The pcb was based on a low cost triodepentode driver tube and 6l6 family of output tubes that are available around the world. How to replace many octal tube types with the new then miniature ones. The figures given are for single ended use, but the valve is almost invariably used in push pull pairs. Buy matched pair shuguang kt88 98 vacuum tube replace kt88 kt88 z 6550 kt88 t. Im also looking into building my first tube amp and have been looking for a. I use electro harmonic kt88s in my rogue m150 monoblocks. It has even less distortion and an even cleaner tone then the 6l6 or even the.
Full text of tube substitution handbook see other formats. The pcb also includes a tubebased power supply, using 5u4 or whatever tube you like, and snapmount capacitors on. In general, the kt88 tube has a magical midrange similar to the smaller el34 tube, but with low and high end extremes that reach much further. Up for sale will be one matched pair 2pcs of shuguang treasure vacuum tubes kt88z substitution of 6550, packed in environmental protection box as picture shown, product of shuguang electron group. Power tubes 6550 kt88 kt120 kt150 tube basics and faq. Like the svetlana, it has stood the test of time in reliability standards, but also it has certain sonic qualities that most tube and solid state audiophiles alike crave, e.
If your amp requires a kt88 tube for power these are a great replacement. The genalex kt88 is considered by many to be the finest of all kt88s made today. Apr 19, 2017 i see the following in craigs web site. This entry was posted in hifi and tagged 6sn7, amp, audio, kt88, tube by admin. I have run both kt88s and 6550cs in cary and audio research gear.
In the other substitution guides receiving tube substitution guidebook, the four supplements thereto, and the auencompassing master receivingpicture tube substi tution guidebook all substitutions are listed, including those which require rewiring and socket changes. Emphasis can be heard in the lower bass and highest highs. I promised to write something about these muchloved tubes after id put about 100 hours on them, so here we go. Kt77 vs kt88 talkin tubes the klipsch audio community. Theshuguang treasure as a result of shuguangs 50year of expertise in vacuum valve design and production. As a poster above said, the new sensor gec ri kt88 is a nice tube.
The northern electric kt88 audio tube is made with the highest quality materials, from the. Free vacuum tube data sheets free vacuum tube substitution. Its a more wide open tube than the tungsol ri 6550. Looking for help to choose kt88 tube steve hoffman music forums. Pushpull kt88 class a amp with universal driver pcb. The jj kt88 s also sound excellent in the hot rod 50, soldano amps. The new kt88 features greatly enhanced sonic performance. Ok i have the mc100b and read everything i could find on it. Basically any amp using 6550s can use the jj kt88 s. This ne w t ube s ub stitut io n guidebook tube substitution.
A kt88 will give you more top and bottom end at the expense of a more analytical mid range. Here is what the tube store in hamilton says about the 6550we and the kt88 power tubes. Kt88 s and 6550s cant deal with the high grid resistance from the 220k resistor typically found in an el34 bias circuit and the tubes could be destroyed. Already known as the bible of tubes and tube amps, the tube amp book is now even better. Jjs kt88 is a great replacement for guitar amps or hifi. These are burned in for 24 hours and then factory platinum. The shuguang kt8898 tube is of the same construction as what we have sold as the gold aero and penta type tubes. I also like the chinese kt88 for their sound but quality has been spotty to say the least. The new psvane kt88 t treasure kt88 z might be a good alternative. For the past year or so ive been very happily running os tung sol 6550s in my audio note kits kit 2 1 x 6550 per channel. Are kt88s interchangeable with el34s the gear page. The eat kt88 has a designed maximum anode dissipation rating of 35w and is recommended for. Svetlana technical data kt88 high performance audio beam.
What are your favorite new production kt88 and 6550 power. Can be used in place of 6550 for a more round bass signature. Sed kt88 high performance audio power tube the sed kt88 is a glass envelope beam power tetrode and is manufactured at the sed spb factory in st petersburg, russia. If you want the best, than right now it is the shuguang treasures. The kt88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. Nov, 2012 the pcb was based on a low cost triodepentode driver tube and 6l6 family of output tubes that are available around the world. So starting the design somewhere in 1994 i decided to design. The amps can run el34, 6l6gc, 5881, 350b, kt66, kt88, 6550, kt90 and more some tube choices require a 5u4gb rectifier tube fwiw, the kt88 is not my favorite output tube.
