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75-969: Albin Hagström began importing accordions from Germany and Italy in 1925 and founded "Firma Albin Hagström". Albin expanded his business with shops in Sweden , Norway and Denmark and in 1932 he started manufacturing accordions himself in Älvdalen. In 1936, Hagström hired two Italian accordion builders who helped to update and streamline the manufacturing process. In 1939 Hagström started to establish themselves in USA by opening "Hagstrom Music Company Inc." in Rockefeller Center in New York as well as "Albin Hagstrom Inc." in Jamestown . However, in 1940

150-411: A proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain : the ratio of output voltage, current, or power to input. An amplifier is defined as a circuit that has a power gain greater than one. An amplifier can be either a separate piece of equipment or an electrical circuit contained within another device. Amplification

225-455: A transformer where one winding is used to control the saturation of a magnetic core and hence alter the impedance of the other winding. They have largely fallen out of use due to development in semiconductor amplifiers but are still useful in HVDC control, and in nuclear power control circuitry due to not being affected by radioactivity. Negative resistances can be used as amplifiers, such as

300-646: A transmission line at input and output, especially RF amplifiers , do not fit into this classification approach. Rather than dealing with voltage or current individually, they ideally couple with an input or output impedance matched to the transmission line impedance, that is, match ratios of voltage to current. Many real RF amplifiers come close to this ideal. Although, for a given appropriate source and load impedance, RF amplifiers can be characterized as amplifying voltage or current, they fundamentally are amplifying power. Amplifier properties are given by parameters that include: Amplifiers are described according to

375-406: A vacuum tube or transistor . Negative feedback is a technique used in most modern amplifiers to increase bandwidth, reduce distortion, and control gain. In a negative feedback amplifier part of the output is fed back and added to the input in the opposite phase, subtracting from the input. The main effect is to reduce the overall gain of the system. However, any unwanted signals introduced by

450-690: A bipolar junction transistor can realize common base , common collector or common emitter amplification; a MOSFET can realize common gate , common source or common drain amplification. Each configuration has different characteristics. Vacuum-tube amplifiers (also known as tube amplifiers or valve amplifiers) use a vacuum tube as the active device. While semiconductor amplifiers have largely displaced valve amplifiers for low-power applications, valve amplifiers can be much more cost effective in high power applications such as radar, countermeasures equipment, and communications equipment. Many microwave amplifiers are specially designed valve amplifiers, such as

525-795: A broad spectrum of frequencies; however, they are usually not as tunable as klystrons. Klystrons are specialized linear-beam vacuum-devices, designed to provide high power, widely tunable amplification of millimetre and sub-millimetre waves. Klystrons are designed for large scale operations and despite having a narrower bandwidth than TWTAs, they have the advantage of coherently amplifying a reference signal so its output may be precisely controlled in amplitude, frequency and phase. Solid-state devices such as silicon short channel MOSFETs like double-diffused metal–oxide–semiconductor (DMOS) FETs, GaAs FETs , SiGe and GaAs heterojunction bipolar transistors /HBTs, HEMTs , IMPATT diodes , and others, are used especially at lower microwave frequencies and power levels on

600-408: A higher bandwidth to be achieved than could otherwise be realised even with the same gain stage elements. These nonlinear amplifiers have much higher efficiencies than linear amps, and are used where the power saving justifies the extra complexity. Class-D amplifiers are the main example of this type of amplification. A negative resistance amplifier is a type of regenerative amplifier that can use

675-561: A large gain, and the output performance of the system (the "closed loop performance ") is defined entirely by the components in the feedback loop. This technique is used particularly with operational amplifiers (op-amps). Non-feedback amplifiers can achieve only about 1% distortion for audio-frequency signals. With negative feedback , distortion can typically be reduced to 0.001%. Noise, even crossover distortion, can be practically eliminated. Negative feedback also compensates for changing temperatures, and degrading or nonlinear components in

