Dating a fender bassman 100

However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.In it's simplest form a vacuum tube can be created to operate as a diode: a device that conducts current only in one direction.A third element called a "control grid" can be added to the design which provides the ability to amplify a signal.

Although the envelope was classically glass, power tubes often use ceramic and metal.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.We are not responsible for typographical errors, inaccuracies and omissions on this web site.The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.When hot, the filament releases electrons into the vacuum: a process called thermionic emission.

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As usual the later silverface models were modified to become cleaner and more powerful.

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