- 1). Power down the amplifier. Disconnect all instrument and audio cables from the amp. Move the amp to a flat work table.
- 2). Rotate the amplifier so the back side is facing you. Remove the Phillips-head screws securing the amp's back panel in place. Carefully remove the back panel to reveal the inside of the amplifier.
- 3). Locate the amplifier's tube chart inside the speaker cabinet near the tube assembly. Look for the four- to six-digit serial number printed on the tube chart.
- 4). Use the following chart to match the serial number to the appropriate manufacturing year:
5500 to 6600 - 1953
6600 to 8000 - 1954
8000 to 9999 - 1955
C00001 to C00800 - 1955
C00800 to C03100 - 1956
C03100 to C06000 - 1957
C06000 to C08800 - 1958
C08800 to C12500 - 1959
C12500 to C15500 - 1960
C15500 to C16800 - 1961
C17000 to C19000 - 1962
C19000 to C21000 - 1963
C21000 to C23000 - 1964
A00100 to A02000 - 1964
A01900 to A05200 - 1965
A05200 to A12000 - 1966
A12000 to A12200 - 1967
A12200 to A13900 - 1968
A13900 to A18000 - 1969
A18000 to A30500 - 1970
A30500 to A32000 - 1971
A32000 to A35000 - 1972
A32000 to A42000 - 1973
A42000 to A50000 - 1974
A50000 to A63000 - 1975
A63000 to A85000 - 1976
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