Digits 7, 8, 9, 10 = serial number
[b]SO[/b] my question relates to a 1x15 cab that I picked up off Zombywoof from these pages. The serial number starts 115EI4**** which in my reckoning means the 115 reflects the model. The E is what? A variation on Europe? And is this an April 1996 model? Any pointers gratefully received.