750-436: A real-world example: Production runs 706, 707, 708, 709, 711, 712, 713, 714, 715, 716, and 718 are verified to have all started in 1967. It can then be predicted that runs 710 and 717 also started in 1967, if those runs occurred. The likelihood of the start date being consistent relative to those adjacent to it is considered high but caution should be used as this may not always have been true. 7. Any serial number beginning with

825-551: A respected New York luthier brought in by Hagström to design the guitar). Basses include The Swede Bass and the Hagström H8 – the first ever mass-produced eight stringed bass guitar, which found fame when used by the likes of Noel Redding , Jimi Hendrix , Mike Rutherford , and others. Another innovation was the H-Expander Truss Rod, which gives the neck additional strength allowing it to be unusually thin. Thus

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900-445: A signal chain (the output stage) and is the amplifier stage that requires attention to power efficiency. Efficiency considerations lead to the various classes of power amplifiers based on the biasing of the output transistors or tubes: see power amplifier classes below. Audio power amplifiers are typically used to drive loudspeakers . They will often have two output channels and deliver equal power to each. An RF power amplifier

975-409: A single chip thereby creating higher scales of integration (such as small-scale, medium-scale and large-scale integration ) in integrated circuits . Many amplifiers commercially available today are based on integrated circuits. For special purposes, other active elements have been used. For example, in the early days of the satellite communication , parametric amplifiers were used. The core circuit

1050-514: Is found in radio transmitter final stages. A servo motor controller amplifies a control voltage to adjust the speed of a motor, or the position of a motorized system. An operational amplifier is an amplifier circuit which typically has very high open loop gain and differential inputs. Op amps have become very widely used as standardized "gain blocks" in circuits due to their versatility; their gain, bandwidth and other characteristics can be controlled by feedback through an external circuit. Though

1125-604: Is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment. Amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified. For example, audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz, and servo amplifiers and instrumentation amplifiers may work with very low frequencies down to direct current. Amplifiers can also be categorized by their physical placement in

1200-464: Is known for having one of the largest Hagström collections in America and reportedly claimed that Hagströms are the most roadworthy guitars he's ever used. The world's largest collection of Hagström guitars was previously owned by Arne Johansson in Östersund, Sweden and consisted of more than 80 Hagström guitars plus a number of amplifiers and other instruments and Hagström products. The entire collection

1275-409: Is most often configured to provide amplification of a voltage applied between base and emitter, and the output signal taken between collector and emitter is inverted, relative to the input. The common collector arrangement applies the input voltage between base and collector, and to take the output voltage between emitter and collector. This causes negative feedback, and the output voltage tends to follow

1350-413: Is said to have a gain of 20 dB might have a voltage gain of 20 dB and an available power gain of much more than 20 dB (power ratio of 100)—yet actually deliver a much lower power gain if, for example, the input is from a 600 Ω microphone and the output connects to a 47  kΩ input socket for a power amplifier. In general, the power amplifier is the last 'amplifier' or actual circuit in

1425-402: Is the device that does the actual amplification. The active device can be a vacuum tube , discrete solid state component, such as a single transistor , or part of an integrated circuit , as in an op-amp . Transistor amplifiers (or solid state amplifiers) are the most common type of amplifier in use today. A transistor is used as the active element. The gain of the amplifier is determined by

1500-399: Is the sequence number within that production run. 3. Hagstrom did keep detailed records for each unit produced, and there is a book to that effect but not widely available. you may want to seek it out. Without the book you may be able to determine the year however. Here are some real-world examples: a. Some serial numbers reveal a clear-cut result. For example, serial number 618324 is from

1575-430: Is useful. Certain signal processing applications use exponential gain amplifiers. Amplifiers are usually designed to function well in a specific application, for example: radio and television transmitters and receivers , high-fidelity ("hi-fi") stereo equipment, microcomputers and other digital equipment, and guitar and other instrument amplifiers . Every amplifier includes at least one active device , such as

