Articles transistors in vintage radios marks pages home. Full text of mullard data book 196566 internet archive. The sheets that never seem to turn up are the 60s commercial devices like oc4445, oc71, 81 etc. The datasheet states the maximum allowed output current and your design should limit its output current to less. The column marked case is the outline of the transistor case. Full text of data transistor characteristics tabulation. 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. In reality these two devices would be more accurately termed if transistors. Oc44 ad149 asz16 siemens transistor asy 27 af124 asz15 gd241 transistor gc301 ac125f. When the transistor was announced by bell labs in 1948, two uk companies were not far. Others, shortform transistor datasheet guide, scan, pdf. Delivery times for other countries and shipping methods can be found on our shipping information page. Mullard radio ic chip 14 dil dip details datasheet archive gf37c.
High voltage 75v video amplifier for transistor tvs. Mpsa44 npn highvoltage transistor nxp semiconductors. Germanium transistors the following table lists the parameters for germanium transistors. Comparison of germanium bipolar junction transistor. Oc44 datasheet, equivalent, cross reference search. I have a rangemaster type guitar pedal circuit that uses the oc44 germanium transistor. Also in 1956, mullard announced the oc44 and oc45 transistors, the latter. A firm i worked for retired its development lab i won a decent quantity of data books, including a few old mullard ones. 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.
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. Please consult the most recently issued document before initiating or completing a design. I get datasheets from your circuit design determines the output current. C2073 datasheet vceo 150v, npn power transistor mospec. The transistor q2 generate a radio frequencies rf in form of the colpitts oscillator circuit. Buy online discounted oc series transistors from silicon.
Buy texas instruments 2n388 price, stock, datasheet. C875 datasheet, c875 pdf, c875 data sheet, c875 manual, c875 pdf, c875, datenblatt, electronics c875, alldatasheet, free, datasheet, datasheets, data sheet, datas. 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. Free packages are available maximum ratings rating symbol value unit collector. This is where you will find all the transistors specifically in the oc series i. This remarkable photograph shows an oc44 that was found in a radio at. Oc44 datasheet, cross reference, circuit and application notes in pdf format. Tube oc 44 or rohre oc44 id33607, transistor, wires and frequency converter shown. Bf 109 the bf109 is a video output transistor manufactured by the silicon mesa. They are much more reliable and less noisy than af115116 and better performing than oc44 45. Diode test using a multimeter how to test a transistor with a multimeter. Vintage mullard semiconductors andrew wylies watercolours pages. Transistors are in stock with sameday shipping at mouser electronics from industry leading manufacturers. Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown.
Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical. Of course you need the datasheet of the transistor to design a circuit using it. Mouser is an authorized distributor for many transistor manufacturers including diodes inc. Tube oc 45 or rohre oc45 id33673, transistor, wires and rfifstage shown. Buy online discounted oc series transistors from siliconark. Pdf oc169 350iu oc171 oc171 oc44 oc169 oc45 transistor oc44 2s60a the transistor manual 2sa ge transistor manual. This diagram shows the lead connections for the mullard transistors most often encountered in british transistor radios made in the 1960s viewed from underneath. Bc372, bc373 high voltage darlington transistors npn silicon features pb. These models are very fragile, sensible to static electricity, and therefore to avoid. Xray view of germanium transistors oc44 mullard black glass. Each one of these builds has as its most prominent feature the oc44. For the pointcontact transistor a small slab of ntype germanium consisting of a single crystal and having a volume resistivity of 5. One of the larger surfaces of this germanium slab is soldered on to a metal carrier and thus forms the base. They have a fourth connection, enabling the housing of the transistor to be connected to ground.
Pnp transistors just to see how they sound instead. A description of the sites history is available on the web 14. Cases gec mazda stc aei hivac newmarket texas transistors. Applies to shipments to germany with our standard courier service dhl when paid via paypal, credit card or lastschrift. 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. Silicon npn epitaxial planer transistor, un42 datasheet, un42 circuit, un42 data sheet. C2073 datasheet vceo 150v, npn power transistor mospec, 2sc2073 datasheet, c2073 pdf, c2073 pinout, c2073 data, c2073 crcuit, output, c2073 schematic. I dont know much about transistors though so i am just wondering if there is a modern production oc44type transistor out there. 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.
