Tube data should, therefore, be checked before replacing a type to be replaced in column 2 with a similar rca type in column 6. Offered tubes soviet marks as gu74b are made in the ussr at 198092 on this svetlana factory, are full analogue and have the best parameters rather modern sv. According to the eimac data sheet, at a plate voltage of 4000v, 420w is needed to drive the tube to 6030 watts output. The location where the rj45 cable connects your network to the power data box. The external dimensions of each compartment are 300 x 175 x 58 mm. As of 3505, i have finished scanning the general section, receiving tubes part 1, receiving tubes part 2, miscellaneous, specialpurpose receivingtype tubes, thyratron, ignitron, and glowdischarge tubes, and most of the transmitting tubes, as well as all. T1,2 2 x tube 4cx150a, 4cx250b, 4cx250r, 4cx250f, srl460, re025xa the air outlet is through a ptfe chimney on top of each tube. I want to tell you that i appreciate your time to disassemble and photograph the 4cx5000a tube. With almost datasheets and the visitor counter indicates over 4000.
Svetlana power transmitting tetrode the svetlana 4cx800a is manufactured in the svetlana electron devices sed factory in st. Capacitance values are for a cold tube as measured in a special shielded fixture in accordance. The kt88tk is a beampower tetrode that shares similar applications as the 6l6 and el34, and is one of the largest tubes in its class. A feature of this tube is the integral screencathode bypass capacitor. Intermodulation distortion the radio fre quency linear amplifier operating conditions including the distortion data are the results of actual operation in a neutralized griddriven amplifier. Etc1 vhf power tetrodes,alldatasheet, datasheet, datasheet search site for electronic. With the naming conventions of ceramic tubes, we can tell quite a bit about the unit without even looking at the data sheet.
Compare brands and shopping results for 4cx5000a hf amplifier schematic from. The 4cx15000j8910 is intended for use in audio or radio frequency applications. Where possible, eimac data sheets are provided, as eimac tubes are used by so many hams. The data should be used for basic information only. Two tubes can be employed under conditions listed in the first column to obtain more than five kilowatts plate output power. As data was collected from a number of sources, richardson electronics, ltd. Tube 4250a or rohre 4250a id246, transmitting tetrode, air cooled, uybase, 5 pins usa, april 1927 and shown. Sometimes there are major differences between the data on the different manufactuers data sheets you will need to resolve what is right. The screen terminal is a continuous ring which allows good isolation between the plate and the control grid circuit. Saw your article on the 4cx5000a tube, published in radio world this afternoon. These were often used for driver tubes in fm broadcast transmitters. Power tetrode 4cx20000a8990 short form specification plate dissipation max. The internal structure features a mesh filament and a mechanical design which assures good strength and high rf operations efficiency. I have one set new never used as spares along with the used set 4 total tubes.
It is particularly wellsuited for use in vhf fm broadcast transmitters in the band ii 88108 mhz frequency range. The 4cx1500a is recommended for use as a class c power ampli. Formal, controlled specifications may be obtained from cpi for use in equipment design. Vtg eimac varian 5500 electron vacuum tube ham radio radialbeam power pentode. Full ratings on the 4cx15000j8910 apply 110 mhz, and it is especially. The eimac 4cx5000a is a compact highpower ceramic and metal tetrode cooled by forced air. I have used these tubes since 1997 when i purchased the alpha 91b amp that used a pair of them for a 1500w hf amp, back then i had the use of portable spectrum analyzers and never found those tube to be dirty as far as imd, like any tube when you push them beyond there limits any tube gets dirty even the omg eimac tubes as. In a singleended circuit the loaded q should be at least 3.
Svetlana 4cx5000a8170 radial beam power tetrode t he svetlana 4cx5000a8170 is designed for audio and radio frequency applications. Triodes 25t325a3 data sheet 194425t, 25t, 325a3 25t data sheet 195125t 35t data sheet 193535t 35t data sheet 193635t 35t data sheet 194535t 35tg data sheet 194535tg 35tg data sheet 1955tg 50t data sheet 193450t 75t data sheet75t 75th data sheet 194475th 75th data sheet 195275th 75tl data sheet 194675tl 75tl data sheet 195275tl. Id1o20b rca interchangeability directory this interchangeability directory of industrial. Input circuit a resonant tank circuit is recommended for groundedgrid operation.
