Dating vintage fender speakers
The resulting negatively-charged cloud of electrons is called a space charge.These electrons will be drawn to a metal "plate" inside the envelope if the plate (also called the anode) is positively charged relative to the filament (or cathode).
Another method of dating a tweed Fender Champ is by serial number.
Other configurations are also possible including the Pentode, a tube with 5 active elements providing an additional amplification factor.
There are a large number of tube varieties and uses.
From 1969 to 1983 the date code was after the serial number.
From 1984 to 1992 the model number was first, then the date code, then the serial number.
A=1969 A=1970C=1971 D=1972E=1973 F=1974 G=1975 H=1976 J=1977 K=1978 L=1979 M=1980 N=1981 P=1982 R=1983 S=1984 T=1985 U=1986 V=1987 W=1988 X=1989 Y=1990 Z=1991 Z=1992 Disclaimer: These charts are for informational purposes only and are not a substitute for consulting your amp tube chart, amp repair shop and amp manufacturers instructions.
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