Mullard magic stocks vintage radio, military radio like r1155, t1154, ws19, military spare parts, valves, tubes by gec brimar mullard ecc83 kt66 ecc32 u52, radio components early wireless, vintage radio, domestic vintage radio, old technology of all kinds. They are of particular interest to hams building tetrode amplifiers, which have more complicated biasing circuits than grounded grid triodes. 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. Some tubes may show faint marks from the socket in our testing equipment. External anode tetrode electrically identical to 4x250b. Full tesla multilanguage data sheet is here in pdf form. If the air is not flowing thru the cooling fins, the heat from the filament alone is enough to damage the seals on them, resulting in a dud tube. The plate circuit in this amplifier will be quite a shocker to the current generation. A condensed semiconductor brochure is also available upon request. Referring to the picture of the eimac 4x250b plate curves which is the electrical equivalent to the 4cx250b my goal was to test the tube with it dissipating roughly half its rated 250 watts which then would heat the tube enough to show up any grid current problems and also provide useful gain and plate current. Mechanical data dimensions base as shown in figures 6 and 7 b8f note 2 mounting position unrestricted net weight 4x250b 4cx250b note 2.
Ian white, gm3sek, sells kits for tube control and protection. To put item to basket click on the basket picture or price. 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. Some datasheets are only one page 3050k, some are 810 pages 300k and more. 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. 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. With the naming conventions of ceramic tubes, we can tell quite a bit about the unit without even looking at the data sheet. An 829b dual beam power pentode cw transmitter don huff, w6jl. The following list shows tube types i have entered so far in my database. These were often used for driver tubes in fm broadcast transmitters. With almost datasheets and the visitor counter indicates over 4000. 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. Rca receiving vacuum tube and transmitting tubes technical manual book 4 vintage. The tube is externally identical to the 4cx250b but.
Longer life 4x250b, a new, superior radialbeam power tetrode by, other design improvements, make the 4x250b considerably easier to cool than the 4x1 50a. High ratio of transconductance to interelectrode capacitance and a 250 watt plate dissipation rating make the tube ideal for wideband amplifier applications. 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. Tube 4cx250b or rohre 4cx250b id18711, transmitting tetrode, air cooled, special tubebase in general and uhf shown. The 72034cx250b is designed to operate with a heater voltage of 6. If the air is not flowing thru the cooling fins, the heat from the filament alone is enough to. The tube is externally identical to the 4cx250b but contains rugged internal construction. Most are 4x250b tubes, they are the same as 4cx250b but have a glass bottom seal, otherwise.
I will go through my hickok crossreference directory tonight and see if any of the above are listed. Seal, plate dissipations, the blower horsepower requirement of the 4x250b is onehalf that of the. 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. The limit is the place what begins a small arching on tube g1. If so, i will attempt to determine any other tubes with the same settings that are more commonly known. Technical data the 72034cx250b and 86214cx250fg are ceramicmetal forcedair cooled, externalanode radialbeam tetrodes with a maximum plate dissi pation rating of 250 watts and a maximum inputpower rating of 500 watts. 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. 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.
Spheres vacuum tube page sphere research corporation. The limit is the place what begins a small arching on tubeg1. Document in this file telefunken tube data book display devices in this document. Rca receiving vacuum tube and transmitting tubes technical manual book 3 vintage. Serial data length is 14bit 4bit address and 10bit data. Vt127a data sheet 1947vt127a, vt127a, vt127a ei3021cj data sheet ei3021cj, ei3021cj. Philips valve data book, philips electrical industries, 6973 clarence street sydney, radio valve application division, 1958. Da eries f vrefh ao1 ch1 8ch10ch da converters bu250. If the page is blank click here rca 6fq7 6cg7 datasheet. The secret lies in the use of 4x250b tubes and a germaniumdiodes power supply.
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. Dieters nixie tube data archive this file is a part of dieters nixie and display tubes data archive if you have more datasheets, articles, books, pictures or other information about nixie tubes or other display devices please let me know. So, having in hand a few of these wwiiera tubes and some matching sockets acquired over the years, i decided to take. Someone may know exactly, but my information is that close to probably 6000 were. Tube 4x250b or rohre 4x250b id22532, transmitting tetrode, air cooled, special tubebase in general and poweroutput shown. Bill beech, nj7p has a tube database on his web site. The 807 is a beam tetrode vacuum tube, widely used in audio and radiofrequency power. Silver plated tubes may exhibit some silver tarnish which does not detract from performance.
Mar 23, 2015 referring to the picture of the eimac 4x250b plate curves which is the electrical equivalent to the 4cx250b my goal was to test the tube with it dissipating roughly half its rated 250 watts which then would heat the tube enough to show up any grid current problems and also provide useful gain and plate current results that could be compared to. The 4cx250b 7203 vacuum tube has a maximum plate dissipation rating of 250 watts and a maximum inputpower rating of 500 watts. Comprehensive transmitting tube data 1988 handbook base diagrams and data. Description of a 144 mhz high power amplifier for 2 x 4cx250b. Another spot to look, which is especially useful if youre looking for replacement types and tubes with similar bases or. Eimac 4x250b rf transmitting power tube pair for radio amplifier sealed nos.
I dont have necessarily data for all these types but i also have many data for types not listed. Try searching the tube data sheet locator, the worlds biggest index of tube datasheets other pages online with tube. Triodes 25t325a3 data sheet 194425t, 25t, 325a3 25t data sheet 195125t. Detailed data sheets on the various tubes listed in this catalog are available upon request. If you have never used this facility before, click the help link on the left for detailed instructions.
The following list shows the tube types i have entered in my database, with exception of the service types e. This 1960s sylvania 5r4gyb rectifier tube has a tall bottle, smooth black plates, and a side o getter. The 4cx250b 7203 is designed to operate with a heater voltage of 6. Welcome to the tube data sheet locator, a popular web resource for finding data on vacuum tubes. Then i guess that same book also references the 4x250b.
Use this if you just want a sheet for a particular tube. No, i dont want them, but be very careful lighting the filaments in them. In a few cases, when the 1966 edition omitted graphics on obsolete tubes, i inserted scans from the 1948 ginkins reference book. Rca receiving vacuum tube and transmitting tubes technical manual book 1 vintage. My revision book was printed in 1978, so anything after that wont be listed.