Thus the driver amp must be able to make the vac without its thd exceeding. We should want to test the kt88 to see how it performs with signals. Personally i wouldnt use kt88 s in an st70 with an original power transformer. The purpose of this kt88 kt66 6550 kt90 kt120 page is to give an overview about what kt66, kt88. The plain strings are made from the same high carbon steel as the hex cores. Our new ehx strings electroharmonix electric guitar strings are customdesigned to our specifications and made in the usa by a premiere string manufacturer. Anyway, we tested my mkiiis for gain and distortion before and after the mod on shannons test bench. Showing the pete millet 8903b software in use as well as other tests. The kt88 fits a standard eightpin octal socket and has similar pinout and applications as the 6l6 and el34. The srpp driver and sipp output work very well together.
Yes, you could use a free software based signal generator to get going, there are. Iam have spent 9 months with the sev 6550c, 1 month with the kt 90 and 1 month with the sev kt88 on my jadis defy 7 amp. Kt88 s can take higher plate voltage and dissipate more wattage, so they are more powerful in the right circuit. A volt meter across the test points should read in the 40200 mv range.
Georgia i cant find in any of my tube data the settings for testing a 6550kt88 on my tv7 bu tester. Im rebuilding a set of bose 901s, series v speakers. Hence its recommended that the kt be biased as had it been 25w although it would stand up to 32w, the kt66s is 30w max. These specifications are provided asis, with no warranty of any kind. Writing your own soft for a really cheap eeg hardware engineuring. I tested 15 year old kt88 and new kt88 to use them for my new single ended. 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. If you have issues with your hardware, or if your cooling isnt up to snuff, youll find out in short order. These tubes are also ideal for amps that are looking to maximize their clean headroom, such as bass amps and guitar amps suited for metal players. Jj kt88 matched pair the jj electronics kt88 has beautiful imaging and nice full bass response.
The kt88 is a beam tetrode k inkless t etrode hence kt vacuum tube for audio amplification. Kinkless tetrode 90, is a beam power tetrode and features the same octal socket as its smaller variant, the kt88. Apr 19, 2017 no one can tell you what differences you may perceive. The kt90 is a vacuum tube used in audio applications. This electrical spec enables to design powerful amplifiers without parallel connection. In some equipment they interchange, some maybe not. Bg bench testing a chinese made cayin a100t kt88 amplifier. I am curious what you think of those ne kt88 tubes vs. Can be used in place of 6550 for a more round bass signature. Computer forensics and loopback test plugs for burn in testing. Looks like the jj kt88 is one of the only real current 88 tubes. This dropdown allows you to select a program maturity level. Each wound string is precision wrapped with round nickelplated steel onto a high carbon, hexagonshaped steel core. What are your favorite new production kt88 and 6550 power.
A pair of these tubes in pushpull configuration can deliver power levels of 150 or more watts. Jj kt88 matched quad the jj electronics kt88 has beautiful imaging and nice full bass response. Classa pushpull tube power amplifier electronics diy. Object of the test to evaluate the sound quality and reliability of the new batch of 6550kt88 and compare against the best new old stock types for use both audio and guitar and bass applications. The shuguang kt88 98 tube is of the same construction as what we have sold as the gold aero and penta type tubes. Free and cheap software for benchmarking like a pro pcworld. The kt88 is broader with less of a mid peak, the 6550 would be percieved as scooped. Dec 29, 2007 the stock st70s power transformer was really marginal with that amp and many old st70 power transformers have hum, buzz and vibration issues. 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.
One or the other tube not predictable which one will start to conduct more than its fair share of the current. 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. This new driver stage can be used without changes in the pp2010 to get 50w. This is a rare matched quad of type ii ei kt90 tubes. With its wide range of benchmark tests, 3dmark has everything you need to test your pcs.
