The kt90 is a vacuum tube used in audio applications. Still most folks do not really need more than 40 to 45 watts of audio power. Be sure to click the additional info tab when viewing a specific kt88 kt90 kt120 tube. Kt90 is a beampower pentode primarly designed for use in audio. Each wound string is precision wrapped with round nickelplated steel onto a high carbon, hexagonshaped steel core.
The kt90 is a beampower pentode primarily designed for use in audio frequency power amplifier applications. It may therefore be used as a substitute, given appropriate rebiasing when used in pushpull configuration. In a v4b i would bet you could tell the difference between a 6l6, el34, or 7027. Tubes vary according to statistical parameters, just like other devices that are massproduced. Electroharmonix kt90 the electro harmonix kt90 eh tube is a dropin for any kt88 or 6550 tube. You can always sub a kt150 for a kt120 or kt90 but never the other way around. When used at the parameters found in existing 6550kt88 kt90 circuits, the tungsol kt120 is. Find great deals on ebay for tube kt90 and kt90 ei tube. For a collection of datasheets, follow the link to at the top menu.
The genalex gold lion kt88 reissue is the first of several tubes tubes to come from the genalex gold lion brand. With a goldplated molybdenum alloy grid and carbon coated screen grid, the svetlana kt88 is the finest power tube of its type be ing manufactured today. Most of the tubes will be in the center of the distribution, close to the optimal operating point of that tube. It offers the most power and bass response of the three tubes discussed in this thread. A pair of these tubes in pushpull configuration can deliver power levels of 150 watts or more. Kt90 datasheet, kt90 pdf, kt90 data sheet, kt90 manual, kt90 pdf, kt90, datenblatt, electronics kt90, alldatasheet, free, datasheet, datasheets, data sheet, datas. The svetlana 300b is a power triode intended for use in class a, ab or b audio amplifiers.
With an anode to anode load of 4,000 ohms and 550 volts on the anode a pair run in ultra linear ab1 will deliver 100 watts at 3. The kt90, kt120 and kt150 are all tubes that were designed in the modern era. The design was based on the 6l6gc tube with higher power ratings, and featured a coke bottle shaped envelope like the european kt66 tubes. New sensor now announces the tungsol kt120, which has a plate dissipation of 60 watts, making it the most powerful tube in the 6550kt88 kt90 family. We stock kt88 tube sets that are precision matched on our own custom equipment and hand selected by our staff for the best results. The electroharmonix kt88 has excellent tonality, with a full bodied sound, and great dynamics. As a result, kt88s and 6550s are produce cleaner tones and have low distortion, making it popular amongst bass amplifiers and high end audio applications.
In most cases you can use these tubes in place of kt88, but its best to check with your amp manufacturer first. The most common types of 6550 tubes and their european equivalents used today include. When its run in circuits designed for 6550kt88 kt90 tubes, the tungsol kt120 resists being overdriven and reliably delivers peak power. Compliance with eu material restrictions and reach article 33. Anode dissipation rate is 50w, which provides for pushpull amplifiers utilization up to 110w output per pair, with 550v on the anode. Design and construction of a pair of pushpull classa, ultralinear mono block tube amplifiers that can be used with several different power vacuum tubes including el34, kt77, 6l6gc, 6550, kt88, kt90. Kt120 pushpull tube amplifier schematic oddwatt audio obho. Kt90 is designed by blagomir bukumira,a leading engineer at ei features. Its exclusive screengrid radiator fins reduce a major source of. Up to 160w per pair may be achieved with anode voltage of 750v and screen grid. Anode dissipation rate is 50w, which provides for push. You will also notice we indicate the topsellers for the kt88, kt90, and kt120 audio tubes. This electrical spec enables to design powerful amplifiers without parallel connection. The kt90, or in full, kinkless tetrode 90, is a beam power tetrode and features the same octal socket as its smaller variant, the kt88.
A favorite among hifi audiophiles, provides excellent value for the price. Because of our tradition of supplying the highest quality tubes, we are proud that our ouput is the very best in the world for upgrade and replacement. The kt90 is recommended as a replacement for 6550, 6550a and kt88. The svetlana 300b uses ultrapure carbonized nickel plate material and a proprietary oxide coating on the. Ktbbtk tube data sheet mechanical type base number of pins heater requirements parameter heater voltage heater current a. Here youll find a modest collection of datasheets for some popular tubes.
