The 3cx1500a7 is a power triode, designed for use as a cathode driven class ab2 or class b amplifier, in audio or rf applications including the vhf band or as a cathode driven plate modulator class c rf amplifier. The 3cx1500a78877 power triode is designed for use as a cathode. Eimac varian yu101 water cooled ceramicmetal power triode. Maximumratingstypicaloperation classoftypeofserviceplateplate datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. These are 3cx1500 tubes designed for grounded grid operation. In addition, groundedgrid operation is attractive since a power gain as high as 8164 3ioooz highmu. The e imac 3cx800a7 is a cmpact power tr lode intended for use as a cathodedriven class ab2 or class b ampl i fier in r f appl i cat ions including the vhf band. Eimacvarian yu101 water cooled ceramicmetal power triode. Henry used greenstone exclusively in the last 7 seven years of their amplifier production and for replacement in all amplifiers. The eimac 3500z is a compact power triode intended to be used as a zerobias classab2 amplifier in audio or radiofrequency applications. Pdf 3cx1500a78877 3cx1500a78877 gs\carolyn\desktop\objects\3cx1500a78877 3cx1500 3cx1500a7 eimac 3cx1500a7 8877 tube 3cx1500a7 3cx1500a filament eimac 3cx1500a7 8877 eimac 8877 vhf linear amplifier. Yu158s are 8877 tubes that are specially selected for medical usage.
As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion and high amplification factor combine to make drive requirements. The max8877max8878 lownoise, lowdropout linear regulators operate from a 2. The eimac 3500z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radiofrequency applications. Free copies of the data sheet may be obtained upon request to. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion and high amplifica. Here is some data on the power triodes that might be usable by amateurs for radio projects.
If the amplifier filament transformer only produces 5 volts, it may reduce the life span of the yc257 since the. The companys first products were transmitting tubes with the high performance and stable design features that were required by the ham radio community. We no longer carry, nor do we recommend eimac tubes. While the 8877 is a good tube with excellent im characteristics and very high gain, it is probably the more problem plagued tube eimac manufactures. Was in working service 2009 but has been sitting around since. The eimac 88773cx1500a7 is a rugged ceramicmetal power triode designed for use as a cathode driven class ab2 or class b amplifier, in audio or if. I purchased the plate lines and output tuning capacitors as a kit from harry, wa4ofssk. Cpi eimac is a leading manufacturer of power grid tubes covering a wide range of applications including broadcast, industrial and scientific. Vtg eimac varian 5500 electron vacuum tube ham radio radialbeam power pentode.
Generally speaking, the mechanical aspects of the construction are more difficult to handle than the electrical ones. The rf parts 3500zg transmitting tube is the highest quality transmitting tube that money can buy, for decades rf parts has been testing 3500z tubes, and we only sell the best 3500zg that pass our tube testing. The 8877 3cx1500a7 is primarily used in broadcast applications. Electronic parts and equipment that was manufactured in the united states as early. Ina118 precision, lowpower instrumentation amplifier. The pr series tubes were pulserated, so the anode structure can withstand slightly higher anode dissipation power, but are otherwise identical to the standard 4a. The design follows the classic w6po design which is described in the eimac notes. A twokilowatt amplifier using the eimac 8877 triode one of the easier projects for the amateur to undertake is the construction of an amplifier for use on the hf bands. I had always admired an eimac high powered vacuum tube spoof data sheet put out by eitelmccullough,inc. These are exactly the same as sk300a but grid and screens are bypassed with twelve ht58 size doorknob caps, all silver plated. Triodes 25t325a3 data sheet 194425t, 25t, 325a3 25t data sheet 195125t 35t data sheet 193535t 35t data sheet 193635t. For 65 years, the eimac name has been synonymous with quality.