No one can tell you what differences you may perceive. Kt88 is a low distortion, high output power tube developed specifically for audio. Home of the worlds best benchmarks and most popular performance tests including. My question to the experienced is what is a good method for bench testing each of the 18 speakers. On the plus side it has 16 channels allowing for almost full 1020 eegqeeg recording, multichannel neurofeedback training, or brain machine interface research. Kt90 bench test, richwalters, tubes valves, 4, 23rd.
It probably needs to be biased somewhat differently and may have a higher heater current than the kt88. When used at the parameters found in existing 6550kt88kt90. From what i hear, these tubes are interchangable on most amps it seems that the 6550 is the least loved tube of the bunch. The kt88 is a larger version of the kt66 that features higher power and very low distortion. Electroharmonix kt90 the electro harmonix kt90 eh tube is a dropin for any kt88 or 6550 tube. If your new st70 has an updated power transformer from triode or dynakitparts then kt88 s are an option.
Discussion in audio hardware started by libertycaps, feb 16, 2012. If your new st70 has an updated power transformer from triode or dynakitparts then kt88s are an option. View online or download ensoniq kt88 musicians manual, quick start manual. And this soft is very old probably written in late 90s, limited and may be.
Electroharmonix kt88 vacuum tube high power kinklesstetrode for use in amplifiers such as the marshall major. The 6550 could be likened to a hard vacuum 6l6 whereas the kt88 is a darker and stronger kt66, which is peakier and more compex sounding. I have no vested interest in psvane, shugang or grant fidelity nor were any of these tubes given to me. I had that same question today looking for the 6550s in the tv7u test data booklet. We dont know when or if this item will be back in stock.
Anode dissipation rate is 50w, which provides for pushpull amplifiers utilization up to 110w output per pair, with 550v on the anode. Kt77 vs kt88 talkin tubes the klipsch audio community. Up to 160w per pair may be achieved with anode voltage of 750v and screen grid. Iam have spent 9 months with the sev 6550c, 1 month with the kt 90 and 1 month with the sev kt88 on. What are your favorite new production kt88 and 6550 power tubes. Electroharmonix kt90 the electro harmonix kt90eh tube is a dropin for any kt88 or 6550 tube. I had a marshall major with 6550s and it was only putting out about 6080% of its power rating because it was designed for kt88 s. Shuguang kt8898 kt88 6550 new platinum match quad ebay. Specifically designed for audio amplification, the kt88 has similar ratings to the american 6550 which was designed for use as a servo. Kt88 and kt120 power tube compatibility test, electrical. Ive recently done some thd factor tests on the ei kt90 and jj kt88 in full power amp conditions and tabulated them graphically.
The 7581 has a plate voltage rating of 500 v35 watts 5 watts more than the 6l6gc and a screen rating. Bench test cayin a100t 8 x kt88 tube amplifier youtube. Kt88 s generate a lot power, handling significantly more plate voltage than other power tubes. Kt88s can take higher plate voltage and dissipate more wattage, so they are more powerful in the right circuit. Kt88s generate a lot power, handling significantly more plate voltage than other power tubes.
Pp2012 kt88 hiend push pull amplifier audio design guide. Due to the high current and power capability of these tubes, it is very important that the kt88 tubes are well matched. Personally i wouldnt use kt88s in an st70 with an original power transformer. Vr tests and a freeroaming experience mode to enjoy in vr or on your system. In addition, i changed my input signal tubes to siemens 801s and my driver tubes to ge 5 star black plate triple mica 6201. As a result, kt88 s and 6550s are produce cleaner tones and have low distortion, making it popular amongst bass amplifiers and high end audio applications. As input tube i suggest to use the old 12ax7 jan philips or the sovtek 12ax7lps the to. Those tubes are generally run at different operating parameters so, other than assuming that some differences may be noted, its not possible to have a clue about what those differences may be without knowing platescreen voltages, bias, primary impedance of the opt. The kt 88 is considered as being the tubes with a very high power while. The jj kt88 has been around now for a good 7 years and has an excellent reliability record. Kt881016 is a 16 channel eeg device produced by contec medical systems in china and is currently one of the most affordable per channel eeg machine. It may therefore be used as a substitute, given appropriate rebiasing when used in pushpull configuration. Downloadable content for this softwarebrowse all 12. Use of these parameters shall be entirely at the users own risk.
