Em343xl in regions of particularly high cultural andor atmospheric noise, the em343xl including increased transmitter power and a larger transmitter coil improves the signaltonoise ratio by a factor. The em343 includes connectors for an analog signal output, as well as an input which can be used with a rechargeable battery option. Winding data and area product for coaxial etd341711 coil former number of sections winding area mm2 minimum winding width mm average length of turn mm area product ae x aw mm4 type number 1 42. When pushed, el34 will produce wonderful quintessential classic marshall tone thats instantly recognizable. The unique response of the instrument in each coil position to conductive material at different depths in the earth gives the em34 3 a limited depth sounding capability. Hand selected and matched using precise equipment, they are ready to ship. With almost datasheets and the visitor counter indicates over 4000. We only accept via paypal and bank transfor payment. These specifications are provided asis, with no warranty of any kind. Lifespan of el34kt77 tubes steve hoffman music forums. Transmitter, receiver, 2 coils, 3 cables 10m,20m,40m the em343 is a fast, simple to operate, costeffective instrument for the engineering geophysicist, geologist and hydrogeologist alike and has been particularly successful for mapping deeper groundwater contaminant plumes and for groundwater.
The el34 was the 1952 successor to the very successful el37 and both share a high value of mutual conductance 11. In audio amps, el34 tube produces that signature velvetsmooth mids. The em34 is a dual shadow magic eye tuning indicator and was originally. Octal u f 6,3 v i f c a 1,5 a typical characteristic. Em34 mullard ukholland tuning indicator magic eye valve. Digital signal output, required for data collection with the dl600das70 system, is available as an option for all models of the em34 3. The first topology is the one used in the homebuilt tv receiver of my father, based on the latest reference design as used inside the radiobuizen lab i.
With the em71 is done with the transition indicators modern postwar 193945. The controlgrid of the triodeamplifier section is connected to a point where a negative control voltage dependent on signal strength is available, e. Forwardmodeling computer program for the inductive. Mullard describe this device as suited to both receiver tuning indication and test equipment null. The unique response of the instrument in each coil position to conductive material at different depths in the earth gives the em343 a limited depth sounding capability. Em343 data sheet the em343 is a fast, simple to operate, costeffective instrument for the engineering geophysicist, geologist and hydrogeologist alike and has been particularly successful for mapping deeper groundwater contaminant plumes and for groundwater exploration. According to the data sheets found in old vacuum tube reference manuals, a pair of el34s with 800 v plate voltage can produce 90 watts output in class ab1 in pushpull configuration. The svetlana 6l6gc is manufactured in the svetlana fact ory in st. Forwardmodeling computer program for the inductive electromagnetic groundconductivity method. Em34 3 data sheet the em34 3 is a fast, simple to operate, costeffective instrument for the engineering geophysicist, geologist and hydrogeologist alike and has been particularly successful for mapping deeper groundwater contaminant plumes and. This is the amalgamated data from three mullard data books from the late 20s to late 30s. General data 14pins etd341711 coil former winding data and area product for 14pins etd341711 coil former note 1. Nos tube specification sheet nos tube specification sheet. Valves still in production or stock for revalving are not listed here.
Out of the tube pile, i picked a 6jt8 and pulled up the datasheet on the tube. The eq40 and eq80 used in television receivers at this stage, it is interesting to explore how the eq80 fm detector application circuit developed over time. If you cant find what you need here, try duncans tube data sheet locator. Close manufacturing specification tolerances and improv ed processing provide improved reliability and superior sonic performance. In common with all e prefix tubes, using the mullardphilips tube designation, the el34 has a heater voltage of 6. The el34 specification and max ratings filament voltage. Use of these parameters shall be entirely at the users own risk. The other is the tube life is better when the tubes are stable in temperature. Exit from the logging session and access to field options are available only from the logging window in stand by mode. The grid voltage change is 0 5 volts and 0 16 volts.
Transmitter, receiver, 2 coils, 3 cables 10m,20m,40m the em34 3 is a fast, simple to operate, costeffective instrument for the engineering geophysicist, geologist and hydrogeologist alike and has been particularly successful for mapping deeper groundwater contaminant plumes and for groundwater. Em34 3xl in regions of particularly high cultural andor atmospheric noise, the em34 3xl including increased transmitter power and a larger transmitter coil improves the signaltonoise ratio by a factor. Six data points, used to develop two geometric sounding curves, are obtained by making measurements in both coil orientations at all three coil spacings. The svetlana 6l6gc is a glass envelope beampower tetrode intended for highpower audio amplifier service.