Cpi, eimac division is a world leader in the design and manufacture of gridded vacuum electron devices. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. Eimac 8875 amplifier tubes dentron mla radiparaccessori. Excellent articles dealing with linear amplifier design and construction using eimac transmitting tubes, and other. Describe your experience with the eimac 3cx1500a78877 and tell us why you give it the rating you did required. However, eimac s quick reference guide shows the 8938 to be known as the 3cx1500c7 too, as always, data on this site is probably not the latest, but i hope it is better than the usual ham tactic of guessing at values. Designers of new equipment are urged to contact eimac to get information on the range of the more important tube characteristics. Operation with zero grid bias simplifies associated circuitry by eliminating the bias supply. Marketing department, cpi, eimac division, 301 industrial road, san carlos, ca usa, 94070 or check eimac s web site.
This catalog is intended for use as a guide in selecting the right eimac product for your application. I wouldnt say the 3cpx1500a7 is any tougher than the 8877 as it still has to run within its dissipation parameters. I have found through testing over 20 8877 s and 16 yu158s with date codes from the late 1980s to the mid 1990s all new tubes that the power output of all 36 tubes was within 6% between best and worst, but the grid current was 10% less in the yu158s. We have had good performance from greenstone tubes. Sometimes a link is provided to a short summary on eimac s web site. The filaments are warmed up for three minutes before high voltage is applied. Ptt line protection is lost in the manual of phenolic stock.
And, as with any construction project, acquiring the parts. Eimac power grid tube quick reference data sheet page 1 of 2 3cx1500a7 8877 the eimac 3cx1500a7 8877 power triode is designed for use as a cathode driven class ab2 or class b amplifier, in, 12292008 eimac. I saw it when i was a teen ham operator and must have memorized it. Overvoltage protection product folder order now technical. Cpi mpp division, eimac operations, 607 hansen way, palo alto, ca 94303. The 3cx0h7 vacuum tube is a high mu power triode is intended for use as a zerobias class b amplifier in audio or rf amplifier, cw or modulated. The 3cx1500a7 8877 power triode is designed for use as a cathode driven class ab2 or class b amplifier, in audio or rf applications including the vhf band or as a cathode driven plate modulator class c rf amplifier. Where possible, eimac data sheets are provided, as eimac tubes are used by so many hams. Cathode driven rf linear amplifier, 3cx1500a7 datasheet, 3cx1500a7 circuit, 3cx1500a7 data sheet. Richardson electronics is proud to be the exclusive global distibutor for. Rf parts, an americanowned company in the usa has recently initiated new policies, regarding the export of our limited, vintage or rare electronic products. High power transmitting tubes, 3500c, 8877, 3cx1200a7. Ina101 datasheet, ina101 pdf, ina101 data sheet, ina101 manual, ina101 pdf, ina101, datenblatt, electronics ina101, alldatasheet, free, datasheet, datasheets, data. Cpi, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
Bob alper, w6kt article as first appeared in communications quarterly magazine, summer 1996 modification allows for economical tube substitution there are many dentron mla2500s out in the world. Lownoise, lowdropout, 150ma linear regulators with 2982 pinout. As a linear ampl ifier, high power gain may be obtai ned without sacrifice of low intermodulation distortion characteristics, low grid interception and high ampl i. Mar 30, 2012 eimac amateur service newsletters as1 through as50 all that were published. A two kilowatt amplifier using the eimac 8877 triode. If you look on the last footnote on the 25120 data sheet, i had included, due credit to eimac for inspiration. The 3cx15,000 a7 is a highmu power triode intended for use as a zero bias class b rf amplifier or class c power amplifier or oscillator. Varian eimac eimac application note 4 fc77 y678 1803ab m 8942 a ma2600 varian oeimac text. The eimac 88773cx1500a7 is a rugged ceramicmetal power triode designed for use as a cathode driven class ab2 or class b amplifier, in audio or rf applications including the uhf band, or as a cathode driven plate modulated class c rf amplifier. Eimac amateur service newsletters by hong lii issuu. The 8877 3cx1500a7 is an fac triode manufactured by cpi eimac. Eimac power grid tube quick reference data sheet page 1 of 2 3cx1500a7 8877 the eimac 3cx1500a7 8877 power triode is designed for use as a cathode driven class ab2 or class b amplifier, in, 12292008 eimac power grid tube quick, eimac division should.
