Buy online discounted oc series transistors from siliconark. Bipolar power transistor selection guide january 2003 table of contents product page general purpose transistors horizontal deflection output transistors product page dpak d2pak sot223 ipak to126 todarlington transistors dpak ipak to126 to220 to220f to3p to3pf switching transistors dpak d2pak to92 to126 to220 to220f to3p to3pf 2. A great book for learning electronics in easy plain language. Also as with any transistor set look for damage caused by leaking batteries. Heat sinks and fans increase the ability of a transistor to dissipate heat. Some pages missing but still a useful source of info. A to5 transistor with a p d of 3 watts might be able to dissipate 810 watts with a heat sink. Low power af amplifier transistors like the oc71 can be replaced with. The problem is not as universal as with the af117 series however, and replacement with a similar transistor from a scrap set will often be a permanent solution. Should you find any info that can fill in any of the blanks in the matrix below. Germaniumtransistoren by transistorvergleichsliste and a great selection of related books, art and collectibles available now at. Oc71 datasheet, equivalent, cross reference search. It is necessary to ensure that the replacement transistor will be able to operate at the relevant frequencies, so a similar or slightly higher ft is advisable. The best equivalent transistors are the af12x series that are the same piece of.
Select a replacement transistor with equivalent ft. Buy principles of transistor circuits, ninth edition. Semiconductortransistor crossreference list peavey. Sample pages of the vrt comparison books from eca edition 20102011 vrt volume 1 from a to z split into 2 books vrt1a and vrt1b 1496 pages isbn 9783937469379 vrt volume 2 from 0 to 680 pages isbn 9783937469386.
Others, shortform transistor datasheet guide, scan, pdf. Many times the equivalents shown in the various books are harder to find than the original component. Is there anything available to see if a particular transistor can be replaced with a different one. The links at left may help you to research your own replacement transistors. This looks like the ubiquitous to18 package as used by the bc108 and similar but with a forth lead for the screen. Or if you know the transistor you need then simply type the first 4 or digits in the above search box. There are books galore on this but surely someone knows of a site that has them listed and searchable my query is a simple one i have no 2n5551 transistors on hand and i want to see if one in my box will do the job. Transistor semiconductor history texas instruments rca bell laboratories western electric general transistor fairchild tungsol sylvania mullard philips stc newmarket general electric philco gec motorola shockley faraday willoughby smith william adams richard day charles fritts braun schuster henry round jagadis bose greenleaf pickard alan wilson walter schottky boris davydov nevill mott.
There is no listed equivalent to the af118 and where replacement is needed for an old transistor tv, it may be necessary to rejig the circuit to take a suitably rated silicon device. Apr 05, 2008 i during 80s and 90s, i used to search for components equivalents in books. Everyday low prices and free delivery on eligible orders. High voltage 75v video amplifier for transistor tvs. Philips described its pointcontact transistors in general terms as follows. Cross reference universal transistor reference page 1 eevblog electronics community forum. Transistor pnp germanium 32v 1a to1 medium driver order for or more ship same day or within 48hrs. Cross reference universal transistor reference page 1. Transistor equivalents for the substitution of modern. The image shows the oc71 glass case, painted black, with below it the oc72, a higher power type, achieved by slipping an aluminium can over the glass tube. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by adrian michaels isbn.
This section contains free e books and guides on transistor circuits, some of the resources in this section can be viewed online and some of them can be downloaded. For the pointcontact transistor a small slab of ntype germanium consisting of a single crystal and having a volume resistivity of 5. Vintage mullard semiconductors andrew wylies watercolours pages. Overall number of data sheets in free reference books we offer is over 20,000. Others, discontinued transistor data book 1975, scan, pdf.
When the transistor was announced by bell labs in 1948, two uk companies. If you continue without changing your cookie settings, well assume that you are happy to receive all cookies on our website. The cv7003 is a lowpower germanium pnp switching transistor equivalent to the gec type get874, the mullard type oc44 and the stc types tk31c and asy55. I show three examples, one in classic gec lowpower encapsulation, one in a mullard so2 glass can, and a third in a short so2 or to1 metal can probably made by texas instruments uk. In practice, the af125 can be used to replace af114115116. If not, it can usually be obtained from transistor data books. Does anyone know of a chart anywhere that list some of the common transistors you see in pinball circuit boards and their equivalent from different manufacturers. Choosing transistor replacements electronics notes. Free package of programs to work with pdf and djvu files can be downloaded here. In the 1950s and 1960s, hundreds of hobbyist electronics projects based around the ck722 transistor were published in popular books and magazines. Design and application of transistor switching circuits. Becoming an engineer supplier directory books events.