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1650-480: The Class-D amplifier . In principle, an amplifier is an electrical two-port network that produces a signal at the output port that is a replica of the signal applied to the input port, but increased in magnitude. The input port can be idealized as either being a voltage input, which takes no current, with the output proportional to the voltage across the port; or a current input, with no voltage across it, in which

1725-467: The Super Swede founded Amtech which is producing PA systems and light rigs as well as computer equipment. The original "AB Albin Hagström" company still exists to this day and still owns many of the facilities in Sweden , Norway and Denmark . In 1958, Swedish -based Hagström started manufacturing electric guitars , being one of the first to produce the instrument professionally outside of

1800-629: The United States . The early Hagström Deluxe solid body guitars featured a distinctive sparkle and pearloid celluloid finish that was previously used on their line of accordions . Soon Hagström expanded their line-up of guitars to include hollow bodies like the Viking and the Jimmy. In 1961 the first line of Hagström basses was available to the public, this eventually came to include the groundbreaking 8 string bass. Models of electric guitar included

1875-475: The bipolar junction transistor (BJT) in 1948. They were followed by the invention of the metal–oxide–semiconductor field-effect transistor (MOSFET) by Mohamed M. Atalla and Dawon Kahng at Bell Labs in 1959. Due to MOSFET scaling , the ability to scale down to increasingly small sizes, the MOSFET has since become the most widely used amplifier. The replacement of bulky electron tubes with transistors during

1950-412: The klystron , gyrotron , traveling wave tube , and crossed-field amplifier , and these microwave valves provide much greater single-device power output at microwave frequencies than solid-state devices. Vacuum tubes remain in use in some high end audio equipment, as well as in musical instrument amplifiers , due to a preference for " tube sound ". Magnetic amplifiers are devices somewhat similar to

2025-503: The signal chain ; a preamplifier may precede other signal processing stages, for example, while a power amplifier is usually used after other amplifier stages to provide enough output power for the final use of the signal. The first practical electrical device which could amplify was the triode vacuum tube , invented in 1906 by Lee De Forest , which led to the first amplifiers around 1912. Today most amplifiers use transistors . The first practical prominent device that could amplify

2100-514: The tunnel diode amplifier. A power amplifier is an amplifier designed primarily to increase the power available to a load . In practice, amplifier power gain depends on the source and load impedances , as well as the inherent voltage and current gain. A radio frequency (RF) amplifier design typically optimizes impedances for power transfer, while audio and instrumentation amplifier designs normally optimize input and output impedance for least loading and highest signal integrity. An amplifier that

2175-415: The 1960s and 1970s created a revolution in electronics, making possible a large class of portable electronic devices, such as the transistor radio developed in 1954. Today, use of vacuum tubes is limited to some high power applications, such as radio transmitters , as well as some musical instrument and high-end audiophile amplifiers. Beginning in the 1970s, more and more transistors were connected on

2250-833: The Hagström 1, the H series (h II, h III, h II N), the Swede (Originally called The Hagström LP, or Les Paul, due to the instrument's resemblance to the popular Les Paul manufactured by Gibson Guitars ), the Super Swede, the Impala, the Corvette (called the Condor in the US), the Viking , the Swede Patch 2000 (one of the first synthesizer guitars) and the Jimmy (named for Jimmy D'Aquisto ,

2325-625: The Swedish market. His idea took off, and the demand for the Italian-made Hagström instruments was constantly growing. Hagström made several trips to Italy to develop new accordions, and at the same time learned the business. Problems with deliveries and increasing concerns about the European currency market resulted in Hagström investing in his own manufacturing in 1932, and he opened his first accordion factory in Älvdalen. Over

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2400-471: The US with establishing their Line O guitars. In 1967 he took over as CEO of the company. In their native Sweden, the company became well known not only for selling music hardware, but also for "teach-yourself" books and mail courses on electric guitar, bass, keyboards etc., learning tools that deliberately took in a rock and pop repertory, chord analysis and tuning apart from teaching how to read music. By recognizing

