Im new to interpreting tube data, but it looks like the grid limit on the jj 6ca7 sheet is 500v. The tube was originally introduced by rca in an ad in the january, 1952 issue. The 6ca7 is a power pentode designed especially for high fidelity audio. Data for ultralinear output transformer screen tap. Even more powerful than kt77, and very similar to 6l6 sound. Electron tube data sheets electron tube data sheets, valve, tube, electron tube, vacuum tube, diode. We are adding back in kt88z, 6ca7z el34, 300bz, cv181z exact replacement of 6sn7 and the most recently 6sl7z exact replacement of 6n9p models of shuguang treasure black bottle tubes with our newly formed quality control collaboration with shuguang tube factory. Current production el34 tubes are true to the original. Petersburg, russia, and is designed to be a direct replacement for any el346ca7 or. Today, tube manufacturers returned to the roots of these great tubes. Well, seems we replica has been a theme for tube manufacturers from china. Substitutes are given as a guide only please refer to. Designed to the exacting specifications of the philips 6ca7 tube, this classic tetrode returns to life in a big bottle design. Jj electronic vacuum tubes, capacitors, amplifiers.
Reflektor 6l6g 6n3c 6p3s nesstone amplifier tube sales. Other excellent links for technical information can be found at el34 tubes in wikipedia, el34 tubes. The el34 was the 1952 successor to the very successful el37 and both share a high value of mutual conductance 11. But, between the three, the jj and eh 6ca7 and the kt77, the jj kt77 is the best of the three, being better in the highs, a cleaner midrange and just a. New jj electronics power tube, add some low end chunk to your el34 tone. And many european tube manufacturers soon started manufacturing el34.
In common with all e prefix tubes, using the mullardphilips tube designation, the el34 has a heater voltage of 6. Some folks might find the larger bottle more aesthetically pleasing, or if the tubes are in a tight area the shorter bottle may be more appropriate. This is why you see some nos tubes marked as el34 6ca7. Its not an easy task to build a tube that has never been built, but jj has proven they are the people to do it. They may not generally break up as early as the eh, which may be why they dont sound as bright. Electroharmonix electroharmonix is a new york based company known. Close manufacturing specification tolerances and improved processing provide enhanced reliability. If you choose include equivalent types and an equivalent datasheet is present, the search will show the equivalent data sheet. Petersburg, russia, and is designed to be a direct replacement for any el34 6ca7 or equivalent. This amplifier was featured on the january 2003 issue of the highfidelity audio. But this one is not an exact replica of western electric 421a equivalent to 6sn7.
Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. According to the data sheets found in old vacuum tube reference manuals. The svetlana el34 gives electrical and audio performance very similar to that of the original mullard el34. It all seems very complicated but isnt really once you have successfully done it once. Gold plated control grid for improved fidelity and a plate dissipation of up to 9 watts. Another britishmade tube, the kt77, is also a dropin replacement for the el346ca7. Output pentode 6ca7 is a beam power pentode with octal base.
The svetlana el34 is manufactured with the original mullard design in the svetlana factory in st. You can also find equivalents for service types cv vt etc. The sed el34 6ca7 tube is a power pentode intended for ultra linear audio frequency power amplification service in. The electroharmonix kt88 has excellent tonality, with a full bodied sound, and great dynamics. According to the data sheets found in old vacuum tube reference manuals, a pair of el34s with 800 v plate voltage can produce 90 watts output in class ab1 in pushpull configuration. The el34 is a much loved audio power valve with an anode dissipation of 25 watts. The reflektor 6l6g 6n3c 6p3s are russian made 6l6 type tubes from the 50s.
The el34 and 6ca7 are identical, and most versions have both type numbers on the label. Tube 6h6 or rohre 6h6 id596, double diode, octal int. Discussion in amps and cabs started by papersoul, apr 29, 2017. The electro harmonix 6ca7 is built to withstand todays highgain amps while still retaining the detailed tone and component integrity of the original. The el37 was of pinch construction whereas for the el34 mullard used the pressed glass foot construction employed on the b9a and b7g miniature valves for this io based device. Electron tube data sheets electron tube data sheets. I also prefer the jj 6ca7 over the eh in the midrange as i feel it is slightly more realistic, more 3d sounding over the eh tube. Pdf b6122, b6148 b712, b7111 b7119 6l6gc 6l6gc tube pentode pl tube 6l6gc 6l6gc data 6l6.