All structured data from the file and property namespaces is available under the creative commons cc0 license. The failures and problems are actually why mri equipment in the 80s and early 90s quickly moved away from 8877 s. The eimac 88773cx1500a7 is a rugged ceramicmetal power triode designed for use as a cathode driven class ab2 or class b amplifier, in audio or rf. A s those of you who do expeditions and mountaintop contest ing can attestcarrying a kilowatt amplifier on your quest is so much fun. The products in this catalog are well suited for a wide variety of industrial applications.
Eimac highpower transmitters and klystrons the perham. This page describes the construction of a 1500watt 2m amplifier using an 8877. In both cases the maximum grid voltage was 10,000 volts. Eimac products are known for robust design and performance, long life, and value. The asb1 transmitter operated with with two eimac 15e triodes operating as a blocking oscillator at 515 mhz. Lownoise, lowdropout, 150ma linear regulators with 2982. Qro home made linear amplifier gateway i5uxj2 rosati. Look to eimac for continued quality and innovation in power grid vacuum devices. Sutherland, w6po high performance 144mhz power amplifier. The very short pulse duration, however, is defined in the data sheet, and must not exceed the average dissipation rating, averaged over time. In addition, groundedgrid operation is attractive since a power gain as high as. Typical output noise is 30vrms, and typical dropout is only 165mv at 150ma. Electronic parts and equipment that we will no longer be able to acquire. The classic information, on early rca tubes in particular, is bro.
Eimac catalog first page, datasheet, datasheet search, data sheet, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, semiconductors. In addition, groundedgrid operation is attractive since a. Over the years since 1987, i have built or modified five travel. Date codes for rcamade tubes ludwell sibley there is a sort of fascination with the date codes that are found on tubes. The 3cx1500a7 8877 power triode is designed for use as a cathode driven class ab2 or class b amplifier, in audio or rf applications including the vhf band as a cathode driven plate modulator class c rf amplifier. Someone may know exactly, but my information is that close to probably 6000 were. Eimac transmitting triode vacuum tube type 450t, circa 1941. The filament voltage of the 3cpx1500a7 is specified by eimac to br 5.
Files are available under licenses specified on their description page. Eimac power grid tube quick reference data sheet page 1 of 2 3cx1500a7 8877 the eimac 3cx1500a7 8877 power triode is designed for use as a cathode driven class ab2 or class b amplifier, in, 12292008 eimac power grid tube quick, eimac division should be consulted before using this information for final equipment design. The three types differ only in method of cooling and anode dissipation. Eimac 3500z pdf the original grounded grid triode introduced in the early s. They are indirectly heated tubes and are run in a parallel configuration.
As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion and high amplification factor combine to make drive. A twokilowatt amplifier using the eimac 8877 triode one 8877 or 3cx1500 2,080,841 bytes, pdf file arrl handbook 1978, pp. If the amplifier filament transformer only produces 5 volts, it may reduce the life span of the yc257 since the filament will be 10% lower than specified. These devices are pincompatible with the industrystandard 2982 and offer an improved dropout voltage. Cpi power grid devices eimac products eimac, now part of cpis microwave power products division, was founded in 1934 as eitelmccullough, inc. It is also recommended for use as a grounded grid fm amplifier. The 15e was designed for a maximum anode voltage of 15,000 volts when used as a pulse modulator or 12,500 volts when used in rf service. The eimac 81643 z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radio frequency applications. The tube is a variation of the 3cw1500a3 with a mounting flange. Mb8877a datasheet, mb8877a datasheets, mb8877a pdf, mb8877a circuit. Fujitsu floppy disk formatter controller fdc,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
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