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. Comparing the psvane tll to penta lab, generic good shuguang and the great gold lion the psvane kt88ll is clearly the better tube. The kt88 is a beam tetrode k inkless t etrode hence kt vacuum tube for audio amplification. The shuguang kt88 98 tube is of the same construction as what we have sold as the gold aero and penta type tubes. The kt88 is based on the 6550 but even more refined and boosted. Kt88 vs el34 vs 6l6 substitution in vacuum tube amplifier.
The kt88 fits a standard eightpin octal socket and has similar pinout and applications as the 6l6 and el34. Kt88 pushpull ultralinear 45w stereo by lennshop duration. Electroharmonix kt88 vacuum tube high power kinklesstetrode for use in amplifiers such as the marshall major. I have run both kt88 s and 6550cs in cary and audio research gear. The new psvane kt88t treasure kt88z might be a good alternative. They are what rogue ships as standard issue in their amps. For the first time ever a kt88 tube utilizes a solid, thick and completely unique graphite plate anode. The results from testing the amplifiers are quite similar to the results from the oddwatt 225 6sl7 srpp kt77 classa pushpull tube amplifier. Due to the high current and power capability of these tubes, it is very important that the kt88 tubes are well matched. Kt88 here you will find a small collection of my all time favourite tube, thekt88. I have two other tube amps, a rogue chronos magnum and a decware mini torii that puts out 3. If no replacement is shown for a particular tube number, there is no replacement and you must use original tube number to replace a defective tube. Svetlana technical data kt88 high performance audio.
Aug 26, 2015 kt88 single end vacuum tube amplifier. Push pull 6550 monoblocks diy project sarris custom tube. The el34 being a true pentode sounds a bit rough and fluffy, even clean. Wonderful, sweet throated british tubes from the legendary marconi. This amp was designed mostly to work with kt88, 6l6, or el34 tubes in either triode or ultralinear mode. 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.
Oddblocks classa pushpull kt88 tube amplifier 12sl7. Kt88 is a low distortion, high output power tube developed specifically for audio. Use of these parameters shall be entirely at the users own risk. Brand new, factory matched pair 2 genalex kt88 6550. This 1960 tube caddy below book also includes all tube numbers from all over the world. Its construction features include black plates, black metal base, and gold pins. Kt88tii is clearly the better tube posted on december 25, 2015 by admin. Buy matched pair shuguang kt8898 vacuum tube replace kt88 kt88z 6550 kt88t. Genalex pair factory platinum matched gold lion kt88 kt88. Modelled by carefully measuring an original gec tube where all the vacuum had leaked out.
At times the response is a little sluggish because of its compression factor with a fast attack and slow release. Push pull 6550 monoblocks diy project sarris custom tube amps. These are an acceptable replacement for your amp, but we are unable to offer biasing. Sed kt88 high performance audio power tube sed tubes. It is intended for audio frequency amplification and close manufacturing specification tolerances and improved processing ensure reliability and superior sonic performance. Watch a video on how to spot a nos kt88 6550 vacuum tube. Based on our customer responses this kt88 tube definitely has the best bang for the buck of all the kt88 types. Looking for help to choose kt88 tube steve hoffman music.
Great 1953 sylvania below substitution tube manual for late 1930s to early 1950s. The el34 is probably the narrowest of the medium glass octals. Oddblocks classa pushpull kt88 tube amplifier 12sl7 driver. Buy electroharmonix kt88 vacuum tube, matched quad. Kt88 6550 equivalent genalex made in great britain matched pair. The kt88 is broader with less of a mid peak, the 6550 would be percieved as scooped. I dont like the gold plated bling on the psvane, but whatever. Radio receiving tubes and swap tips for the new 7 pin and 9 pin miniature tube types. I designed a driver pcb using two 6sn7s that can drive just most tubes, triode or pentode. Shuguang kt8898 kt88 6550 new platinum match quad ebay. This page lists several nice tube reference books, tube accessories, and pin cleaner, among other items. It has a sweet mid range that makes up for a tube that is generally intended for hifi. Tubes free delivery possible on eligible purchases.
