Marshall Amp Forum - View Single Post

Pearse · 07-08-2008, 11:52 AM

Hey man see if this helps looks like the cab is of all different dates or at least the speakers are. there still pretty old though.

Since 1956, all Celestion chassis drivers have been stamped with a date code (2 numbers and 2 letters), denoting the exact date of manufacture. The codes are added on the production line and are placed on the speaker's housing leg or the magnet edge. The following lists provide an accurate record of the date codes used.

1956 - 1962

YEAR

CODE

MONTH

CODE

1956

A

January

A

1957

B

February

B

1958

C

March

C

1959

D

April

D

1960

E

May

E

1961

F

June

F

1962

G

July

G

August

H

September

I

October

J

November

K

December

L

The datecodes from 1956 to 1962 are written in the form: Day, Month, Year. For example: 15DE = 15th April 1960

1963 - 1967

YEAR

CODE

MONTH

CODE

1963

H

January

A

1964

J

February

B

1965

K

March

C

1966

L

April

D

1967

M

May

E

June

F

July

G

August

H

September

J

October

K

November

L

December

M

Note the loss of the 'I' from the month codes. The date codes from 1963 to 1967 are written in the form: Day, Month, Year. For example: 19MK = 19th December 1965

1968 - 1991

YEAR

CODE

MONTH

CODE

1968

A

January

A

1969

B

February

B

1970

C

March

C

1971

D

April

D

1972

R

May

E

1973

F

June

F

1974

G

July

G

1975

H

August

H

1976

J

September

J

1977

K

October

K

1978

L

November

L

1979

M

December

M

1980

N

1981

P

1982

Q

1983

R

1984

S

1985

T

1986

U

1987

V

1988

W

1989

X

1990

Y

1991

Z/A

The date codes from 1968 to 1991 are written in the form: Month, Year, Day. For example: KH7 = 7th October 1975

1992 -

YEAR

CODE

MONTH

CODE

1992

B

January

A

1992

V

February

B

1993

D

March

C

1995

E

April

D

1996

F

May

E

1997

G

June

F

1998

H

July

G

1999

J

August

H

2000

K

September

J

2001

L

October

K

2002

M

November

L

2003

N

December

M

2004

P

2005

Q

The date codes from 1992 are written in the form: Day, Month, Year. For example: 29EJ = 29th May 1999

The date codes from 1968 to 1991 are written in the form: Month, Year, Day. For example: KH7 = 7th October 1975

1992 -

YEAR

CODE

MONTH

CODE

1992

B

January

A

1992

V

February

B

1993

D

March

C

1995

E

April

D

1996

F

May

E

1997

G

June

F

1998

H

July

G

1999

J

August

H

2000

K

September

J

2001

L

October

K

2002

M

November

L

2003

N

December

M

2004

P

2005

Q

The date codes from 1992 are written in the form: Day, Month, Year. For example: 29EJ = 29th May 1999

what i cant tell from the G12Hs there 25 watts so use the date between 1972 till earlier, and if you cant find the date code on the chassis its on the gaskets meaning you will have to take out the speaker.... be very careful.

as for the G12Ms they are 25w too so there post 1972 so use between 1968 and 1991

Let me know when youve worked it out
Cheers

07-08-2008, 11:52 AM	#14 (permalink)
Pearse Member Join Date: Jun 2008 Location: Ireland Posts: 39	Re: Cabinet Identification Hey man see if this helps looks like the cab is of all different dates or at least the speakers are. there still pretty old though. Since 1956, all Celestion chassis drivers have been stamped with a date code (2 numbers and 2 letters), denoting the exact date of manufacture. The codes are added on the production line and are placed on the speaker's housing leg or the magnet edge. The following lists provide an accurate record of the date codes used. 1956 - 1962 YEAR CODE MONTH CODE 1956 A January A 1957 B February B 1958 C March C 1959 D April D 1960 E May E 1961 F June F 1962 G July G August H September I October J November K December L The datecodes from 1956 to 1962 are written in the form: Day, Month, Year. For example: 15DE = 15th April 1960 1963 - 1967 YEAR CODE MONTH CODE 1963 H January A 1964 J February B 1965 K March C 1966 L April D 1967 M May E June F July G August H September J October K November L December M Note the loss of the 'I' from the month codes. The date codes from 1963 to 1967 are written in the form: Day, Month, Year. For example: 19MK = 19th December 1965 1968 - 1991 YEAR CODE MONTH CODE 1968 A January A 1969 B February B 1970 C March C 1971 D April D 1972 R May E 1973 F June F 1974 G July G 1975 H August H 1976 J September J 1977 K October K 1978 L November L 1979 M December M 1980 N 1981 P 1982 Q 1983 R 1984 S 1985 T 1986 U 1987 V 1988 W 1989 X 1990 Y 1991 Z/A The date codes from 1968 to 1991 are written in the form: Month, Year, Day. For example: KH7 = 7th October 1975 1992 - YEAR CODE MONTH CODE 1992 B January A 1992 V February B 1993 D March C 1995 E April D 1996 F May E 1997 G June F 1998 H July G 1999 J August H 2000 K September J 2001 L October K 2002 M November L 2003 N December M 2004 P 2005 Q The date codes from 1992 are written in the form: Day, Month, Year. For example: 29EJ = 29th May 1999 The date codes from 1968 to 1991 are written in the form: Month, Year, Day. For example: KH7 = 7th October 1975 1992 - YEAR CODE MONTH CODE 1992 B January A 1992 V February B 1993 D March C 1995 E April D 1996 F May E 1997 G June F 1998 H July G 1999 J August H 2000 K September J 2001 L October K 2002 M November L 2003 N December M 2004 P 2005 Q The date codes from 1992 are written in the form: Day, Month, Year. For example: 29EJ = 29th May 1999 what i cant tell from the G12Hs there 25 watts so use the date between 1972 till earlier, and if you cant find the date code on the chassis its on the gaskets meaning you will have to take out the speaker.... be very careful. as for the G12Ms they are 25w too so there post 1972 so use between 1968 and 1991 Let me know when youve worked it out Cheers