JJ Electronic, s.r.o is a Slovak electronic component manufacturer, and one of the world's remaining producers of

vacuum tube A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. It ...

s. It is based in

Čadca Čadca (; until 1918 Čatca, Czača, , ) is a district town in northern Slovakia, near the border with Poland and the Czech Republic. Etymology The name is derived from a word ''čad'' (smoke, soot; Proto-Slavic: ''čadъ'', Slovak/ Czech: ''ča ...

, in the

Kysuce Kysuce is a traditional informal name of a region in north-western Slovakia, situated around the Kysuca, Kysuca river and bordering the Orava region in the east, Poland in the north and the Czech Republic in the west. It consists of two districts: ...

region of

Slovakia Slovakia, officially the Slovak Republic, is a landlocked country in Central Europe. It is bordered by Poland to the north, Ukraine to the east, Hungary to the south, Austria to the west, and the Czech Republic to the northwest. Slovakia's m ...

. Most of its products are audio receiving tubes, mainly used for guitar and hi-fi amplifiers. In technical terms, JJ produces

triode A triode is an electronic amplifier, amplifying vacuum tube (or ''thermionic valve'' in British English) consisting of three electrodes inside an evacuated glass envelope: a heated Electrical filament, filament or cathode, a control grid, grid ...

beam tetrode A beam tetrode, sometimes called a beam power tube, is a type of vacuum tube or vacuum tube, thermionic valve that has two grids and forms the electron stream from the cathode into multiple partially collimated beams to produce a low potentia ...

s and power

pentode A pentode is an electronic device having five electrodes. The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. The pentode (called a ''tri ...

s. Double

diode A diode is a two-Terminal (electronics), terminal electronic component that conducts electric current primarily in One-way traffic, one direction (asymmetric electrical conductance, conductance). It has low (ideally zero) Electrical resistance ...

vacuum tubes for full-wave AC-to-DC

rectifier A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as ''rectification'', since it "straightens" t ...

s are also produced. JJ also produces

electrolytic capacitor An electrolyte is a substance that conducts electricity through the movement of ions, but not through the movement of electrons. This includes most soluble Salt (chemistry), salts, acids, and Base (chemistry), bases, dissolved in a polar solven ...

s for higher-voltage purposes, generally for use in audio amplifiers. JJ also manufactures its own line of high-end audio amplifiers and guitar amplifiers. In 2015, the company sales amounted to EUR 8.5 million and net income came to EUR 3.8 million. Most production is exported to the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

History

Before 1989,

Tesla Tesla most commonly refers to: * Nikola Tesla (1856–1943), a Serbian-American electrical engineer and inventor * Tesla, Inc., an American electric vehicle and clean energy company, formerly Tesla Motors, Inc. * Tesla (unit) (symbol: T), the SI-d ...

was the main Czechoslovak producer of electron tubes. While Tesla vacuum tubes were exported all over the world, and were known for their quality, the company did not survive the change of economic system after 1989 in combination with the downturn in the vacuum tube market. JJ Electronic was founded in 1993 by Jan Jurco, using the old Tesla machinery for the manufacture of vacuum tubes. Eventually, JJ Electronic started to produce its own line of vacuum tubes and electrolytic capacitors, mainly targeted at high-end

audiophile An audiophile (from + ) is a person who is enthusiastic about high-fidelity sound reproduction. The audiophile seeks to achieve high sound quality in the audio reproduction of recorded music, typically in a quiet listening space in a room with ...

and

guitar amplifier A guitar amplifier (or amp) is an electronic amplifier, electronic device or system that strengthens the electrical signal from a Pickup (music technology), pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce so ...

applications.

Products

Small signal vacuum tubes * ECC81/12AT7, dual triode * ECC82/12AU7, dual triode * ECC83/12AX7, dual triode * ECC88/6DJ8, dual triode * 12BH7, dual triode *

5751 5751 is the designation for a low-voltage, low-noise avionics vacuum tube popular as a pre-amplification tube in guitar amplifiers. The 5751 is a modified version of the 12AX7 12AX7 (also known as ECC83) is a miniature dual-triode vacuum tube with ...

, low-noise dual triode *

EF86 The EF86 is a high transconductance sharp cutoff pentode vacuum tube with Noval (B9A) base for audio-frequency applications. It was introduced by the Mullard company in 1953 and was produced by Philips, Mullard, Telefunken, Valvo, and GEC amo ...

, sharp-cutoff pentode *

6SN7 6SN7 is a dual triode vacuum tube with an eight-pin Tube socket#Octal base, octal base. It provides a medium gain (20 dB). The 6SN7 is basically two 6J5 triodes in one envelope. History The 6SN7 was originally released in 1939. It was officia ...

, dual triode Power vacuum tubes *

300B In electronics, the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals. It measures high and wide, and the anode can dissipate 40 watts thermal. In the 19 ...

, directly heated power triode * 2A3, directly heated power triode *

EL34 The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, which was owned by Philips. The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output s ...

, power pentode *

EL84 The EL84 is a vacuum tube of the power pentode type. It is used in the power-output stages of audio amplifiers, most commonly now in guitar amplifiers, but originally in radios. The EL84 is smaller and more sensitive than the octal 6V6 that wa ...

, power pentode * 6V6, beam tetrode *

6L6GC 6L6 is the designator for a beam power tube introduced by Radio Corporation of America in April 1936 and marketed for application as a power amplifier for audio frequencies.J. F. Dreyer Jr."The Beam Power Output Tube" New York: McGraw-Hill, ''Ele ...

, beam tetrode *

5881 Tung-Sol was an American manufacturer of electronics, mainly Lamp (electrical component), lamps and vacuum tubes. History In 1904, the company started as a small business in New York City, with Harvey Wilson Harper and two brothers, Herbert E. ...

, beam tetrode *

6550 Tung-Sol was an American manufacturer of electronics, mainly Lamp (electrical component), lamps and vacuum tubes. History In 1904, the company started as a small business in New York City, with Harvey Wilson Harper and two brothers, Herbert E. ...

, beam tetrode * 6CA7, beam tetrode *

KT66 KT66 is the designator for a beam power tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937 and marketed for application as a power amplifier for audio frequencies and driver for radio frequencies.Editors "The New Valves" '' ...

, beam tetrode * KT77, beam tetrode *

KT88 The KT88 is a beam tetrode/kinkless tetrode (hence "KT") vacuum tube for Audio frequency, audio amplifier, amplification. Features The KT88 fits a standard eight-pin Tube socket#Octal base, octal socket and has similar pinout and applications a ...

, beam tetrode Rectifiers * GZ34, indirectly heated full-wave rectifier * 5U4GB, directly heated full-wave rectifier *5Y3, directly heated full-wave rectifier * EZ81, indirectly heated full-wave rectifier (noval base)

References

External links

* {{Authority control Guitar amplification tubes Manufacturing companies of Slovakia Companies of Slovakia Companies established in 1993 Slovak brands Vacuum tubes