Data sheets are available for different brands of tubes. The technical data is contained in the highresolution color scans of over 20 original catalogs from 1958 to 1963. While these tubes have the same pinout and minimum tolerances required of a kt66 tube, they do not have the performance characteristics of a true kinkless tetrode kt66 tube. But, between the three, the jj and eh 6ca7 and the kt77, the jj kt77 is the best of the three, being better in the highs, a cleaner midrange and just a better overall performer and the better value. I have a tube data sheet for 6ca7el34 that has 25 watts for the plates plus 8 watts for the screens listed. 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. Vacuum tube 6ca7, electroharmonix antique electronic supply. Links to tube data are mostly to the wonderful nj7p tube data site. The american retma tube designation number for this tube is 6ca7. Electroharmonix 6ca7 this tube is very similar sonically to the electro harmonix el34, but in a shorter fat bottle design, so we call it a 6ca7. Electroharmonix 6ca7 vacuum tube big bottle beamtetrode version of el34. El34s is an economical method to achieve high quality sound with a minimum of driving stage components.
Some modern russian manufacture sovtek kt66 tubes are actually 6l6gc tubes in a kt66 style bottle. The wide glass tube envelope is 34 mm in diameter and excluding io base pins the valve is 95 mm high. Select one of these flags to go to the electron tube data sheets the flags correspond with the location of the mirror site. The tube construction consists of triple getters, additional support posts, and cooling fins along the anode. This is an exact copy of the kt88 valves that were manufactured by marconiosram for marshall in the late 1960s and 1970s. El34 6ca7 kt77 tubes are in stock and ready to ship. Another britishmade tube, the kt77, is also a dropin replacement for the el34 6ca7. Quite similar to 6l6 tone but with a little more rolled off high end. Even those made in the late 1970s in great britain are wonderful tubes, easily outperforming the current made tubes of this type.
Single tube pushpull plate voltage, maximum grid no. The tubes are well matched and have very nice original boxes with the tube data sheet included. But the issue is tube venders are saying it is a direct substitute for an el34 in all situations. The sed el34 6ca7 tube is a power pentode intended for ultra linear audio frequency power amplification service in either pentode or triode. The tube was originally introduced by rca in an ad in the january, 1952 issue of qst magazine. This is a hand aligned beam power tube resulting in stable performance at higher power levels. Output pentodeoutput pentode rated for 25w anode dissipation,ntended for use in a. El34 6ca7 power pentode click on links below to check stock philips holland metal base 19551958 philips holland brown base double d getter halo 19581962 ge big bottle 1970s japan 1960s 1970s mullard xf1 fat base and welded plates 1958 1962 mullard xf2 welded plates 1962 1973 mullard xf3 stapled plates 1973. Tube 6ca7 or rohre 6ca7 id4708, beam power tube, octal int. A pdf at the end of a tube description is a link to a pdf of the tubes full data sheet, which generally contains characteristic curves for the device. We are adding back in kt88z, 6ca7 z el34, 300bz, cv181z exact replacement of 6sn7 and the most recently 6sl7z exact replacement of 6n9p models of shuguang treasure black bottle tubes with our newly formed quality control collaboration with shuguang tube factory.
Kt77 all but disappeared when gec stopped production in the 80s. The 11v tube may run a little hot, but unless you have an enclosed cabinet full of them i dont think itll be an issue. Apr 29, 2017 i think some older marshalls fall into that category partly why the svetlana c el34 with the 500v grid limit is more reliable than many cp el34 including jj that have a 450v grid limit. European el34s such as mullards were often sold as 6ca7s in the us too.
The electro harmonix 6ca7 is not and i repeat not a power pentode like the original 6ca7s were, in fact they are beam tetrode as stated on the electro harmonix website. Please see the substitutes at the top of the page for more details. Electroharmonix electroharmonix is a new york based company known for pedals and rebranded vacuum tubes. El34 6ca7 power pentode click on links below to check stock philips holland metal base 19551958 philips holland brown base double d getter halo 19581962 ge big bottle 1970s japan 1960s 1970s mullard xf1 fat base and welded plates 1958 1962 mullard xf2 welded plates 1962 1973 mullard xf3 stapled plates 1973 1975 mullard xf4 stapled plates late 1975 1980 rft east germany 1970. Tubedepot carries a selection of 6550 kt88 kt90 power vacuum tubes. The el34 is a thermionic valve or vacuum tube of the power pentode type. This tube is suitable for all applications which require peak powers of up to 11 watts from a single tube or up to 100 watts, 6ca7 one tube in triode connection ef 63 volts supply voltage 375 volts.
Heres a quick link that shows the generic parameters for various types of tubes. A little more energy than the sed winged c, so if you need a little more clarity and pop on top end. A favorite among hifi audiophiles, provides excellent value for the price. When installed in a 50w hiwatt head these tubes just roar. It is for a different amp but the idea is the same. Vacuum tube 6ca7, jj electronics antique electronic supply. Gec, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. They can be used in place of 5881 and are perfect for vintage equipment. In 2009 we asked our good friends at jj electronic to build us a low power el84 and they agreed to do it. What about the original sylvaniage big bottle 6ca7s. The 6146 beam power tube and its various descendents 6146a, 6146b was and still is one of the most popular transmitting tubes in amateur radio service.