Can i solicit some opinions from anyone who has tried any octal preamp tubes. There is little of real interest here in terms of a complete system, as the system discussed. I have to admit it frosts me as to why, and id really like to know why there are so many interchangeable tubes with minuscule differences in characteristics. Th e composite tube s ubstitu tion g uid eboo k co ntain s 5 100 receiving tube s ub sti tu tions. The 6sn7gtb is a mediummu twin triode suitable for use in a wide variety of generalpurpose. Milhdbk2a electron tubes cross index and type identification 1963 the purpose of this publication is to provide as complete a list as possible of electron tube types used in armed services equipments or stocked in depots, together with a cross reference to any other type numbers or designations these tubes may have. For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1. The output stage uses two 2a3 tube configured as push pull. The input stage uses pentode 6sj7 for preamplifying and the following stage uses twintriode 6sn7 for phase splitter. The 6sj7 is a high gain screened pentode and dates from the mid 1940s. Many of these have a metal envelope, but glass bottle ones are available.
The 6sj7 is a metal sharpcutoff pentode designed for use as a biased detector or highgain. This manual, like its preceding editions, has been prepared to assist those who work or experiment with homeentertainmenttype electron tubes and cir cuits. According to my tube caddy substitution book dated 1967 you can use in place of a 6sk7 6ab7,6ac7,6sg7,6sh7 or 6sj7 with no problem. Thats how i wound up with some uncommon tube choices. Excellent resource tube substitution list article from 1945. I highly suggest you take a look at bills ham radio www server and type in the tube number, and see what substitutes in can give you. The tube used as the example is the 6sj7, but any sharpcutoff pentode will do, such as the miniature 6au6. View and download analog metric 2a3 user manual online. Rca also made a long life version of the 6sj7 as part of their red series. Download the entire rca hb3 tube manual series detailed tube specs.
The 436 is a very primitive compressor design, and it sounds awesome but it was also built primarily for service is installed sound systems. This one has a lot of pages from the european philips tube manual. Transparency was not just a bit higher than many other 6sj7, but it was a huge step forward. Jj 6v6s datasheet pdf download adobe acrobat pdf reader. Description all tubes 6j8 is new, military equipment and have otk mark. Tube 6sj7 or rohre 6sj7 id2716, vacuum pentode, octal int. This ne w t ube s ub stitut io n guidebook tube substitution.
Power tube selection charts for highpower audioamplifiers eimac,rcapage 1, rca page 2. Co mb ines i n one volu me the con tent of th e bas ic book and suppleme nt s i thro ugh iv. View and download mapletree stealth max user manual online. Warranty information and return policy warranty period.
Date codes for rcamade tubes ludwell sibley there is a sort of fascination with the date codes that are found on tubes. Galls bottled 6sj7s always seem much noisier than the metals, at least in my experiences. Tube data lots of tube data via pdf copies from tube manuals courtesy of frank. The octal preamp tubes i am familar with were used in tweed fenders and many other vintage tube amps. Well, i cant really help you understand because although i love tubes, i am no expert on their functionning. Similar to types 1603, 77 and octal types 6j7 and 6sj7. It is a sharp cutoff type and is specified for rf or af use. Page 4 the input stage uses pentode 6sj7 for preamplifying and the following stage uses twintriode 6sn7 for phase splitter. 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. I found out that the preamp tube 6sn7 was replace by 6sl7 by a previous owner. Find great deals on ebay for 6sj7 tube and 6sj7gt tube.
A drop in, pointtopoint wired driver board using mullard driver topology with 26sj7 and 26sl7gt tubes. Hickok documentation, manuals, schematics, and catalogs. Ok, purists, you can claim that using a pentode in triode connection is actually a form of feedback. I am not sure if this should be ok but i rather change them back to normal 6sn7. Block diagram, pinout and 6sj7gt circuit application inside. Feel free to send us your hifi audio schematics and we will add them here. Like the 6sn7 gtb to which it is electrically equivalent, the tube may also be used as a, rated heater voltage to a circuit consisting of the tube heater in series with a resistance equal to 3.
This tube also will serve as a good alternative choice to the now hard to find ef86, if you can change over to an octal socket. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. If you have built any of these circuits, we would love to hear from you so send us your comments. This must be a slightly later version of the 40a, as the 2nd tube is a 6sj7, which is a variant of the 6j7 that has the input grid connection in the base rather than on the top. It is not coming from the pi and goes away when the volume knob is down.
The 6sj7 is a pentode preamp tube that was used in the first fender champ. In a previous post, we looked at the altec 436 varimu tube compressor. Quality russian 6j51p tube was made in ussr for the military equipment. There is a russian equivalent, i like its the 6j8, that hifi guys rely on when they need a bargain tube, its probably the same tube sovtek labels as 6sj7. The entire 1945 taylor tube catalog in pdf format note, 1.
All our tubes are guaranteed for 3 months from the date of purchase. The tube is manufactured by the nevz, novosibirsk, ukraine. I used 105 v from a vr tube at first, later the allinone supply described above, which proved very convenient. It makes things very easy if you have four dmms for the various measurements. Users manual download pdf special red octal driver module for dynaco stereo 70 power amplifiers. I built one of these a few years ago, and it never really got used all that much because the output level is so hot.
Builtin tube 5z3p5u4g and solidstate rectifier and regulation circuitry with two inductors option in clc. Gec, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Galls bottled 6sj7 s always seem much noisier than the metals, at least in my experiences. It was not as warm and musical compared to sylvania chs 6sj7. Twin triode, 6sl7gt datasheet, 6sl7gt circuit, 6sl7gt data sheet. The 6c6 is essentially a 6pin version of the 6j7, which is the top cap version of the 6sj7. Unfortunately i can only find one 6sj7 in my tube stash i have more coming in the mail so maybe it is a bad tube. Excellent info source for us, european, and other tubes. The classic information, on early rca tubes in particular, is.
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