By admin
http://www.cwhdallas.com/double-tetrode/
Double Tetrode
 |
Manley Labs Neo-Classic 250 Watt Monoblock Amplifier
List Price: $12,500.00
Sale Price: $9,000.00
|
|
|
Input sensitivity: 1V
Gain: 32dB tetrode; 30dB in triode
Input Impedance RCA: 116 Kohm @ 1KHz
Input Impedance XLR: 270Kohm @ 1KHz; 20Kohms @ 20KHz; 38Kohm @ 20Hz
Noise Floor: Tetrode: -67dB; Triode -65dB typical
S/N Ratio: -80 dB
Dynamic Range: 96dB
Flat frequency response: 10 Hz - 30 KHz continuous
Power Consumption: 30 Watts in "Ever-Warm"
Full power (tetrode): 500W
Full power (triode): 275W
Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.
Mains Voltage Frequency: 50~ 60Hz
Dims: W=19", D=13", H=9"
Shipping weight: 82 lbs. each
|
About Tube packages
Most modern tubes have glass envelopes, but metal, fused quartz (silica), and ceramic have also been used. The first version of the 6L6 used a metal envelope sealed with glass beads, while a glass disk fused to the metal was used in later versions. Metal and ceramic are used almost exclusively for power tubes above 2 kW dissipation. The nuvistor was a modern receiving tube using a very small metal and ceramic package. where to buy cheap LED Strip? Lightereryday is a good choice.
Tubes have always had their internal elements connected to external circuitry using pins at their base which plug into a socket. After all, tubes needed to be replaced rather frequently unlike modern semiconductor devices which are mostly soldered in place. Subminiature tubes were produced using wire leads rather than sockets, however these were restricted to rather specialized applications. In addition to the connections at the base of the tube, many early triodes connected the grid using a metal cap at the top of the tube; this was done in order to reduce stray capacitance between the grid and the plate leads. Tube caps were also used for the plate (anode) connection, particularly in transmitting tubes and tubes using a very high plate voltage.
High power tubes such as transmitting tubes have packages designed more to enhance heat transfer. In some tubes, the metal envelope is also the anode. The 4CX1000A is an external anode tube of this sort. Air is blown through an array of fins attached to the anode, thus cooling it. Power tubes using this cooling scheme are available up to 150 kW dissipation. Above that level, water or water-vapor cooling are used. The highest-power tube currently available is the Eimac 4CM2500KG, a forced water-cooled power tetrode capable of dissipating 2.5 megawatts. (By comparison, the largest power transistor can only dissipate about 1 kilowatt.)
In many cases manufacturers and the military gave tubes designations which said nothing about their purpose (e.g., 1614). In the early days some manufacturers used proprietary names which might convey some information, but only about their products; the KT66 and KT88 were "Kinkless Tetrodes". Later, consumer tubes were given names which conveyed some information. In the US names comprise a number, followed by one or two letters, and a number. The first number is the (rounded) heater voltage; the letters designate a particular tube but say nothing about its structure; and the final number is the total number of electrodes (without distinguishing between, say, a tube with many electrodes, or two sets of electrodes in a single envelope—a double triode, for example). For example the 12AX7 is a double triode (two sets of three electrodes plus heater) with a 12.6V heater (which, as it happens, can also be connected to run from 6.3V). The "AX" has no meaning.
A system widely used in Europe known as the Mullard-Philips tube designation, also extended to transistors, uses a letter, followed by one or more further letters, and a number. The type designator specifies the heater voltage or current, the functions of all sections of the tube, the socket type, and of course identifies the particular tube. In this system special-quality tubes (e.g., for long-life computer use) are indicated by moving the number immediately after the first letter: the E83CC is a special-quality equivalent of the ECC83 (the European equivalent of the 12AX7), the E55L a power pentode with no consumer equivalent. recommend directory: 5050 SMD Flexible Strip with waterproof 5 Meter 300 LEDS.
Some special-purpose tubes are constructed with particular gases in the envelope. For instance, voltage regulator tubes contain various inert gases such as argon, helium or neon, and take advantage of the fact that these gases will ionize at predictable voltages. The thyratron is a special-purpose tube filled with low-pressure gas or mercury vapor. Like vacuum tubes, it contains a hot cathode and an anode, but also a control electrode which behaves somewhat like the grid of a triode. When the control electrode starts conduction, the gas ionizes after which the control electrode no longer can stop the current; the tube "latches" into conduction. Removing anode (plate) voltage lets the gas de-ionize, restoring its non-conductive state. Some thyratrons can carry large currents for their physical size. One example is the miniature type 2D21, often seen in 1950s jukeboxes as control switches for relays. A cold-cathode version of the thyratron, which uses a pool of mercury for its cathode, is called an ignitron; some can switch thousands of amperes. Thyratrons containing hydrogen have a very consistent time delay between their turn-on pulse and full conduction; they behave much like modern silicon-controlled rectifiers, also called thyristors due to their functional similarity to thyratrons. Thyratrons have long been used in radar transmitters.
An extremely specialized tube is the krytron, which is used for extremely precise and rapid high-voltage switching. Krytons with certain specifications are suitable to initiate the precise sequence of detonations used to set off a nuclear weapon, and are heavily controlled at an international level.
X-ray tubes are used in medical imaging among other uses. X-ray tubes used for continuous duty operation in fluoroscopy and CT imaging equipment may use a focused cathode and a rotating anode to dissipate the large amounts of heat thereby generated. They are housed in an aluminum housing which is filled with oil for cooling.
The photomultiplier tube is an extremely sensitive detector of light, which uses the photoelectric effect and secondary emission, rather than thermionic emission, to generate and amplify electrical signals. Nuclear medicine imaging equipment and liquid scintillation counters use photomultiplier tube arrays to detect low-intensity scintillation due to ionizing radiation. recommend directory: 48cm 30LEDS SMD3528 LED Light Bar.
About the Author
Welcome to LightEveryDay.com. Our company offer led lights,led strip, led ribbon, led car light, led power supply, led controller.High quality LED Strip with low price.
Thanks for visiting!