I just had a chance to change out the kt88 tubes and replace them with the sovtek 6550we tubes and i definitly like the 6550 tubes over the kt88 tubes,the 6550 tubes sound more aggressive and they have this midrange highend thing that i really like over the kt88 tubes,the plate voltage that i measured on my ampvht deliverance d60h was 475 and i biased the tubes to a nice and toasty 58ma and. Group b consists of kt88, kt90, 6550 and their variants. The stock st70s power transformer was really marginal with that amp and many old st70 power transformers have hum, buzz and vibration issues. Thermion has a quad that has over 2000 hours and they test on his hickok as new. Type ii is the best sounding and most desirable version of this tube, and can be identified by the numberous spotwelds on the plate structure. Testing kt88 for customer satisfaction showing 6 of 36 messages.
View online or download ensoniq kt 88 musicians manual, quick start manual. Recently, i lost my right channel from a kt88 tube gone bad and i decided this would be the perfect opportunity to have. 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. If a television arrived on their bench they could test all 27 vacuum. Vacuum tube kt88, electroharmonix antique electronic. Sonically they are true to the electo harmonix brand. The rubytad str is the same tube as the 6550 china tubes. At that time, i praised everything about the amp save for its excessive sweetness. Kt90 page 1 of 5 the kt90 is a beampower pentode primarily designed for use in audio frequency power amplifier applications. Sign in to add this item to your wishlist, follow it, or mark it as not interested. I replaced 4 year old gold lion kt 88s with shunguang 50 years of treasures in my rogue m150 monoblocks and i love the sound. The cpu test has been redesigned to let processors with 8 or more cores perform to their full potential. Discussion in the workbench started by jd267, sep 20, 2014. Vacuum tube kt88, electroharmonix antique electronic supply.
After many years designing single ended amplifiers i have decided to start a series of test about the push pull amplifiers. Choose port for monitoring, run kt881016 software and read eeg for a while. Kt88 uses a cp2102 chip made by silicon labs to to communicate with pc. I had a marshall major with 6550s and it was only putting out about 6080% of its power rating because it was designed for kt88s. Asevtlana 6550c, sev kt88 and the kt 90 type 3 from kevin deal. Discussion in the workbench started by pittbull, jul 14. This chip essentially allows micro controller on kt88 to talk to pc as if it was connected using serial port but does it over usb interface. Tv7 bu settings for 6550 kt88 antique radio forums. Based on our customer responses this kt88 tube definitely has the best bang for the buck of all the kt88 types.
Kt88 is one of the great power tube for high power amplifiers. Benchmarking can be an entertaining way to keep abreast of whats. Those tubes are generally run at different operating parameters so, other than assuming that some differences may be noted, its not possible to have a clue about what those differences may be without knowing platescreen voltages, bias, primary impedance of the opt, characteristics of the. It seems these chinese tubes are so much alike aside from smoked glass or grey glass, etc. The el34 is probably the narrowest of the medium glass octals. If a television arrived on their bench they could test all 27 vacuum tubes to see if they were serviceable within an hour. The kt88 can be used interchangeably with its american rival, the 6550. It produces a nice warm bass response with plenty of depth and detail. Buy gemtune gs02 kt88 vacummtube amplifier with kt882, 6n8p2, 5z3p1. I just had a chance to change out the kt88 tubes and replace them with the sovtek 6550we tubes and i definitly like the 6550 tubes over the kt88 tubes,the 6550 tubes sound more aggressive and they have this midrange highend thing that i really like. Kt90 bench test 2 attachments ive recently done some thd factor tests on the ei kt90 and jj kt88 in full power amp conditions and tabulated them graphically.