2475-487: The accordion production reached its peak with 15,000 units being built. At this time the company also started a number of accordion schools; it is estimated that over 70,000 people have attended these schools. Founder Albin Hagström died in 1952 at the age 47 and was succeeded by Erik Wisén . In 1968 the Super Cromatic was introduced which came to be the last accordion built, with the last one made in 1970. In 1984

2550-454: The action can be set lower than guitar necks built with traditional truss rods. Beside their line of instruments Hagström also produced amplifiers , speakers , effects units , guitar strings and mixing consoles , which were used by ABBA on their first world tour. A very small run of lap steels , banjos and mandolins were also built but are rare to come across. In 1962 Albin's son, Karl-Erik Hagström returned from working five years in

2625-451: The amplifier specifications and size requirements microwave amplifiers can be realised as monolithically integrated, integrated as modules or based on discrete parts or any combination of those. The maser is a non-electronic microwave amplifier. Instrument amplifiers are a range of audio power amplifiers used to increase the sound level of musical instruments, for example guitars, during performances. An amplifier's tone mainly comes from

2700-447: The amplifier, such as distortion are also fed back. Since they are not part of the original input, they are added to the input in opposite phase, subtracting them from the input. In this way, negative feedback also reduces nonlinearity, distortion and other errors introduced by the amplifier. Large amounts of negative feedback can reduce errors to the point that the response of the amplifier itself becomes almost irrelevant as long as it has

2775-591: The company AB Albin Hagström in 1925 and built up a business empire based on manufacturing and selling accordions. The Hagström brand became internationally known and respected. After importing and selling accordions for a few years, the Albin Hagström company was registered in 1925. The company was headquartered in Älvdalen . With the help of newspaper ads, Hagström continually found new business opportunities, and he began working with Italian accordion manufacturers to develop an accordion especially designed for

2850-416: The company returned to its roots by once again importing accordions from Germany and Italy . The shops were sold, and employees were encouraged to venture out on their own, which resulted in two new companies in Älvdalen . Musitech was started by Hagstrom and sold to Rolf Lindhamn , who was the official Swedish retailer of Aria and Guild guitars. Per-Åke Olsson who participated in the development of

2925-419: The company were outpriced by other major guitar brands that had moved their stock production lines to Asia. Hagström did make some Japanese prototypes; however, they were not pleased with the workmanship and would rather close down the company than cheapen the brand. The interest in the original Hagström brand still has a cult following around the world and a Hagström Festival takes place in Älvdalen, Sweden around

3000-669: The components in the feedback loop. Negative feedback can be applied at each stage of an amplifier to stabilize the operating point of active devices against minor changes in power-supply voltage or device characteristics. Some feedback, positive or negative, is unavoidable and often undesirable—introduced, for example, by parasitic elements , such as inherent capacitance between input and output of devices such as transistors, and capacitive coupling of external wiring. Excessive frequency-dependent positive feedback can produce parasitic oscillation and turn an amplifier into an oscillator . All amplifiers include some form of active device: this

3075-428: The digits "500" indicates the model is a prototype. in the mid 70's as a jazz guitar in this run. As of 2004, Hagström has been reopened for the international market being distributed by "Tricor AB". They are marketing new versions of a great number of the more famous models from Sweden. The official Hagström design team have taken certain liberties with the designs and made some improvements and other deviations from

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3150-409: The distortion levels to be greatly reduced, at the cost of lower gain. Other advances in the theory of amplification were made by Harry Nyquist and Hendrik Wade Bode . The vacuum tube was virtually the only amplifying device, other than specialized power devices such as the magnetic amplifier and amplidyne , for 40 years. Power control circuitry used magnetic amplifiers until the latter half of

3225-424: The electric guitar as an instrument in its own right, and not just an amped-up version of the acoustic and by accepting the new repertory, Hagström popularized the instrumental skills of the new music outside of the networks associated with rock clubs, and record shops, and at a time when rock music was barely ever being written about from a musical perspective. Production ended for Swedish-made Hagströms in 1983 as

