2sj74 2sk170 matched book

For 2sj74 and 2sk170 devices, the idss range is broken down into 3groups. J56 are 2sk1702sj74, but almost any pair of jfets will do there. I find 2 x 2sk170 which both have an output of 2ma just a random number when im matching the 2sj74s, should i then those the two which are closest to 2ma, or just pick the 2sj74s which are closest to each other. Linear systems lsk170 ultra low noise single nchannel jfet 8 pieces sep 18th update. I tend to shy away from using hardtofind japanese transistors in my projects because they are intended to be built by many people, and specifying such parts can be a headache.

Because,ive got problem to get the 2sj74 and i want to matched them so i must take a lot in bl series. This ensures schematics lownoise and high slewrate. The 2sk170 is an nchannel jfet and the 2sj74 is a pchannel jfet with complementary specifications. Discrete complementary jfets are nchannel and pchannel jfets that are built with a similar. Please refer to project 46s schematic diagram from hereon. In the era of 70 until the end of 80, the audio amplifier manufacturers competed with each other offerring superior technical specifications in terms of the wide frequency response, total harmonic distortion and. Superior performance, domestic source the lsk170 is specifically designed for low noise, high input impedance applications within the audio, instrumentation, medical and sensors markets. Tme has over 800 employees, who provide expert support at each stage of the ordering process our offer includes 300,000 electronic components from 950 producers since 1990, we have been expanding our operations dynamically and increasing our global potential. Toshiba 2sk170 and 2sj74 in unitygain buffer circuits without feedback. The lsk170 series is a pin for pin replacement of the toshiba 2sk170 and improved functional replacement for the interfet if20, if30, if31, and if4500.

I am going to test the resistance between pin1 and pin3 and the correct value shouldnt be over 80 ohm fake one is always over 80 ohm. The exception here are the 2sk170 and 2sj74 input jfets as there are no suitable substitutes, so i have to stock them in amb audio shop as prematched quads. This amplifier is the le monstre version that can deliver 8 to 15w of pure class a amplification at uncompromised sound performance. Best sounding transistors audiogon discussion forum. First, it uses only directcoupled matched discrete complementary jfets the now unavailable toshiba 2sk170 and 2sj74 in unitygain buffer circuits without feedback. First watt b4 user manual by nelson pass the b4 is a stereo active crossover filter system designed for high performance and flexibility and is unique in several ways. Since the matched quads 2sk170 2sj74 are hard to obtain and expensive nowadays, ability to use symmetrical frontend with bjts is provided on the pcb. Toshiba field effect transistor silicon n channel mos type. Diritto di recesso hai il diritto di recedere dal contratto, senza indicarne le ragioni, entro 30 giorni.

We are now offering a new wider range of matched linear systems jfets as it is a more practical format for most diyers. Electronics data book most of the low power transistors have maximum gain. Where you will see some dependence for certain is on the input and output transistors. Aoweziic 100% new imported original 2sk170 bl 2sj74 bl. Toshiba field effect transistor silicon n channel junction. The 2sk170 is an nchannel jfet, the pchannel version is the 2sj74, a dual matched pair nchannel is the 2sk389, and dual pchannel 2sj109. These devices have a limited voltage rating, 25 volts for the p channel 2sj74 and 40 volts for the n channel 2sk170, and this creates a practical limitation for the rail voltages in this push. Jfet input stage is based on self biased symmetrical topology with 2sk170 2sj74 complementary pairs. The recommended jfets, toshibas original part numbers 2sk1702sj74, unfortunately have discontinued or obsolete lifecycle status. Click to buy information furnished by linear integrated systems and micross components is believed to be accurate and reliable. The analysis of the cfp stage made the assumption that the npn second device has a constant current gain.

