beam power amplifier working model
Date1943
Inventory NumberVT1170
ClassificationVacuum Tube
Subject
Maker
Robert Forsberg
1919 - 2006
Cultural Region
Place of Origin
Dimensions12 × 3.8 × 3.8 cm (4 3/4 × 1 1/2 × 1 1/2 in.)
Material
DescriptionA model 6L6 beam power amplifier on which the identity of the elements inside has been marked. The arrangement inside is cyllindrical with a heated cathode at the center, followed by two wire screens (the "grid" and "screen") and then a metallic plate. There are some additional plates inside the configuration ("deflection plates").
Signedunsigned
Inscribedon top: 6L6 BEAM POWER AMPLIFIER
on bulb near each corresponding element: PLATE, CATHODE, GRID, SCREEN, BEAM DEFLECTION PLATES
Curatorial RemarksMADE BY R.FORSBERG'41 FOR ELC
FunctionThis was a working beam power amplifier on which all its have been marked for didactical purposes. All of the elements except for the deflection plates would be found in any tetrode or pentode.
Like in a standard triode in this tube electrons are produced by the heated cathode and accelerated towards the anode (plate) maintaining an electric current. This current can be controlled by placing a metallic grid between them and varying its voltage. One can amplify a weak signal connecting the grid to the signal. A tetrode improves this design by having an additional grid ("screen") between the grid and the anode, and solves a distortion by the so-called Miller effect that increases the effective capacitance of the system and thus alters its high-frequency performance.
A beam power tetrode would have the same elements as a standard tetrode, but in addition to these there would be additional plates in the configuration at the same potential as the cathode in order to direct the electron beam towards the anode, making more efficient use of the produced electrons. They could handle larger loads that a standard amplifier of a similar size.
Like in a standard triode in this tube electrons are produced by the heated cathode and accelerated towards the anode (plate) maintaining an electric current. This current can be controlled by placing a metallic grid between them and varying its voltage. One can amplify a weak signal connecting the grid to the signal. A tetrode improves this design by having an additional grid ("screen") between the grid and the anode, and solves a distortion by the so-called Miller effect that increases the effective capacitance of the system and thus alters its high-frequency performance.
A beam power tetrode would have the same elements as a standard tetrode, but in addition to these there would be additional plates in the configuration at the same potential as the cathode in order to direct the electron beam towards the anode, making more efficient use of the produced electrons. They could handle larger loads that a standard amplifier of a similar size.
Martin J. Buerger
Date: 1945-1960
Object number: 1998-1-1673a
Rudolph Rothe
Date: circa 1893
Accessories: lenses and reflectors
Object number: WJ0033
Martin J. Buerger
Date: 1941-1944
Accessories: film holder (a); metal screen (b); small rectangular metal counterweight (c)
Object number: 1996-1-0185
Raytheon Manufacturing Company
Date: 1949-1950
Object number: VT0101
Polaroid Corporation
Date: 2003
Accessories: printer ribbon, power cable, adapter cable, original packing materials, instruction manuals (in object file), and gray card (in object file)
Object number: 2009-1-0039
Apple Computer Inc.
Date: 1987-1990
Accessories: AppleDesign keyboard; Logitech mouse (not original); connection cables (b)
Object number: 2009-1-0018a
See also/See also
