These can occasionally be found on ebay, usually advertised as germanium devices. Aug 25, 2011 crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. They were designed as phototransistors, but as far as their use, they can be seen as oc71s without the black. 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. Vrt comparison table for semiconductors from a to z. Buy principles of transistor circuits, ninth edition. This looks like the ubiquitous to18 package as used by the bc108 and similar but with a forth lead for the screen. The best equivalent transistors are the af12x series that are the same piece of germanium, but mounted in a to72 case. Should you find any info that can fill in any of the blanks in the matrix below.
Oc74 datasheet, equivalent, cross reference search. Bipolar, power, rf, digital, igbt, unijunction, fet, jfet, and mosfets. 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. Maximum power, called p d, is the overall power a transistor can dissipate, through heat, without burning up. Oc71 germanium transistor buy, price, stock, siliconark. Many times the equivalents shown in the various books are harder to find than the original component. Choosing transistor replacements electronics notes. Ive quoted figures from a mullard data book published in 1979. Still, to me transistors are very technical i need a transistor book that is about 8th grade level with more diagrams. If not, it can usually be obtained from transistor data books. Transistor equivalents for the substitution of modern. When the transistor was announced by bell labs in 1948, two uk companies. Or if you know the transistor you need then simply type the first 4 or digits in the above search box. I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor.
As hostilities started to draw to a close, bell laboratories realised that there were major possibilities for semiconductor technology. The transistor handbook, one in a series of component handbooks, has the answers to all of your daily application questions. This book also has a very comprehensive glossary, index, and equations. What books should one use to study mosfet, bjt transistor. A great book for learning electronics in easy plain language. 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. Philips described its pointcontact transistors in general terms as follows. 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.
Tube oc 71 or rohre oc71 id33679, transistor, wires and audio frequency shown. Is there any webbased or stand alone program to do such service for transistors and ics. Cross reference universal transistor reference page 1. Introduction to the design of amplifiers, receivers and digital circuits 9 by amos, stan w. Used in some historical three transistors fuzzboxes like the marshall supa fuzz and some 2 transistors tone benders. The following diagram and paragraph are taken from the book electronic. The best equivalent transistors are the af12x series that are the same piece of. Buy online discounted oc series transistors from silicon. Apr 05, 2008 i during 80s and 90s, i used to search for components equivalents in books. 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. Low power af amplifier transistors like the oc71 can be replaced with.
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. Articles transistors in vintage radios marks pages home. Vintage mullard semiconductors andrew wylies watercolours pages. Others, discontinued transistor data book 1975, scan, pdf. 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. Nte is a company that specializes in cross referenced parts. Transistor equivalents for the substitution of modern transistors in elderly projects. Mullard soon switched to using the bc prefix for silicon, and ac for germanium, eliminating the confusion.
Uk vintage radio repair and restoration bush transistor sets. General electric transistor manual if that link goes away, you can sometimes find it for absurd. Everyday low prices and free delivery on eligible orders. Free transistor equivalent book transistor bipolar junction. Cross reference universal transistor reference page 1 eevblog electronics community forum. If you continue without changing your cookie settings, well assume that you are happy to receive all cookies on our website. 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. Dont go for a transistor with a much higher ft as this may increase the risk of oscillation. A vintage ocp71 phototransistor this was an oc71 transistor with opaque encapsulation. Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown. 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. 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.
This seems to affect many audio transistors including oc71, oc78, oc81, ac127, ac128, ac176, ac187 and ac188. Uk vintage radio repair and restoration transistor faults. These three ocp71s are a bit of transistor history. The sound quality is good, and puts many of todays transistor radios to shame. Phototransistors are a form of transistor that is sensitive to light having the gain of a. In the 1950s and 1960s, hundreds of hobbyist electronics projects based around the ck722 transistor were published in popular books and magazines. Mullard data book, 19734, mister transistor and other websites see references. 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. These models are very fragile, sensible to static electricity, and therefore to avoid. 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. Semiconductortransistor crossreference list peavey. Others, shortform transistor datasheet guide, scan, pdf.
Semiconductor cross reference book engineers of howard w. Becoming an engineer supplier directory books events. 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. 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. The ac128 is a good generalpurpose replacement for oc71, oc78 and oc81.
Rangemaster treble booster clone, freaking awesome. Mullard then developed a unique glass encapsulation, and in 1954 issued three new alloyjunction audiofrequency transistors, the oc70, oc71 and oc72. The lead connections of the transistors are often included in the service data for the set. The first germanium transistors that i encountered as a kid were the glassencapsulated ocxx types oc44, oc45, oc71, oc81d, oc81, etc. Other schematic diagrams and service manuals can be downloaded from our free online library on electronics. Free transistor circuits books download ebooks online. For the pointcontact transistor a small slab of ntype germanium consisting of a single crystal and having a volume resistivity of 5. Does anyone know where the site is that you type in a transistor and get a list of equivalent transistor. Or, point me to an article that explains transistor specifications and how to read them.
Rca transistor thyristor and diode manual sc14 and a great selection of related books, art and collectibles available now at. This is where you will find all the transistors specifically in the oc series i. Heat sinks and fans increase the ability of a transistor to dissipate heat. Historical vintage mullard ocp71 phototransistors equivalent to. I have an extensive collection of original data sheets and books, and can.
Select a replacement transistor with equivalent ft. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by adrian michaels isbn. 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. Pinball transistor equivalent chart, or how to read. Some pages missing but still a useful source of info. Cross reference universal transistor reference read 980 times. Vrt comparison table for semiconductors from a to z edition. Uk vintage radio repair and restoration transistor.
Also as with any transistor set look for damage caused by leaking batteries. A transistor is a semiconductor device with at least three terminals for connection to an electric. Free package of programs to work with pdf and djvu files can be downloaded here. Aug 21, 2014 general electric transistor manual if that link goes away, you can sometimes find it for absurd.
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. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. In practice, the af125 can be used to replace af114115116. In this case, before fitting a replacement transistor, check the associated bias components. Transistor pnp germanium 32v 1a to1 medium driver order for or more ship same day or within 48hrs. One of the larger surfaces of this germanium slab is soldered on to a metal carrier and thus forms the base. Oc71 datasheet, equivalent, cross reference search. Another point to watch is that equivalent books list the af239s as a. The tr55 was quite similar to the regency tr1 in many ways, being. Overall number of data sheets in free reference books we offer is over 20,000. 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.
Buy online discounted oc series transistors from siliconark. They are very similar to the characteristics of a conventional bipolar transistor, but. They have a fourth connection, enabling the housing of the transistor to be connected to ground. International transistor equivalents guide bernard babani. 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. This easytouse book covers all transistor types including. Germaniumtransistoren by transistorvergleichsliste and a great selection of related books, art and collectibles available now at. Any replacement transistor of the same type, whether used or newoldstock, will. Design and application of transistor switching circuits. High voltage 75v video amplifier for transistor tvs. The links at left may help you to research your own replacement transistors.
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