A site dedicated for the am radio amateur and vintage radio. The problem with getting new hams to join the builder ranks is that there are not a great number of books that address this specific area. The following list shows the tube types i have entered in my database, with exception of the service types e. An 829b dual beam power pentode cw transmitter don huff, w6jl june 6, 2016 ive always thought of the 829b as a rather attractive tube physically ie, it has sex appeal. This amperex 4x150a tetrode power amplifier tube, looks to be in excellent condition. The limit is the place what begins a small arching on tube g1. Tube 4x150a or rohre 4x150a id12354, transmitting tetrode, air cooled, and uhf shown. Spheres canadian test equipment site contains an extensive inventory of all kinds of new and used electronic test equipment, service parts, bargains, electronic parts and other items. A condensed semiconductor brochure is also available upon request. Screen regulation is terribly critical and nearly never done correctly, particularly in articles of 1950s1960s vintage.
Eimac clean pullout limited quantity available no longer available for export. It would be interesting to hear from someone who was working on this tube back in the day. Precision didnt try to outdate the 1012 by limiting the number of tubes that it could test but, instead, constantly updated the tube data right up to the early 1960s. So, having in hand a few of these wwiiera tubes and some matching sockets acquired over the years, i decided to take. Pair eimac 3400z power amp amplifier linear tube test good with.
It was designed to be a light weight fairly compact amplifier. Another spot to look, which is especially useful if youre looking for replacement types and tubes with similar bases or characteristics, is the nj7p tube database. Valve data book 1951 franks electron tube data sheets. The 4x150a is designed to operate with a heater voltage of 6. All visual depictions displayed on this web site, whether of actual sexually explicit conduct, simulated sexual content or otherwise, are visual depictions of persons who were at least 18 years of age when those visual depictions were created. You can use the search to find service types or go to the service type lists that you can access from the page more tube related stuff. Pl8295pentap transmitting tube, pentode, pl8295 pl172 8295 8295a mfr. During its production period it was one of the smallest and lightest tube amplifiers on the market. If you have never used this facility before, click the. Precision electronamic tube master 1012 tube tester. Gu74b 4cx800a ceramic power tetrodes dxegu74b free. Eimac power grid tube quick reference data sheet page 1 of 1 4cx350a8321 the eimac 4cx350a8321 has a maximum plate dissipation of 350 watts and is intended for class ab audio or rf amplifier service. The grid is extremely delicate and not designed for current, but some eimac data shows a grid current of 1ma. With almost datasheets and the visitor counter indicates over 4000.
Eimac 4x150d vacuum tube silver plated external anode etsy. T the svetlana 4x150a7034 is a compact radial beam tetrode. Discussion in homebrew and kit projects started by n8agw, apr 28, 2014. The 866a is way oversized for most audio projects so the 816 is a good alternative if you must have that magic blue mercury glow. This tube does not come with its original patent notice or rectifier service report. The characteristics, grids and item breakdown paperwork are not included. About 500w 4x150a7034 tubevhf amplifier the resource is currently listed in in a single category. Home of the am pressexchange, the am forum the largest bbs of its kind,and the am classifieds, photos, audio, and technical information. Recent improvements in the 4x150a and 4x150d have allowed an increase in maximum platedissipation ratings for all class. The silver plated fins are contained in an outer ring, and in use air would be forced over the fins for anode cooling. By matt erickson kk5dr i have read in many articles, the lamentation over the lack of new hams that are building their own gear, and older hams who dont. Very useful for canadian companies, schools, and experimenters that need access to sophisticated, low cost electronics. The eimac 4x150d7035 is an external anode, tetrode 4 element vacuum tube designed in the early 1950s that was used in small transmitters and other radio frequency equipment. Typical operation data are based on conditions of adjusting the rof grid drive to a specified plate.
People tend to overload some of these pa high powered class b amps by connecting too many speakers, and the current change x voltage across the tube means they are likely to fail, often in this situation it is the fragile screens that heat up, glow red hot, and collapse inside the tube. The 816 is a smaller version of the 866a with less voltage and current handling capability. The maximum rated plate voltage for the 4x150a is 1250 volts, and the tube is capable of good. Detailed data sheets on the various tubes listed in this catalog are available upon request. We have general electric usa, not ukand rca recieving tube manuals for sale, as well as the rca transmitting tube manual tt4, and a book of data on western electric tubes. It is playing in the vacuum tube, such as 4cx250b and 4x150a d. It is part of a group that is supposed to be used and tested okay but i have no way to test them so i am offering a full satisfaction money back guarantee for this tube including domestic shipping costs. These were often used for driver tubes in fm broadcast transmitters. An 829b dual beam power pentode cw transmitter don huff, w6jl.