It is the onoff temperature and voltage swings that will wear the. Mullard describe this device as suited to both receiver tuning indication and test equipment null indications. The first topology is the one used in the homebuilt tv receiver of my father, based on the latest reference design as used inside the radiobuizen lab i mid1948. The 6e1p 6br5 em80 magic eye and other indicator tubes. Replacing the em34 by the 6e5c in many cases its possible to replace the rare and expensive eye tube em34 by the russian 6e5c 6e5s. This assembly broadening the scope of the tube, it becomes a truly active element of the receiver. We carry a huge selection of el34 6ca7 kt77 tubes for your amps. Em34 mullard british or holland nos tuning indicator magic eye in originalwhite box.
The radio valve data book, iliffe books ltd london 1966 mentions the em85 made by brimar as an obsolete type. 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. Vacuum tubes wear out due to heat and high temperature. Baltimore, md does anyone know if any other type of eye tube can be made to work in place of an em34. If the amp is operating at too high a voltage and the tubes are drawing too much current, then this is not true, but assuming that all is well in the amp, then letting them run doesnt do much harm. It has an international octal base indicated by the 3 in the part number and is found mainly in the final output stages of audio amplification circuits and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. Over the years i have amassed many tv tubes and many of these tubes are interesting because they contain many tube sections in one package. No problem, click below and enquire now to see if we can locate your product for you. Thanks to frank philipse for supplying the above pdf datasheet. Due to its narrower profile, el34 tubes can run quite hot and tend to. Em343 data will be displayed with the update rate approximately 10 readings per second, however data will not be saved in the log file and profile curves will be not updated. Parameter specification coil former material polybutyleneterephtalate pbt, glassreinforced, flame retardant in accordance with ul 94v0. The geonics em343 data logging system das70cx consists of a field computer allegro cx, data acquisition program em343, and associated cable to connect the allegro cx to the geonics em343 instrument any em343 model equipped with rt module.
El34 is one of the most popular power output tubes today, and there is a large number of current production el34 and variants. Em34 mullard ukholland tuning indicator magic eye valve tubes. Digital signal output, required for data collection with the dl600das70 system, is available as an option for all models of the em343. Notify me of updates to 6e5s 6e5c 6e5g 6g5g magic eye tube. Data from or other sources as supplied by john atwood. The em34 is a dual shadow magic eye tuning indicator. Vacuum tube 6cd7 em34, indicator, tuning electronray tuning indicator with triode unit and. A magic eye tube or tuning indicator, in technical literature called an electronray indicator tube. The el34 is a much loved audio power valve with an anode dissipation of 25 watts. The top of the envelope showing the bowl of the screen and the oxide coated cathode. Cifte en dario philips france produceerden een em34 met geelgroen lichtbeeld. This system is connected via a special conical connector system, which is joined together to a complete form fit by means of a copper hammer, creating optimal traction. Vacuum tube 6cd7 em34, indicator, tuning amplified parts. The 6e3p electronray valve has been designed to give visual indication of resonance in radio receivers for correct tuning.
El34 excels at reproducing horns and female vocals, with silky smooth texture. I believe it covers all the valves mullard made for domestic receivers between 1925 and 1937. The el37 was of pinch construction whereas for the el34 mullard used the pressed glass foot construction employed on the b9a and b7g miniature. Exit from the logging session and access to field options are available only from the logging window in stand by. Vacuum tube 6cd7 em34, indicator, tuning antique electronic. Only those valves in current production, with full or half page data are listed. Here youll find manufacturers data sheets and curves for many popular and some not so popular electronic valve types. A great sounding el34 amp is a joy to listen to all day. This 6e5c is an octalbase version of the american 6e5 with ux6 base.
My luck with eye tubes is about 5050 typically, but it seems to be a little worse with the em34 sets more like 8020. The em34 is suited to both receiver tuning indication and test equipment null indications. Antique radio forums view topic em34 tuning eye tube. The el37 was of pinch construction whereas for the el34 mullard used the pressed glass foot construction employed on the b9a and b7g miniature valves for this io based device. The em34 is also limited in its depth of interrogation to perhaps 30 meters the r60 resistivity system has been used to interrogate to almost 1 km and could have seen even more deeply if more wire had been available. Em34 3 data will be displayed with the update rate approximately 10 readings per second, however data will not be saved in the log file and profile curves will be not updated. The el34 is a thermionic valve or vacuum tube of the power pentode type. Output pentodeoutput pentode rated for 25w anode dissipation,ntended for use in a. Does anyone know if any other type of eye tube can be made to work in place of an em34. Net tube data here youll find manufacturers data sheets and curves for many popular and some not so popular electronic valve types. This means the unknowns layer thicknesses and conductivities that can be deduced from the em34 are 6 at most.
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