These can occasionally be found on ebay, usually advertised as germanium devices. Historical vintage mullard ocp71 phototransistors equivalent to. So called equivalent parts, or nte replacements, may not work at all in some cases, because they were worse in some spec, or the circuit was designed with the assumptions that the part had a fairly low bandwidth. I have an extensive collection of original data sheets and books, and can. The sound quality is good, and puts many of todays transistor radios to shame. Oc71 germanium transistor buy, price, stock, siliconark. The ac128 is a good generalpurpose replacement for oc71, oc78 and oc81. Maximum power, called p d, is the overall power a transistor can dissipate, through heat, without burning up. This book also has a very comprehensive glossary, index, and equations. Free transistor circuits books download ebooks online. Data on many transistors is available on my valve data cdrom. This easytouse book covers all transistor types including. In the spring of 1945 a major meeting was called to discuss the future research into them this was a pivotal point in the transistor history. The first germanium transistors that i encountered as a kid were the glassencapsulated ocxx types oc44, oc45, oc71, oc81d, oc81, etc.
Oc74 datasheet, equivalent, cross reference search. Aug 21, 2014 general electric transistor manual if that link goes away, you can sometimes find it for absurd. What books should one use to study mosfet, bjt transistor. Rca transistor thyristor and diode manual sc14 and a great selection of related books, art and collectibles available now at. The following diagram and paragraph are taken from the book electronic. Phototransistors are a form of transistor that is sensitive to light having the gain of a. Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown. Free transistor equivalent book transistor bipolar junction. The lead connections of the transistors are often included in the service data for the set.
As hostilities started to draw to a close, bell laboratories realised that there were major possibilities for semiconductor technology. Cross reference universal transistor reference read 980 times. Mullard data book, 19734, mister transistor and other websites see references. Hello everyone, ive just been flicking through a few old transistor applications books and noticed most if not all used pnp transistors and negative power supplys, however the vast majority of circuits ive seen in british electronics books from the 70s to 90s have almost always used npn transistors and standard power supplies. Pinball transistor equivalent chart, or how to read. They were designed as phototransistors, but as far as their use, they can be seen as oc71s without the black.
Tube oc 71 or rohre oc71 id33679, transistor, wires and audio frequency shown. International transistor equivalents guide bernard babani. Nte is a company that specializes in cross referenced parts. Used in some historical three transistors fuzzboxes like the marshall supa fuzz and some 2 transistors tone benders. Aug 25, 2011 crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Transistor equivalents for the substitution of modern transistors in elderly projects. Vrt comparison table for semiconductors from a to z.
Uk vintage radio repair and restoration bush transistor sets. One of the larger surfaces of this germanium slab is soldered on to a metal carrier and thus forms the base. Vrt comparison table for semiconductors from a to z edition. Other schematic diagrams and service manuals can be downloaded from our free online library on electronics. Is there any webbased or stand alone program to do such service for transistors and ics. They have a fourth connection, enabling the housing of the transistor to be connected to ground.
I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor. Mullard then developed a unique glass encapsulation, and in 1954 issued three new alloyjunction audiofrequency transistors, the oc70, oc71 and oc72. In this case, before fitting a replacement transistor, check the associated bias components. Introduction to the design of amplifiers, receivers and digital circuits 9 by amos, stan w. General electric transistor manual if that link goes away, you can sometimes find it for absurd. Imo, the 2 transistor books i got need a good instructor to clarify basic concepts like flow of electrons and holes, reverse bias, forward bias, etc. These three ocp71s are a bit of transistor history. The transistor handbook, one in a series of component handbooks, has the answers to all of your daily application questions. Or, point me to an article that explains transistor specifications and how to read them. They are very similar to the characteristics of a conventional bipolar transistor, but. Making a transistor radio parts list of course, if you had a time machine, you could visit the peter vis hardware mercantile store, and i will pack all of these items for you in a nice brown paper bag. Buy online discounted oc series transistors from silicon. Bipolar, power, rf, digital, igbt, unijunction, fet, jfet, and mosfets. A transistor is a semiconductor device with at least three terminals for connection to an electric.
This seems to affect many audio transistors including oc71, oc78, oc81, ac127, ac128, ac176, ac187 and ac188. The set is built on an aluminium chassis with the transistors, if cans, transformers and larger capacitors on top, and the smaller components underneath. The tr55 was quite similar to the regency tr1 in many ways, being. Still, to me transistors are very technical i need a transistor book that is about 8th grade level with more diagrams. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. These models are very fragile, sensible to static electricity, and therefore to avoid. A vintage ocp71 phototransistor this was an oc71 transistor with opaque encapsulation. This is where you will find all the transistors specifically in the oc series i.
Semiconductor cross reference book engineers of howard w. Jul 21, 20 ive just been flicking through a few old transistor applications books and noticed most if not all used pnp transistors and negative power supplys, however the vast majority of circuits ive seen in british electronics books from the 70s to 90s have almost always used npn transistors and standard power supplies. Dont go for a transistor with a much higher ft as this may increase the risk of oscillation. Articles transistors in vintage radios marks pages home. Ive quoted figures from a mullard data book published in 1979. Uk vintage radio repair and restoration transistor faults. The best equivalent transistors are the af12x series that are the same piece of germanium, but mounted in a to72 case.
Rangemaster treble booster clone, freaking awesome. Uk vintage radio repair and restoration transistor. Oc71 datasheet, cross reference, circuit and application notes in pdf format. Mullard soon switched to using the bc prefix for silicon, and ac for germanium, eliminating the confusion.
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