The 572b is an indirect descendent of the 811 tube. Try searching the tube data sheet locator, the worlds biggest index of tube datasheets other pages online with tube. Dx engineering gu74b 4cx800a ceramic power tetrodes are highperformance ceramic metal tetrodes with a plate dissipation rating of 800 watts. In addition to the data i have scanned and posted, if youre looking for data on a particular tube you should visit tsdl on duncanamps website, or franks tube data. Otherwise, the two tube types have identical characteristics. The eimac 4x150a and 4x150d tetrodes are compact power tubes intended for. It is intended for stationary and mobile equipment designs with power amplification at frequencies up to 500 mhz. Original nos vtg eimac varian sk510 tube socket for. Nov 25, 2016 the one feature, that i believe, makes the precision 1012 stand out among any other dynamic tube tester is the range of tubes that the 1012 can test. Tube 1lb4 or rohre 1lb4 id2811, vacuum pentode, loctal8, b8g sylvania, 1938 and poweroutput shown. Penta labs clean pullout 90 day limited over the counter warranty made in the usa. Compact 800w 4 tube linear using 4x150a tubes qrz forums. Typical operation data are obtained by calculation from published characteristic curves and.
Welcome to the tube data sheet locator, a popular web resource for finding data on vacuum tubes. The eimac 4x150a 4x150 7034 vacuum tube is used in broadcasting equipment. Tube data should, therefore, be checked before replacing a type to be replaced in column 2 with a similar rca type in column 6. Collins 75a4 new 26 piece capacitor replacement kit. The semiconductor manual contains detailed data concerning amperex tran. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. With the naming conventions of ceramic tubes, we can tell quite a bit about the unit without even looking at the data sheet. This link is listed in our web site directory since tuesday sep 15 2009, and till today 500w 4x150a7034 tubevhf amplifier has been followed for a total of 1277 times. The 4x150a is intended for class ab ssb linear rf amplifier service. An important clue to screengrid behaviour is found in the tube data sheets for rf transmitting power tubes. Get the best deals on eimac vintage tube sockets when you shop the largest online selection at.
The main category is amateur linear amplifiers that is about vhf linear amplifiers. The tube is externally identical to the 4cx250b but contains rugged internal construction. Radwell international datasheets for vacuum tubes vacuum tubes are electronic components used to amplify, switch, modify andor create analog signals by controlling the movement of electrons in lowpressure spaces. Also the book states that the transconductance at 200 ma is 12,000 so this was an obvious useful point to test the tube. Herein you will find a collection of vintage engineering texts, vacuum tube datasheets, and other obsolete information, presented free of charge and without annoying advertisements. Here it will be seen it is common for a particular tube type that the screengrid voltage is expressed at a constant value, irrespective of plate voltage. The 4x150a is to operate with a heater voltage of 6.
Maybe as manufacturing process for the 4x150a tube increased and people used more and more voltage on it, over the years they raised the ratings. Eimac 327a vacuum tube wwii era us navy uranium glass eimac jan 5d224250a vacuum tube large glass by leedsradio eimac 3400z vacuum tube mint condition ancestor of 3500z eimac 4125a vacuum tube by leedsradio on etsy early eimac 100th vacuum tube vt218 transmitting tube vacuum tube. The 4cx150a beam tetrode is a close relative to the 4cx250b vhfuhf rf power output valve and has the same finned anode structure. Building your own tube type hf amplifier, doing it the right way. Eimac nos no longer available for export made in the usa. Free copies of the data sheet may be obtained upon request. This rating may be exceeded for brief periods during circuit adjustment without damage to the tube. Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. Amperex 4x150a tetrode power amplifier tube used nationwide. This collins new capacitor replacement kit includes the custom made, chassis mount multi value can, as well as the other new, modern capacitors you will need to bring your vintage collins radio up to specifications. By matt erickson kk5dr i have read in many articles, the lamentation over the lack of new hams that are building their own gear, and older hams who dont build anymore. What looks consistent is that the older the data sheet, the lower the 4x150a ratings.
If you have never used this facility before, click the help link on the left for detailed instructions. Vintage radio repair course nri how to manuals restore coils 90 volumes books cd. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. Various pdf files containing eimac tubes information.
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