The following resources will provide you with good information how to date vintage Fender amps.

• http://www.superchamp.dk/papers/dating_fender_tube_amps.htm
• http://home.provide.net/~cfh/pots.html
• http://www.fender.com/en-NO/support/articles/amplifier-product-dating/

For the sake of convenience we have also listed the tube chart letter codes and the most common speakers codes in blackface and silverface amps.

Tube chart date code 

If you for example have a “PH” date code, that means the amp was produced in August 1966.

YEAR		MONTH
1951	A	January	A
1952	B	February	B
1953	C	March	C
1954	D	April	D
1955	E	May	E
1956	F	June	F
1957	G	July	G
1958	H	August	H
1959	I	September	I
1960	J	October	J
1961	K	November	K
1962	L	December	L
1963	M
1964	N
1965	O
1966	P
1967	Q
1968	R
1969	S

Speaker manufacturer codes

137  CTS

220  Jensen

328  Utah

465  Oxford

67  Eminence

For example, the speaker below is a Utah speaker with code 328 XXX.

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