Yes, they were lighter and cheaper per watt than the thermionic hulks we loved so much, but they broke all the time thanks to the germanium transistor and sounded likewell, let j. Has new, new old stock, and obsolete transistors in stock, including hard to find germanium transistors used in restorations, projects, and effects pedals. Although minor variations occur, the ge sound is the same timbre type of tone as any other ge transistors. Ac125 datasheet, equivalent, cross reference search. I have divided the transistor designs into two eras. The 2n1532 is also a germanium pnp power transistor, similar to a number of other power transistors of the time. Selected ac125 pnp germanium transistor, hfe8090 leakage smaller than 300ua. The ac128 is a great sounding germanium transistor but if you buy many of them, there will be a large number left. Ac128 datasheet14 pages etc1 germanium small signal. Return with us now to the halcyon days of germanium germanium transistor projects intrigued experimenters from the early days in the 1950s until the early 1970s. These were made by etching depressions into an ntype germanium base from both sides with jets of indiumiii sulfate until it was a few tenthousandths of an inch thick. Ukbo samples breakdown voltage collectorbase for a given reverse current collector and emitter open. Low power af amplifier transistors like the oc71 can. Text in other languages may differ dimensions whd incl.
Ac128 datasheetpdf 1 page list of unclassifed manufacturers. Ac125 germanium pnp transistors matched set for a tonebender. A discrete 3w audio power amplifier circuit is shown in figure 1 employs a complementary output stage featuring the ac 187ac188 t 3 and t 4 germanium output transistor pairs. They are a direct substitute for oc81d and work great in fuzz pedals. Etc1 germanium small signal transistors,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Build germanium transistor projects with silicon transistors. Ac122 datasheet germanium small signal transistors. If ever there was a western electric collectors item, this is it. Max2680 o high input thirdorder intercept point o ac125 pnp germanium transistor, new old stock, made by tungsram. The sound of germanium has a warmth and a granulity as pleasant to the ear as the tube sound, without being the same.
It is not hifi and i would not recommend it for design into a new commercial product. You could also experiment and get a sound you like that goes beyond the standard. Ssd1805tr1 2 x 68 stn lcd segment common monochrome driver with controller. Fully tested with a peak atlas dc55 and sorted for gain, compensating for leakage. Those of us who cut our engineering teeth on tubes still remember the advent of the solidstate amplifier with mixed feelings. Indium electroplated into the depressions formed the collector. Cases gec mazda stc aei hivac newmarket texas transistors. The column marked case is the outline of the transistor case. The sensation of warmth is about equivalent for analog reasons, in particular the miller effect that dynamically attenuates the. Aug 08, 2011 the very old ac128 germanium transistor had a different baseemitter voltage requirement compared to a silicon transistor and had a poor high frequency response so it will sound different to a silicon transistor. Pnp germanium alloy transistor for af preamplifier applications. Ac125 pdf, ac125 description, ac125 datasheets, ac125 view. Home electronic parts semiconductors transistors germanium transistors ac128.
In this way the transistor regulates its own base bias by adjusting the collector voltage to suit, and was, if not still is, a common technique. The bias for this same transistor is then taken from that same point 100 f cap, which of course equates to the nosignal collector voltage of the transistor. This page looks at the germanium transistor era and covers the 400 and 500 ranges which used germanium transistors in the output stages of their power amplifier sections. Being a much less complex case design it must have been considerably less costly than the to36 package in figure 1, and has become one of the most. You have clicked a page that seems to be very popular. Germanium transistor assortment 20 pcs npn pnp hfe fuzz gain incl 20 transistor socket. This amplifier can deliver a maximum of 3w into an 8. Redesign germanium transistor circuits, part 1 today. It seems stock of these is rapidly dwindling worldwide. These are pretested, so you dont need to buy the testing fee. Transistors made of germanium a semimetallic element produce a warm, rich, and extremely dynamic sound. Offering a matched set of three ac125 germanium pnp transistors for tone bender mkiimarshall supa fuzz. Reviews and recollections the germanium transistor era.
Ac128 datasheet, equivalent, cross reference search. Reviews and recollections the germanium transistor era i have divided the transistor designs into two eras. Application notes common usescase packagedatasheet. The complementary mosfets may be used to form a level shifted high side switch, and for a host of other applications. The to1 standard was the first allmetal case used for germanium transistors when the black glass models were abandoned around 1964. This may be the original mass produced transistor from bell labs manufacturer, western electric. Nos new old stockplease note, some of these are very early and heavy, these have a thick 3mm thick flange with indent and e, b stamp. Germanium transistors the following table lists the parameters for germanium transistors. Audio medium power types oc72 oc81d oc81 can be replaced with an ac128, a relatively high voltage, high current device. Ac128 germanium transistor pnp hfe 100 build your own. Germanium small signal transistors, ac125 datasheet, ac125 circuit, ac125 data sheet. The sensation of warmth is about equivalent for analog reasons, in particular the miller effect that dynamically attenuates the high frequencies.