Yaqin mc100b kt88 tube integrated amplifier 2 mode. Classa ultralinear 12sl7 srpp kt88 sipp tube amplifier. We have even run a quad of the kt88 s in a few evil twins and it is fat. Increased peak cathode emission from new cathode materials. If you want to add some real thunder to your old ampeg svt then the jj kt88 s are the tube. Vacuum tube kt88, electroharmonix antique electronic supply. Today, there are a number of quality kt88 tubes available for audio and guitar applications. Measurements pushpull kt88 tube amplifier 12sl7 driver measurements were made using a hp 331a distortion analyzer, tenma low distortion signal generator 0. The output tubes tried were 6l6gc, 6p3s, 6p3se, el34, 6550 and kt88. The eat kt88 has a designed maximum anode dissipation rating of 35w and is recommended for use in the output stage of an a. Seem to have lost my copy of the original so delighted to have found a replacement. Full text of tube substitution handbook internet archive.
The idea of building a diy audio vacuum tube amplifier based on highquality materials begins in the early 90s. Specifically designed for audio amplification, the kt88 has similar ratings to the american 6550 which was designed for use as a servo. These specifications are provided asis, with no warranty of any kind. Tubedepot carries a selection of 6550 kt88 kt90 power vacuum tubes. This improves tube life and reliability on top of providing outstanding audio amplification characteristics. According to the manufacturer the gold lion kt88 is an attempt to recreate the original genalex, which was introduced in 1957. I must stress that there are a lot of good versions of this exceptional tube out there and that these are just a few that i feel i have had enough experience with to share my views on. The kt88 was designed as an audio tube and a 6550 was designed as a servo amplifier tube. This kt88 tube is available in factorymatched quartets. This deluxe revised edition contains 40% new material, with. The kt88 is one of the few classic audio output valves.
They are supposedly high quality shuguang made tubes, so likely the good old mullard copy sound but without the fireworks. Specifically designed for audio amplification, the kt88 has similar ratings to the american 6550 which was designed for use as a servo amplifier. Vacuum tube kt88, electroharmonix antique electronic. I have some wear on the eh tubes so i am going to order another set of one type or another. Buy genalex gold lion kt88 power vacuum tube, platinum matched quad. Kt88 distortion and frequency at 35w with 16db of feedback vin1. Shuguang treasure kt88z vacuum tubes matched pair vacuum. The kt88 is more powerful than a 6550 and i think it is not as sterile sounding as a 6550. The other important thing to remember is that a properly biased kt88 will need signicantly more bias current than an el34, due to the higher 42 watts dissipation rating. I use electro harmonic kt88 s in my rogue m150 monoblocks. The pcb also includes a tube based power supply, using 5u4 or whatever tube you like, and snapmount capacitors on the pcb. Dec 25, 2015 kt88tii is clearly the better tube posted on december 25, 2015 by admin. Initially had to answer the question classic push pull or a single ended amp.
It is one of the largest tubes in its class and can handle significantly higher plate voltages than similar tubes, up to 800 volts. Sams, 1960s to 1970s, original publications, not reprints. Petersburg, russia, and is designed to be a direct replacement for any kt88, kt90, kt99 or 6550. This manual tells what radio receiving tube will substitute for another and work as a replacement. Matched pair shuguang kt8898 vacuum tube replace kt88 kt88z. Vacuum tube kt88, jj electronics antique electronic supply.
This series of handbooks were the bible of electronics repair technicians in the 1960s and 1970s, and are highly sought after today for tube rolling and tube equipment repair. Tube kt 88 or rohre kt88 id19153, beam power tube, octal int. This is a reprint of a famous mullard book now out of print and always very well. Please see the substitutes at the top of the page for more details. The kt88 is a beam tetrodekinkless tetrode hence kt vacuum tube for audio amplification.
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