Ac122 datasheet germanium small signal transistors. Mullard soon switched to using the bc prefix for silicon, and ac for germanium, eliminating the confusion. But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. Mullard radio ic chip 14 dil dip details datasheet archive gf37c. Does anybody have any suggestions where i might get hold of some 2. Jun 15, 2015 they have a fourth connection, enabling the housing of the transistor to be connected to ground. Oc42 datasheet, equivalent, cross reference search.
Please consult the most recently issued document before initiating or completing a design. This chart shows the pinout and data for af114, af115, af116, af117, oc26, oc44, oc45, oc65, oc66, oc70, oc71, oc72, 2oc72, oc170, and oc171 transistors. 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. The best equivalent transistors are the af12x series that are the same piece of. These can occasionally be found on ebay, usually advertised as germanium devices. Tube oc 44 or rohre oc44 id33607, transistor, wires and frequency converter shown. These models are very fragile, sensible to static electricity, and therefore to avoid. The oc44 and oc45 used in early transistor sets tend to be reliable.
Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical. This remarkable photograph shows an oc44 that was found in a radio at some point in. Oc44 datasheet, oc44 pdf, oc44 data sheet, datasheet, data sheet, pdf. This remarkable photograph shows an oc44 that was found in a radio at some. Customize an aluminum enclosure to house your effect pedal with services such as drilling, powder coating, and uv printing. One of my interests is restoring vintage transistor radios. Xray view of germanium transistors oc44 mullard black glass. Mouser is an authorized distributor for many transistor manufacturers including diodes inc. Applies to shipments to germany with our standard courier service dhl when paid via paypal, credit card or lastschrift. My old data book collection page 4 all about circuits. Full text of mullard technical handbook book1 part1 transistors ac127 to bf451 september 1974 see other formats. Wherever you need to control the flow of electricity in a device from transistor radios, to diodes, to circuit boards you can find a great collection of transistors on ebay.
Germanium transistors the following table lists the parameters for germanium transistors. Mullard utilised a different convention to identify the pinout and often printed a dot on the side of the transistor. In this germanium triangle that is the royal blues oc44, you can pick which of your favorite fuzzes to own with a mullard oc44 in it. High voltage 75v video amplifier for transistor tvs. Oc44 datasheet, cross reference, circuit and application notes in pdf format. Toshiba transistor silicon pnp epitaxial type pct process. Do you know any nos replacement for this transistor with the same packaging.
Others, shortform transistor datasheet guide, scan, pdf. Easy pin identification one of the major problems in circuit design is the identification of pin connections of transistors, scr, triac, and similar devices. Uk vintage radio repair and restoration transistor. They are much more reliable and less noisy than af115116 and better performing than oc44 45. Anyway, i understand the concept of a transistor, how it can be used for switching and i have. Choosing transistor replacements when repairing a circuit, or even building a new one it is often not possible to find the exact electronics component we tell you how to choose a suitable replacement. After some time, and having most of the components and hardware i almost finished the board, but i cant find the 2g374 old pnp transistor used in the tremolo section. To get an idea about the pins, we have to search for the datasheet or other sources to complete the circuit connections. Tube oc 44 or rohre oc44 id33607, transistor, wires and frequency.
Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown. Oc44n datasheet, equivalent, cross reference search. Jul 05, 2017 c2073 datasheet vceo 150v, npn power transistor mospec, 2sc2073 datasheet, c2073 pdf, c2073 pinout, c2073 data, c2073 crcuit, output, c2073 schematic. The transistors used in are oc45 and oc71s ive got hold of the 71s, but am having real trouble trying to find a source for the 45s.
Oc44 datasheet, oc44 pdf, oc44 data sheet, oc44 manual, oc44 pdf, oc44, datenblatt, electronics oc44, alldatasheet, free, datasheet, datasheets, data sheet, datas. 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. Uk vintage radio repair and restoration transistor faults. They are very similar in practice indeed, according to the data presented in the classic.
Aug 21, 2003 helping him build a radio using the ladybird making a transistor radio book. Af124, af125 these are later models in metallic to1 long box. Delivery times for other countries and shipping methods can be found on our shipping information page. In practice this is less common on transistor sets because the adjustments are too small for the average bodger to get a terminal screwdriver into. Many of,the circuits in thij book make use of the ocl69 and a chapter. Universally useful and adaptable, the transistor is an essential component of electronic circuitry. If you think the set needs realignment, ask yourself why. Pedal parts plus has the finest effect pedal parts available for the boutique builder or diyer. Full text of mullard data book 196566 internet archive. Toshiba transistor silicon npn epitaxial type 2sc2878.
In practice, the af125 can be used to replace af114115116. Mullard data book, 19734, mister transistor and other websites see references. Oc71 datasheet, cross reference, circuit and application notes in pdf format. Also in 1956, mullard announced the oc44 and oc45 transistors, the latter.
Uk vintage radio repair and restoration transistor radio. Tube oc 45 or rohre oc45 id33673, transistor, wires and rfifstage shown. Picture right, an early version of the telefunken logo featuring the sparks funken associated with wireless of the time. Choosing transistor replacements electronics notes. I have an extensive collection of original data sheets and books, and can provide. I havent been able to find any datasheet for 2g374 transistors.
The case drawings are shown at the bottom of the page. Others, discontinued transistor data book 1975, scan, pdf. If not, it can usually be obtained from transistor data books. My electronics knowledge is getting better, i have been reading a lot, but i have lots of gaps and lack some basic knowledge, which im trying to pick up. Also in 1956, mullard announced the oc44 and oc45 transistors, the latter seems to be described all over the web as the first rf transistor, although i think this only applies to europe. Vintage mullard semiconductors andrew wylies watercolours pages. Somewhere i have a couple of data booklets with the likes of af116117118 etc, but the data given is minimalist to say the least. Nov 18, 2014 a firm i worked for retired its development lab i won a decent quantity of data books, including a few old mullard ones. Oc44 datasheet, equivalent, cross reference search. C2073 datasheet vceo 150v, npn power transistor mospec. The data book has been prepared by central technical services, mullard ltd. In reality these two devices would be more accurately termed if transistors. Full text of mullard technical handbook book1 part1. Each one of these builds has as its most prominent feature the oc44.
In the prehistory of semiconductors material science, karl ferdinand braun had discovered in 1874 that metal sulphides showed unidirectional conductivity. Transistors are in stock with sameday shipping at mouser electronics from industry leading manufacturers. The following diagram and paragraph are taken from the book electronic classics written by andy emmerson. Some pages missing but still a useful source of info. Of course, after 40 plus years of life, most electrolytic capacitors are suspect and the carboncomposition resistors have drifted high and sometimes become very noisy. Mpsa44 npn highvoltage transistor nxp semiconductors. The cause of death or fault mechanism is rather interesting. Articles transistors in vintage radios marks pages home. If someone has been fiddling with the adjustments, this is a good reason. The sheets that never seem to turn up are the 60s commercial devices like oc44 45, oc71, 81 etc. Cases gec mazda stc aei hivac newmarket texas transistors. Where you to open it up, you would find that the encapsulation surrounding the transistor contains silicone grease and an air space inside the metal can. Toshiba transistor silicon pnp epitaxial type pct process 2sc1959 audio frequency low power amplifier applications driver stage amplifier applications switching applications excellent hfe linearity.
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