This concerns european series like acs, industrial series acys, asys, aszs, the british nkts and the japanese 2sas. Most germanium transistor production ceased in the 1970s in favor of silicon which are more stable, consistent, have higher gain, and lower leakage. The first highfrequency transistor was the surfacebarrier germanium transistor developed by philco in 1953, capable of operating up to 60 mhz. Circuit diagram of 3w audio amplifier using ac187ac188 pair. Transistors germanium gt109g analogue 2n207, 2n266, 2n404. Chiana56 2n3303 t1s57 rjh 3347 germanium transistor transistor bf 175 bf173 2n3574 2n3792 transistor itt 2907 2n3830. Npn germanium transistor set for diy effects pedals fuzz. Ac128 germanium transistors transistorsics lowleakage pnp germaniums perfect for all your fuzzy desires. Their british manufacturer newmarket was a specialist in low cost components, and this cheap copy of the ac125 has been by chance at the origin of a cult pedal. In the seventies, the superior silicon devices began to take over the hobby market.
Ac125 germanium small signal transistors components datasheet pdf data sheet free from datasheet data sheet search for integrated. Oc25 germanium pnp transistor in a to3 case by mullard. This project originated as an experiment in how to use the germanium transistors that are left over when sorted for leakage and gain. Ac125 transistors 90 in stock to buy, photo, pdf datasheet.
Home electronic parts semiconductors transistors germanium transistors. Ukbo samples breakdown voltage collectorbase for a given reverse. The case drawings are shown at the bottom of the page. Philips new old stock ac125 transistors to1 all products available from stock. Printable version ac128 ac 128 getransistor pnp 32v 1a 1w to1. Any germanium pnp will technically work, though there are suggested gain hfe values for both.
Etc1, alldatasheet, datasheet, datasheet search site for electronic components. We also have new old stock ecg and rca sk transistors in stock and ready for delivery. In this way the transistor regulates its own base bias by adjusting the collector voltage to suit, and was, if. Pnp germanium alloy transistor for af low power amplifier applications. Taa920 germanium diode oa 182 bsv57b ac187k fy sot 143 bf194 ad 161 bpx34 bpw14 text. Early power transistor evolution, part 1, germanium. Transistors germanium mp20b analogue 2n109, 2n59, 2n60, ac125. Ac127 datasheet, equivalent, cross reference search. Jun 24, 2015 10 w audio amplifier with germanium transistors. You could buy a fuzz face combo or maybe there are fuzz factory combo packs available. Jun 16, 2015 the to1 standard was the first allmetal case used for germanium transistors when the black glass models were abandoned around 1964. As you can see from the sealed military packing, it was produced in 1954 at kearny, nj. Germanium transistors have been out of production and valuable to pedal builders for a long long time.
Im working on a guitar pedal that calls for a ac128 germanium pnp transistor and i was wondering why i might not want to just get a modern equivalent. Information source collector info sammler ktt 196970, tvt 1979 eca. Mp20b germanium alloy transistors pnp switching lowfrequency lowpower. Liven up your fuzz face, pimp your fuzz factory, wrangle your rangemaster. Transistors germanium gt109g analogue 2n207, 2n266, 2n404, ac125 ussr 6 pcs. Gordon holt tell us what they sounded like in an as we see it.
It is especially suitable for guitar amplification, and can apply to harp and some keyboards. Germanium has slightly different characteristics from silicon. Ac125 datasheet, ac125 datasheets, ac125 pdf, ac125 circuit. Any orders placed through this store will not be honored or fulfilled.
Ac125 datasheetpdf list of unclassifed manufacturers. The rumours ive heard is that some resellers purchase a big bulk collection, sort all the best transistors out maybe 1 in 10 if that, then sell the leftover dreck to the next sucker. The circuit has far more influence on the tone than the transistor type with some exceptions that are a bit complicated to delve into further here. The transistors are from a sealed bag from the 1970s and are gain matched and checked for proper leakage with a peak atlas dc55 transistor tester, and checked in circuit in one of my test pedals. Ac125 datasheet germanium small signal transistors. Jun 24, 2015 jun 24, 2015 10 w audio amplifier with germanium transistors. Buy online discounted oc series transistors from silicon. Alibaba manufacturer directory suppliers, manufacturers. Ao4609 complementary enhancement mode field effect transistor the ao4609 uses advanced trench technology mosfets to provide excellent rdson and low gate charge. These come already mounted in a big aluminium or plated steel block 7 x 7 x 15mm which can be bolted down using an m2. Ac187k germanium transistor buy, price, datasheet siliconark.