Top 4cx5000a hf amplifier schematic deals at mysimon. Polycom cx5000 system users guide getting started with unified communications conferencing with microsoft lync, microsoft office communicator 2007, and microsoft office live meeting, you can add a variety of communication modes to conference sessions, including phone, video, and even full web conferencing and data sharing with microsoft lync. These tubes share a common naming convention in which the first number identifies the number of elements contained within the tube. The 4cx300a is a compact power tetrode having a maximum platedissipation rating of 300 watts. The beauty of this is that a typical 100w pep plastic radio ham transmitter would drive it.
From an initial cold condition, tube operation will stabilize after a period of approximately 5 minutes. Data 4tx600a formerly x 2009 the 4c x600a is a compact radial beam tetrode with low lead inductances and low inter electrode capacitances, designed for use in distributed amplifiers and in uhf service up to 0 mc. This is the type of educational articles id like to see published more often in radio world. In the usual amateur use, its impossible to overload the 225w grid with a 100w pep transmitter. These three parameters define the overall electrical characteristics of a vacuum tube. The 4cx1500a is a general purpose tetrode for use up to and through vhf.
Mechanical application mounting the 3cx3000a7 must be mounted with its axis vertical. The 4a8166 is a radialbeam tetrode designed for use in radio transmitters. There are data sheets for the 4cx250b from eimac, stc and penta. Offered tubes soviet marks as gu74b are made in the ussr at 198092 on this svetlana factory, are full analogue and have the best parameters rather modern svetlana 4cx800a. Sometimes there are major differences between the data on the different manufactuers data sheets you will need to. The first number is indicates the number of grids in the tube, 3 makes it a triode, 4 tetrote and 5 pentode. This technique increases linearity and output power.
The original tube was the 4x5000a that was only rated at 30 mhz for full output and lacked the handles. The 4cx15000j8910 is a tetrode manufactured by cpieimac. The 1949 ge that was in service there for decades was converted to use 4cx5000as when the old glass tubes became hard to find, extinct might be a better word. Sometimes there is more than one data sheet, usually from different manufactuers. 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. The svetlana 4cx5000a8170 is manufactured in the svetlana. Provides the data and physical interfaces for connecting to an ethernet network, a pstn, and the polycom cx5000 device, as well as providing the power source for the polycom cx5000 device. The beauty of this is that a typical 100w pep plastic radio ham transmitter would drive it to 1436w. The gu74b 4cx800a svetlana tetrode is used in wideband nontunable amplifiers and for singlesideband power amplification in stationary and mobile rf equipment.
Likewise, three tubes can be utilized at conditions listed in the second column to obtain better than ten kilowatts output power. Df6na datasheets gu74b called 4cx800 by svetlana usa metalceramic transmitting power tetrode at frequencies up to 60 mhz. A vacuum tube has three important electrical parameters to measure mu voltage gain, gm transconductance and rp plate resistance. 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. Description of a 144 mhz high power amplifier for 2 x 4cx250b. The 4a is the largest of a series of tubes including the 465a, 4125a, 4250a, and the 4400a. The gu74b is fully equivalent to the modern 4cx800a tube. Insulation is ceramic and the thoriated tungsten filament is a rugged mesh design. Someone may know exactly, but my information is that close to probably 6000 were. Tube 4cx5000a or rohre 4cx5000a id49858, transmitting tetrode, air cooled, transmitterbase in gneral and shown. Eimac power grid tube quick reference data sheet page 1 of 1. Importance of these three parameters differs for triodes and pentodes. Eimac tube sockets and chimneys for 8877 3cx1500a7 3cpx1500a7 3cx800a7. Input and output anode compartment are made from 1 mm aluminium sheets.
The two tubes are electrically identical, though internally the. Load icom 7x00 7x6 ee element gu78b gu74b mp c sold 4cx3000a amp. I am working on scanning and placing on this page the entire rca hb3 tube manual. June 1975 optimistic, experiments conducted by the author indicate that if tank circuit conditions are approxi mately correct, efficiency is very good. The svetlana 4cx5000a 8170 has a directlyheated thoriated tungsten mesh. Here is some data on the power triodes that might be usable by amateurs for radio projects. The chimney has to fit tight on both tube and top cover. The ceramicmetal construction and the internally unitized electrode structure combine to make the 4cx300a especially durable and free from mechanically induced noise under conditions of severe acceleration caused by shock or vibration.
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