3300-449: The feedback between the transistor's source and gate to transform a capacitive impedance on the transistor's source to a negative resistance on its gate. Compared to other types of amplifiers, a negative resistance amplifier will require only a tiny amount of power to achieve very high gain, maintaining a good noise figure at the same time. Video amplifiers are designed to process video signals and have varying bandwidths depending on whether

3375-525: The first computers . For 50 years virtually all consumer electronic devices used vacuum tubes. Early tube amplifiers often had positive feedback ( regeneration ), which could increase gain but also make the amplifier unstable and prone to oscillation. Much of the mathematical theory of amplifiers was developed at Bell Telephone Laboratories during the 1920s to 1940s. Distortion levels in early amplifiers were high, usually around 5%, until 1934, when Harold Black developed negative feedback ; this allowed

3450-437: The first week of June every year since 2006. 1. Hagstrom used a 6 or 7digit serial number on production (1963–1983) electric guitar and bass models. 2. The first 3 digits of the serial number indicate the manufacturing Production Run number. The remainder of the number is the sequence number for that unit (guitar or bass) within the production run. The format is PPPNNNN where PPP is the production run number and NNN or NNNN

3525-469: The four types of dependent source used in linear analysis, as shown in the figure, namely: Each type of amplifier in its ideal form has an ideal input and output resistance that is the same as that of the corresponding dependent source: In real amplifiers the ideal impedances are not possible to achieve, but these ideal elements can be used to construct equivalent circuits of real amplifiers by adding impedances (resistance, capacitance and inductance) to

3600-446: The gain stage, but any change or nonlinearity in the components in the feedback loop will affect the output. Indeed, the ability of the feedback loop to define the output is used to make active filter circuits . Another advantage of negative feedback is that it extends the bandwidth of the amplifier. The concept of feedback is used in operational amplifiers to precisely define gain, bandwidth, and other parameters entirely based on

3675-427: The input and output. For any particular circuit, a small-signal analysis is often used to find the actual impedance. A small-signal AC test current I x is applied to the input or output node, all external sources are set to AC zero, and the corresponding alternating voltage V x across the test current source determines the impedance seen at that node as R = V x / I x . Amplifiers designed to attach to

3750-537: The launch was canceled due to World War II and the people hired to run the company disappeared with the company's funds. In 1946 Sven Hillring was sent over from Sweden to oversee a new launch of the new accordion factory in Jamestown, which was in business until 1949. Back in Sweden the brand continued to grow throughout the 1940s and 1950s and at one time had a total of forty-eight shops in northern Europe . In 1953

3825-436: The neck is joined to the body. There are instances where the serial number appeared on the input jack plate (seen on a Hagstrom Swede from 1973)as well. This may have been common and an alternative serial number location. 5. In 1975/76 the numbers “53” were added as a prefix to the serial number (53 PPPNNNN) and should be ignored for decoding purposes. 6. Production run numbers are in general sequential with some exceptions. In

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3900-560: The need to increase the amplitude of electrical signals to extend the transmission of signals over increasingly long distances. In telegraphy , this problem had been solved with intermediate devices at stations that replenished the dissipated energy by operating a signal recorder and transmitter back-to-back, forming a relay , so that a local energy source at each intermediate station powered the next leg of transmission. For duplex transmission, i.e. sending and receiving in both directions, bi-directional relay repeaters were developed starting with

3975-733: The next 20 years, Hagström's company became one of the world's largest accordion producers, and the company constantly expanded until Hagström's death. It established factories internationally, including in the United States. A music school was started in connection with the business chain Hagström Musik, which became the model for municipal music schools. Hagström died of sepsis in Stockholm . The Albin Hagström Memorial Award , conferred from 1997 to 2006,

4050-554: The order and amount in which it applies EQ and distortion. One set of classifications for amplifiers is based on which device terminal is common to both the input and the output circuit. In the case of bipolar junction transistors , the three classes are common emitter, common base, and common collector. For field-effect transistors , the corresponding configurations are common source, common gate, and common drain; for vacuum tubes , common cathode, common grid, and common plate. The common emitter (or common source, common cathode, etc.)

