Oc44 transistor equivalent software

Oc71, oc72, oc78 and oc81 have a similar basic construction. Also in 1956, mullard announced the oc44 and oc45 transistors, the latter. Williams oc44 ranger treble booster williams audio. Bipolar transistors database bipolar transistors database contain more than 46000 transistor data npn and pnp transistors. The secret to making these pedals sound good is biasing the transistor. Philips described its pointcontact transistors in general terms as follows. Look for something an npn transistor might be called an rf transistor, of course with similar or somewhat higher ft, similar or somewhat lower cob, and hfe in the same range to make it more likely it oscillates, and similar or somewhat higher pd, vceo, and ic to make sure it doesnt burn out. Oc44 ad149 asz16 siemens transistor asy 27 af124 asz15 gd241 transistor gc301 ac125f text. A to5 transistor with a p d of 3 watts might be able to dissipate 810 watts with a heat sink. Just a work of caution, many of the transistor equivalent documents and software packages have shortcomings and i am afraid to say that in many cases they have proved to be wrong. Ive seen this perhaps half a dozen times in the driver stage in the audio.

Hi, im currently repairing an amp with 2sb688a and 2sc5179 npn pnp complementary pair output transistors. Download ic database equivalent guide 100 thousand. Should you find any info that can fill in any of the blanks in the matrix below. Vintage mullard semiconductors andrew wylies watercolours pages. You are far better off understanding the specifications, particular those of particular interest to your application, and using a book or table of specs to find a proper substitute, or posting on sites like aac for help choosing.

In reality these two devices would be more accurately termed if transistors. In practice, the af125 can be used to replace af114115116. 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. Smallsignal transistors replacement list bc337a bc337 equivalent type bc338 bc337 bc33816 bc33716 bc33825 bc33725 bc33840 bc33740 bc36816 bc63516 bc36825 bc63516 equivalent type bc547a bc546a bc548 bc547 bc548a bc546a bc548b bc547b bc548c bc547c bc549 bc547b bc549b bc547b bc550 bc547b bc550b bc547b bc557a bc556a bc558 bc557 bc558a. High voltage 75v video amplifier for transistor tvs. Rangemaster germanium boost shootout different transistors. Apr 28, 2014 download bipolar transistors database for free. They are much more reliable and less noisy than af115116 and better performing than oc44 45. Each transistor is different, the voltage increases when the current increases and the voltage decreases when the temperature increases. The case drawings are shown at the bottom of the page. The ac128 sounds different but good in its own right. 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. Smallsignal transistors replacement list bc337a bc337 equivalent type bc338 bc337 bc33816 bc33716 bc33825 bc33725 bc33840 bc33740 bc36816 bc63516 bc36825 bc63516 equivalent type bc547a bc546a bc548 bc547 bc548a bc546a bc548b bc547b bc548c bc547c bc549 bc547b bc549b bc547b bc550 bc547b bc550b bc547b bc557a bc556a. Uk vintage radio repair and restoration transistor faults.

Oc44 ad149 asz16 siemens transistor asy 27 af124 asz15 gd241 transistor gc301 ac125f. For the pointcontact transistor a small slab of ntype germanium consisting of a single crystal and having a volume resistivity of 5. Sn76477 2n4401 free transistor equivalent book semiconductor data handbook mj802 2n3866 s2p tis43 bc149c xr2206 application notes lm1 siemens transistor manual text. The column marked case is the outline of the transistor case. Pinball transistor equivalent chart, or how to read. The oc44 and oc45 used in early transistor sets tend to be reliable. Physical model parameter optimisation for calibrated emulation of. Af124, af125 these are later models in metallic to1 long box.

Does anyone know where the site is that you type in a transistor and get a list of equivalent transistor. A good ac128 may sound much better than a bad oc44. Pnp transistors just to see how they sound instead. 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. Then a transistor with no series emitter resistor and its base biased at 0. I highly recommend the geofex article on the rangemaster. The original germanium transistor was the mullard oc44, long time ago discontinued. Others, shortform transistor datasheet guide, scan, pdf. Transistors substitutionsequivalents all about circuits. All the substitution books i have seen have been highly unreliable.

Once the transistor specifications and parameters have been ascertained, it is possible to check for other replacement transistor types with similar parameters that. The best equivalent transistors are the af12x series that are the same piece of germanium. Xray view of germanium transistors oc44 mullard black glass discussion in effects, pedals, strings. Obsolete transistor equivalents all about circuits.

Transistor equivalent electronics forum circuits, projects. This remarkable photograph shows an oc44 that was found in a radio at. These can occasionally be found on ebay, usually advertised as germanium devices. Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown. Dont go for a transistor with a much higher ft as this may increase the risk of oscillation.

Oc169 oc44 2s125 oc45 oc171 2s93 2sa42 2sa37 2sa70. 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. Transistor equivalents for the substitution of modern. They are claimed to sound good with a soft clipping knee but also noisy. Oc44 datasheet, equivalent, cross reference search. Dallas rangemaster treble booster circuit analysis electrosmash. Full text of data transistor characteristics tabulation. Semiconductor transistor, diode, ic cross reference. A ud io driver mullard mullard mullard mullard mullard oc171 r. When the transistor was announced by bell labs in 1948, two uk companies. Tube oc 44 or rohre oc44 id33607, transistor, wires and frequency converter shown. Kodi archive and support file vintage software community software apk msdos cdrom software cdrom software library console living room software sites tucows software library shareware cdroms software capsules compilation cdrom images zx spectrum doom level cd. Jun 15, 2015 they have a fourth connection, enabling the housing of the transistor to be connected to ground.