The basic audio design will be basically the same, but there is only one choice of feedback. The new kt88 features greatly enhanced sonic performance. Kt88 beam power tetrode t he svetlana kt88 is a beam power tetrode having a large standard octal base and glass envelope. Kt90 page 1 of 5 the kt90 is a beampower pentode primarily designed for use in audio frequency power amplifier applications. Try searching the tube data sheet locator, the worlds biggest index of tube datasheets other pages online with tube data. The kt88 fits a standard eightpin octal socket and has similar pinout and applications as the 6l6 and el34. Kt90 note, larger 2 pages widefiles, about 80kbytes each. A pair of these tubes in pushpull configuration can deliver power levels of 150 or more watts. If you plot bias versus the number of tubes having that bias, youll see the classic gaussian distribution, or bell curve. They are all loosely based on the kt88 but with much more power. Electroharmonix owns 100% of the largest remaining vacuum factory in the world.
The kt88 is a beam tetrode k inkless t etrode hence kt vacuum tube for audio amplification. At the bottom of this page youll find some links to other tube datasheet sites in case you cant find what youre looking for here. Scroll down to see sets of 2 pair, 4 quad, and 6 sextet. Sonically they are true to the electo harmonix brand. All new sensor vacuum tubes electroharmonix, eh gold, genalex, mullard, sovtek, svetlana and tungsol meet all applicable rohs material restrictions and are reach compliant. The figures given are for single ended use, but the valve is almost invariably used in push pull pairs. Kt120 pushpull tube amplifier schematic oddwatt audio obho this kt120 tube amplifier is a follow on to the smaller oddwatt power amplifier. The kt90 is the largest nontriode ouput tube used in our hobby.
Vacuum tube kt90, electroharmonix antique electronic supply. This rugged tube also found a home in the 59 fender bassman and servo amplifiers used in. Also the most common electrical circuits are given for kt88 and 6550. The kt120 and kt150 are both pentode devices and the kt88 and kt100 are described as beam tetrodes so no, i wouldnt think these can be easily interchanged even though the data sheets have the same pinout. In september of 1950 tungsol introduced the 5881, an uprated and industrial version of the 6l6ga with a 23. Kt90 was developed by elektronska industrija nis ei. Power tubes 6550 kt88 kt120 kt150 tube basics and faq. Specifically designed for audio amplification, the kt88 has similar ratings to the american 6550 which was designed for use as a servo. Two valves in class ab1 give a continuous output of up to 100w. Kt88 and kt120 power tube compatibility test, electrical. The purpose of this kt88 kt66 6550 kt90 kt120 page is to give an overview about what kt66, kt88.
Increased, electron devices typical operation class a1 single tube dc plate voltage grid no. Tube kt 90 or rohre kt90 id31938, beam power tube, octal int. This amplifier was featured on the february 2004 issue of the highfidelity audio. Tubedepot carries a selection of 6550 kt88 kt90 power vacuum tubes. Our new ehx strings electroharmonix electric guitar strings are customdesigned to our specifications and made in the usa by a premiere string manufacturer. Net tube data here youll find manufacturers data sheets and curves for many popular and some not so popular electronic valve types. Oddblocks classa pushpull kt88 tube amplifier 12sl7. It will also incorporate an arduino microcontroller. It is one of the lowestdistortion tubes ever made, and is a close duplicate of the original western electrictm 300b. Gold lion kt88 made in england draft of new spec sheet 4302002 beam tetrode 63v indirectly heated the kt88 has an absolute maximum anode dissipation rating of 42w and is designed for use in the output stage of an a.
You might saturate the xfmr or affect other parts of the circuit maybe, but not the tubes as long as the bias and plate impedance are correct. The plain strings are made from the same high carbon steel as the hex cores. The kt88 is one of the few classic audio output valves. Kt120 datasheet, kt120 pdf, kt120 data sheet, kt120 manual, kt120 pdf, kt120, datenblatt, electronics kt120, alldatasheet, free, datasheet, datasheets, data sheet.
However, there is also a negative to this, it will not physically fit into many amplifiers, as it is too tall. With a plate dissipation of 60 watts, the tungsol kt120 is the most powerful tube in the 6550kt88 kt90 family. Vacuum tube kt90, electroharmonix electroharmonix kt90 power tube. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.
El156kt886550kt90 then kt120 single ended amplifier d. Kt90, kt120 and kt150 are higherpowered direct replacement of kt88. If you cant find what you need here, try duncans tube data sheet. Typically, it is used in hifi or electric guitar amplifier applications. Kt90 and types and brands exist, and what you can do with the this tube.