4125-512: The order of watts specifically in applications like portable RF terminals/ cell phones and access points where size and efficiency are the drivers. New materials like gallium nitride ( GaN ) or GaN on silicon or on silicon carbide /SiC are emerging in HEMT transistors and applications where improved efficiency, wide bandwidth, operation roughly from few to few tens of GHz with output power of few watts to few hundred of watts are needed. Depending on

4200-536: The original Swedish designs. Hagström has again started the production of more exclusive Hagstrom guitars within Europe, which have been specially developed to reproduce the sounds of the originals. These models are called the Northen Series. The Northen series instruments are no longer in production. Ever since 1983, when original production stopped, Hagströms have been sought-after collectors' items. Pat Smear

4275-447: The output is proportional to the current through the port. The output port can be idealized as being either a dependent voltage source , with zero source resistance and its output voltage dependent on the input; or a dependent current source , with infinite source resistance and the output current dependent on the input. Combinations of these choices lead to four types of ideal amplifiers. In idealized form they are represented by each of

4350-414: The outputs of which are summed by the same transmission line. The transmission line is a balanced type with the input at one end and on one side only of the balanced transmission line and the output at the opposite end is also the opposite side of the balanced transmission line. The gain of each stage adds linearly to the output rather than multiplies one on the other as in a cascade configuration. This allows

4425-454: The production run 618 which consisted of 1000 Hagstrom II guitars started and completed in 1964. Therefore, all units with a 618NNNN serial number are from the year 1964. b. However, others are less clear. For example, serial number 680873 is a Viking V-1 and the 873rd guitar made in production run 680. That run started in 1965 and completed in 1966. 1000 units were made in that run, so it is impossible with existing records to know if this guitar

4500-571: The properties of the transistor itself as well as the circuit it is contained within. Common active devices in transistor amplifiers include bipolar junction transistors (BJTs) and metal oxide semiconductor field-effect transistors (MOSFETs). Applications are numerous. Some common examples are audio amplifiers in a home stereo or public address system , RF high power generation for semiconductor equipment, to RF and microwave applications such as radio transmitters. Transistor-based amplification can be realized using various configurations: for example

4575-422: The properties of their inputs, their outputs, and how they relate. All amplifiers have gain, a multiplication factor that relates the magnitude of some property of the output signal to a property of the input signal. The gain may be specified as the ratio of output voltage to input voltage ( voltage gain ), output power to input power ( power gain ), or some combination of current, voltage, and power. In many cases

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4650-410: The property of the output that varies is dependent on the same property of the input, making the gain unitless (though often expressed in decibels (dB)). Most amplifiers are designed to be linear. That is, they provide constant gain for any normal input level and output signal. If an amplifier's gain is not linear, the output signal can become distorted . There are, however, cases where variable gain

4725-418: The term today commonly applies to integrated circuits, the original operational amplifier design used valves, and later designs used discrete transistor circuits. A fully differential amplifier is similar to the operational amplifier, but also has differential outputs. These are usually constructed using BJTs or FETs . These use balanced transmission lines to separate individual single stage amplifiers,

4800-508: The twentieth century when power semiconductor devices became more economical, with higher operating speeds. The old Shreeve electroacoustic carbon repeaters were used in adjustable amplifiers in telephone subscriber sets for the hearing impaired until the transistor provided smaller and higher quality amplifiers in the 1950s. The first working transistor was a point-contact transistor invented by John Bardeen and Walter Brattain in 1947 at Bell Labs , where William Shockley later invented