These are used for excellent pair matching and low noise. Thermal coupling the 2sk1702sj74 matched pairs home. Toshiba 2sj74 v 2sk170 v matched jfets for mc line pre. Jfets are sufficiently fast that you can encounter problems with. Note obsolete part limited availability not for new designs. Im looking into setting up a webshop to sell pcbs and matched jfets. Bipolar junction transistors bjts have long been the preferred solid state device, partly because they were the first available, and largely because the technology advanced quickly, first germanium, then silicon, and ever more sophistication in terms of fabrication and performance. Visit cricklewood electronics for professional cctv systems that give full security to the homeowner. Amp diff main amp diff 2sk369 2sk170 2sj74 2sk389 2sj109 97. New ultra low noise jfets target audio, instrumentation.

Discrete complementary jfets come in separate p and nchannel packages. This product format 8 packs of unmatched jfets has been discontinued and replaced. Sale is for 8 pcs 8ea 2sk170, all super matched bl current range 910ma range. The complementary and matched nature of the dual nchannel and dual pchannel. I only need to match 2sk170 and the 2sj74 before my amp is done. Aoweziic 100% new imported original 2sk170bl 2sj74bl 2sk170bl 2sj74 2sk170 to92 audio matched transistor power triode. Similarly to other active devices like the bipolarjunction transistor bjt or the junction fieldeffect transistor jfet, in a sit the current flow between two terminals the source and the drain can be controlled through the third terminal the gate. Porsche 356 new old stock wheels rims matched set of 4 date 1064 kpz. The 2sj79 parts is silicon p channel mos fet, manufactured by hitachi are available for purchase at jotrin electronics website. J12 are 2sk389 monolithic dual jfets and j34 are the complementary 2sj109. For 2sj74 and 2sk170 devices, the idss range is broken down into 3 groups.

Mosfet curve tracers result, which must be the same with the original. Linear systems lsk170, lsj74 and toshiba 2sk170, 2sj74 types is plenty good. Nelson pass built such a design based on toshibas 2sk170 and 2sj74 single. Please let us know if you have a known distributor so we can add it to our database, or request a quote from one of our partners. The 2sk170 is an nchannel jfet, the pchannel version is the 2sj74, a dual matched. From memory the f5 needs matched pairs of 2sk1702sj74 preferably bl. They dont say how they are matched but even by themselves it seems like a pretty good price and hopefully being somewhat matched already gives better. Toshiba field effect transistor silicon p channel junction. This was why i bought the linear systems matched pairs from diyaudio as i really couldnt face the pain of trying to find 2sj74 that were genuine and matched the few 2sk170 bls that i have. While searching for schematics i ran into a lot of designs using these 2sk170 fets, all based on the same schematic though. Here is the file which you can enlarge to see the curve and estimated yfs gain of.

Toshiba low noise jfets 2% idss matched 2sk1702sj74. Unfortunately we do not know of any distributors for toshiba 2sk170 vtpe2,f. Toshiba 2sk389 with lsk389 the 2sk389 lsk389 is a monolithic matched dual jfet on a single chip why use onchip dual jfet instead of 2 single. For 2sj74 and 2sk170 devices, the idss range is broken down into 3. Please use these devices linear systems matched lsj74lsk170. The design is with reference to the legendary design by jean hiraga. Here you can find a wide variety of types and values of electronic parts from the worlds leading manufacturers. I have designed a mkii jfet matcher in the form of an arduino shield which enables me to do automated testing on large numbers of jfets. Every day, we send 5000 shipments and we ensure that they arrive in the shortest time available. While these two are not perfectly matched complementary devices, they are very close and can be used as such. Dual discrete complementary jfets house two nchannel jfets in one monolithic unit and two pchannel units in another monolithic unit. Buy matched 2sj200 2sk1529 j200 k1529 toshiba high power audio amplifier mosfet at amazon uk. The circuit uses a very specific jfet family from toshiba.

Does anyone knows if theres a equivalent of thoses transistors. While not a bad thing overall, the accuracy of the matched transistors is. Toshiba field effect transistor silicon n channel mos type 2sk1530 highpower amplifier application z high breakdown voltage. Ive lost count how many times this question keeps getting asked. Save 2sk170 matched to get email alerts and updates on your ebay feed. Knut on the other hand suggested that these jfets have available replacements at. Over the years i have obtained many, many transistor spec books and.