We currently have the oc75, oc71, oc9, and 2n4 available. Keep in mind that germanium transistors vary a good deal. I wont be going into any great detail as to how transistors are made or exactly how they work. In this case, before fitting a replacement transistor, check the associated bias components, coupling and. Ic cross reference cross reference ci stk cross reference ci tda cross reference ci sharp cross reference hitachi audio ic cross reference and circuit applications smd cross reference and equivalent we make every effort to ensure that the material on this site is accurate, however we do not warrant or represent that. Or, point me to an article that explains transistor specifications and how to read them. Looking for equivalent transistor electrical engineering. 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. They have a fourth connection, enabling the housing of the transistor to be connected to ground.

Dodgy ebay replacements are available but im aware that this is not necessarily the best route to go down. 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. Maximum power, called p d, is the overall power a transistor can dissipate, through heat, without burning up. 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. Also, can i experiment with substituting any nongermanium silicon. Tube oc 45 or rohre oc45 id33673, transistor, wires and rfifstage shown. Ac122 datasheet germanium small signal transistors. Located in montreal, canada, transistor software has been working with webtechnology since 1998. One of my interests is restoring vintage transistor radios. Heat sinks and fans increase the ability of a transistor to dissipate heat.

While silicon transistor by the nature have much more gain. Delivery times for other countries and shipping methods can be found on our shipping information page. Indium is a silvery metal, classed as a rare metal like germanium, and sufficiently soft to mark paper as do lead and graphite. I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor. Choosing transistor replacements electronics notes. Transistor semiconductor history texas instruments rca bell laboratories western. But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. Each one of these builds has as its most prominent feature the oc44. Bipolar transistors database contain more than 46000 transistor. The links at left may help you to research your own replacement transistors.

This pedal is a recreation of the original dallas rangemaster circuit, i use a genuine mullard oc44 pnp germanium transistor in this circuit, just like the originals. Select a replacement transistor with equivalent ft. Mullard soon switched to using the bc prefix for silicon, and ac for germanium, eliminating the confusion. Pc max ucb max uce max ueb max ic max ft max cctip pf hfe tj euro equivalent, usa equivalent, ussr equivalent, japan equivalent.

Bu515 can be replaced with bu508, because both are used in tv horizontal deflection section. 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. Although the software seems a bit ugly design running on dos, but it works perfectly with the database with many components and is free, makes an interesting tool to interested in electronics, want to know when information about a particular component or find a replacement. Transistor equivalent circuits and models learning objectives general dc equivalent circuit ac equivalent circuit equivalent circuit of a cb amplifier effect of source resistance r s on voltage gain equivalent circuit of a ce amplifier equivalent circuit of a cc amplifier smallsignal lowfrequency model or representation. Uk vintage radio repair and restoration transistor. They are much more reliable and less noisy than af115116 and better performing than oc4445. Cases gec mazda stc aei hivac newmarket texas transistors. Xray view of germanium transistors oc44 mullard black glass. Pc max ucb max uce max ueb max ic max ft max cctip pf hfe tj euro equivalent, usa equivalent. Germanium transistors the following table lists the parameters for germanium transistors. I dont know much about transistors though so i am just wondering if there is a modern production oc44type transistor out there. For general rf purpose around 250mhz use 2n3904 fast transistor, for audio use s9014 etc and for little more powerful audio etc, 8050 and 8550 are needed.

One of the larger surfaces of this germanium slab is soldered on to a metal carrier and thus. Mar 21, 2004 just a work of caution, many of the transistor equivalent documents and software packages have shortcomings and i am afraid to say that in many cases they have proved to be wrong. 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. Transistor equivalents for the substitution of modern transistors in elderly projects. The stac150v2350e is a high voltage nchannel mos fieldeffect rf power transistor especially designed for 150v industrial rf power class e generators such as pecvd plasma sputtering, flat panel and solar cells manufacturing equipments. 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. Oc42 datasheet, equivalent, cross reference search. Applies to shipments to germany with our standard courier service dhl when paid via paypal, credit card or lastschrift. I have a rangemaster type guitar pedal circuit that uses the oc44 germanium transistor. These models are very fragile, sensible to static electricity, and therefore to avoid. Look for something an npn transistor might be called an rf transistor, of course with similar or somewhat higher ft, similar or somewhat lower cob, and hfe in the same range to make it more likely it oscillates, and similar or somewhat higher pd, vceo, and ic to make sure it doesnt burn out package is up to you whether you want to try to duplicate it or not that one. Web and mobile experts transistor software provides premium web and mobile engineering, architecture and training to companies all over the world. One facet of the design process here at keeley electronics comes down to selecting not just the highest quality components for use in our pedals, but the right component for the sounds were trying to achieve.