4875-462: The video signal is for SDTV, EDTV, HDTV 720p or 1080i/p etc. The specification of the bandwidth itself depends on what kind of filter is used—and at which point ( −1 dB or −3 dB for example) the bandwidth is measured. Certain requirements for step response and overshoot are necessary for an acceptable TV image. Traveling wave tube amplifiers (TWTAs) are used for high power amplification at low microwave frequencies. They typically can amplify across

4950-478: The work of C. F. Varley for telegraphic transmission. Duplex transmission was essential for telephony and the problem was not satisfactorily solved until 1904, when H. E. Shreeve of the American Telephone and Telegraph Company improved existing attempts at constructing a telephone repeater consisting of back-to-back carbon-granule transmitter and electrodynamic receiver pairs. The Shreeve repeater

5025-461: Was a diode whose capacitance was changed by an RF signal created locally. Under certain conditions, this RF signal provided energy that was modulated by the extremely weak satellite signal received at the earth station. Advances in digital electronics since the late 20th century provided new alternatives to the conventional linear-gain amplifiers by using digital switching to vary the pulse-shape of fixed amplitude signals, resulting in devices such as

5100-433: Was actually made in 1965 or made in 1966. We know that this sequence number (873) is a high number in relation to the total of 1000 guitars produced in the run. We can therefore make the guess that it was most likely produced in 1966. The best that can be said in this instance is that the actual manufacture date is no earlier than 1965 and no later than 1966. 4. Serial numbers were etched on the guitar neck backing plate where

5175-617: Was bought by the publicly owned museum of the Dalarna province, that owned a smaller collection of instruments, on 4 May 2012. Their collection now consists of more than 100 Hagström guitars. The red Viking II that Elvis Presley played on Elvis Presley's '68 Comeback Special was sold in the early nineties for more than $ 50,000 and was on display at the Museum of Modern Art in New York. A 1981 Super Swede with custom blue and yellow graphics

5250-447: Was first tested on a line between Boston and Amesbury, MA, and more refined devices remained in service for some time. After the turn of the century it was found that negative resistance mercury lamps could amplify, and were also tried in repeaters, with little success. The development of thermionic valves which began around 1902, provided an entirely electronic method of amplifying signals. The first practical version of such devices

5325-424: Was named after Hagström. Amplifier An amplifier , electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current ). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input terminals, producing

5400-610: Was sold for 60,100 Swedish kronor (approx. US$ 8,850), making it one of the most expensive Hagströms ever sold. The Guitar Collection features a rare Hagström Futurama Coronado automatic. [REDACTED] Media related to Hagström at Wikimedia Commons Albin Hagstr%C3%B6m Albin Hagström (May 25, 1905 in Orsa – April 3, 1952) was a Swedish entrepreneur. Hagström was born in Orsa, Sweden . Hagström

5475-851: Was the Audion triode , invented in 1906 by Lee De Forest , which led to the first amplifiers around 1912. Since the only previous device which was widely used to strengthen a signal was the relay used in telegraph systems, the amplifying vacuum tube was first called an electron relay . The terms amplifier and amplification , derived from the Latin amplificare , ( to enlarge or expand ), were first used for this new capability around 1915 when triodes became widespread. The amplifying vacuum tube revolutionized electrical technology. It made possible long-distance telephone lines, public address systems , radio broadcasting , talking motion pictures , practical audio recording , radar , television , and

5550-432: Was the triode vacuum tube , invented in 1906 by Lee De Forest , which led to the first amplifiers around 1912. Vacuum tubes were used in almost all amplifiers until the 1960s–1970s when transistors replaced them. Today, most amplifiers use transistors, but vacuum tubes continue to be used in some applications. The development of audio communication technology in form of the telephone , first patented in 1876, created

5625-511: Was the father of Karl-Erik Hagström (his business successor in 1961), Kärstin Hagström-Heikkinen, Lars Hagström, and Anna-Lehna Hagström. Albin Hagström learned to play the accordion at an early age, and he started performing at local dances and parties. In 1921 he bought two German accordions. He then sold one of them, and he rented out the other one to local musicians. These were the roots of his industrial career. Hagström founded

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