Somewhere i have a couple of data booklets with the likes of af116117118 etc, but the data given is minimalist to say the least. 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. Emitter voltage bc372 bc373 vceo 100 80 vdc collector. Mullard data book, 19734, mister transistor and other websites see references.
Simple fm radio circuit using a single transistor last updated on february 23, 2020 by swagatam 173 comments when it comes to making an fm receiver its always thought to be a complex design, however the one transistor simple fm receiver circuit explained here simply shows that it isnt the case after all. Af124, af125 these are later models in metallic to1 long box. Toshiba transistor silicon pnp epitaxial type pct process 2sc1959 audio frequency low power amplifier applications driver stage amplifier applications switching applications excellent hfe linearity. For more crystal radio circuits, simple one transistor radios, and more advanced low transistor count radios. Ac122 datasheet germanium small signal transistors. Panasonic, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
For the radio constructor we have an archive of vintage circuits schematics to build. Others, discontinued transistor data book 1975, scan, pdf. Also, can i experiment with substituting any nongermanium silicon. 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. There is a transistor q1 act as increase the audio signal af from the crystal microphone and a resistorsr3 that limit amplitude of sound signal is increased by q1. Oct 22, 2010 of course you need the datasheet of the transistor to design a circuit using it. The to7 encapsulation has a 4th lead that is connected to the metal can, and this is usually connected to ground so that the transistor inside is screened. 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.
Universally useful and adaptable, the transistor is an essential component of electronic circuitry. These can occasionally be found on ebay, usually advertised as germanium devices. Toshiba transistor silicon npn epitaxial type 2sc2878. The diode test using an analogue multimeter can be extended to give a simple and straightforward confidence check for bipolar transistors. Now scrape the black paint off that oc44 and install an led on a dimmer pot next to it so you can add light as a factor in your designs. Crystal radio with one transistor audio amplifier, basebias. Many of,the circuits in thij book make use of the ocl69 and a chapter o. Or if you know the transistor you need then simply type the first 4 or digits in the above search box. Uk vintage radio repair and restoration transistor faults.
When the transistor was announced by bell labs in 1948, two uk companies were. This simple am transmitter circuit include of many parts. The oc44 and oc45 used in early transistor sets tend to be reliable. One of my interests is restoring vintage transistor radios. Radio circuits practical analog semiconductor circuits. The case drawings are shown at the bottom of the page. My old data book collection page 4 all about circuits. Jul 05, 2017 c2073 datasheet vceo 150v, npn power transistor mospec, 2sc2073 datasheet, c2073 pdf, c2073 pinout, c2073 data, c2073 crcuit, output, c2073 schematic. Xray view of germanium transistors oc44 mullard black glass discussion in effects, pedals, strings. The following diagram and paragraph are taken from the book electronic classics written. They are much more reliable and less noisy than af115116 and better performing than oc4445. Philips described its pointcontact transistors in general terms as follows. Anyway, the problem with these transistors is not the germanium itself rather, its the package the transistors are mounted in.
Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. With the right biased voltage at the base, the transistor can be operated like a mechanical switch. Uk vintage radio repair and restoration transistor. For more crystal radio circuits, simple onetransistor radios, and more advanced low transistor count radios. Full text of data transistor characteristics tabulation 1962. Oc44 datasheet, oc44 pdf, oc44 data sheet, oc44 manual, oc44 pdf, oc44, datenblatt, electronics oc44, alldatasheet, free, datasheet, datasheets, data sheet, datas.
A silicon transistor may be used if the basebias resistor is changed according to the table. Jun 15, 2015 they have a fourth connection, enabling the housing of the transistor to be connected to ground. Choosing transistor replacements electronics notes. Oc44n datasheet, equivalent, cross reference search. Toshiba transistor silicon pnp epitaxial type pct process. While silicon transistor by the nature have much more gain. Valve tube and transistor with informationprojects and technical help. Transistor products advertising for the new x78 in the january 1954 edition of electronics editorial in the june 1954 edition of electronics identified this transistor as the x78 a pnp alloy junction type for use in class b audio output amplifiers requiring an output of 2 watts. Data on many transistors is available on my valve data cdrom.
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